BBK LD2006SI-2 Service manual

LD2006SI-2

service manual

LD1506SI-2 LD1506SI-3 LT1500S-2
LT1500S-3 LT2000S

LD1906SI LT1900S

Explanation to LD2006SI-2 derived machines

Model

Video

main

board

TV

button

board

Remote

control

receiving

board

USB

board

Headph

one

board

DVD

button

board

Power

board

Inverter

Conne

cting

board

Display

screen

Remark

LD1506SI

-2

21903-5 41903-0 B1506-0 D1903-1 H1903-1 J1903-0

Adapter

AK083-3

INV203-

2

SVA150XG

04TB 15"

TFT

Based on LD2006SI-2,

change display screen

to 15" screen, change

power board to adapter

and make the relevant

changes in video main

board

LD1506SI

-3

21903-5 41903-0 B1506-0 D1903-1 H1903-1 J1903-0

Adapter

AK083-3

INV203-

2

BOEHT150

X02-100
15" TFT

Based on LD1506SI-2,

change MST718BE to

MST718BU PQFP,

change the

manufacturer of display

screen

LT1500S-

2

21903-5 41903-0 B1506-0 H1903-1

Adapter

AK083-3

INV203-

2

SVA150XG

04TB 15"

TFT

Based on LD1506SI-2,

cancel DVD and card

read function

LT1500S-

3

21903-5 41903-0 B1506-0 H1903-1

Adapter

AK083-3

INV203-

2

BOEHT150

X02-100
15" TFT

Based on LD1506SI-3,

cancel DVD and card

read function

LD1906SI 21903-6 41903-0 B1903-1 D1903-1 H1903-1 J1903-0

Adapter

AK083-3

INV403

M190A1-

L02 19"

TFT

Based on LD1506SI-2,
change display screen

and the matching circuit

LT1900S 21903-6 41903-0 B1903-1 H1903-1

Adapter

AK083-3

INV403

M190A1-

L02 19"

TFT

Based on LD1906SI,

cancel DVD and card

read function

LT2000S 21903-5 41903-0 B1903-1 H1903-1

@52006

-2UL

INV607

G2006

SI-0

LC201V02-

SDB1 20"

TFT

Based on LD2006SI

2, cancel DVD and card

read function

LD2006SI

-2

21903-5 41903-0 B1903-1 D1903-1 H1903-1 J1903-0

@52006

-2UL

INV607

G2006

SI-0

LC201V02-

SDB1 20"

TFT

Adopt MST718BE+20"

TFT screen

LD2006SI-2 is a LCD TV with multiple functions. It adopts MST718 as main chip (MST718 has built-

in MCU and video processor). Video main board of this machine adopts 21903-X series PCB (only small

changes are made in PCB board numbers and service manual of LD2006SI-2 adopts the video main

board of 21903-5). This PCB integrates the circuit of DVD function and DVB function on video main

board. This PCB is widely used and there are many derived machines. Now we will introduce functions

and machine structure of several derived machines one by one. We list the following for readers to used

in order to know differences between each model.

List of Differences in Different Models

1. Introduction to LT2000S model

Based on LD2006SI-2, LT2000S cancels DVD/card read function, but other circuit and components

are totally the same with those of LD2006SI-2. Compared with LD2006SI-2 on the aspect of composition

of the player, LT2000S has no PCB components of USB board /DVD button board/video main board

(DVD function circuit is absent). As for working principle, we will not give any introduction, so please

refer to “LD2006SI-2 Service Manual”.

2. Introduction to LD1506SI-2 model

LD1506SI-2 is a 15” LCD TV, which changes display screen to 15” LCD TFT screen on the basis of

LD2006SI-2. According to parameters requirements, drive means and inverter components are

changed. Differences on video main board: 1) LD1506SI-2 adopts LVDS output means, while LD2006SI-

2 adopts TTL output means, so the peripheral circuit of LCD drive output part on MST718 has slight

difference; 2) 15” screen adopts 5V power supply, so IC702 is added to act as voltage stabilizing IC; 20”

screen adopts 12V power supply, so there is no need to add voltage stabilizing IC; 3) LD1506SI-2 adds

VGA input circuit according to design requirements to make the machine use as display; 4) LD1506SI-2

adopts adapter (AK083-3) to supply power, while LD2006SI adopts internal power board to supply

power, so power input end is added on video main board. Remark: as for inverter components and

power adapter working principle of this machine, you may refer to “LD1506SI Service Manual”; as for

video main board and other subsidiary board working principle, please refer to “LD2006SI-2 Service

Manual”.

3. Introduction to LD1506SI-3 model

LD1506SI-3 changes display screen and MST718 ob the basis of LD1506SI-2. The main

differences are: display screen is changed to BOEHT150X02-100 15” TFT screen; main IC MST718BE

is changed to MST718BU PQFP; other parts are totally the same. Please refer to “LD2006SI-2 Service

Manual” and “LD1506SI Service Manual” for details of working principle.

4. Introduction to LT1500S-2 model

LT1500S-2 cancels DVD function on the basis of LD1506SI-2 but other parts are totally the same.

Please refer to “LD2006SI-2 Service Manual” and “LD1506SI Service Manual”.

5. Introduction to LT1500S-3 model

LT1500S-3 changes display screen and MST718 on the basis of LT1500S-2. The main differences

are: display screen is changed to BOEHT150X02-100 15” TFT screen; main IC MST718BE is changed to

MST718BU PQFP; other parts are totally the same. Please refer to “LD2006SI-2 Service Manual” and

“LD1506SI Service Manual” for details of working principle.

6. Introduction to LD1906SI

LD1906SI changes display screen to 19” TFT screen on the basis of LD1506SI-2. Because of this,

boost components has alteration, that is, boost components are changed to INV403 (working principle is

the same with INV607 and you may refer to “LT2002S Service Manual). Display screen drive adopts

LVDS input method and other circuits' working principle is totally the same with that of LD2006SI-2.

During the course of servicing, please refer to “LD2006SI-2 Service Manual”.

7. Introduction to LT1900S model

LT1900S cancels DVD function on the basis of LD1906SI and other parts are totally the same with

those of LD1906SI. Please refer to “LD2006SI-2 Service Manual” for details of working principle.

Catalog

Chapter One About Maintenance

1.1 Safety precautions

1.1.1 Power supply

1.1.2 Precautions for antistatic

1.1.3 Precautions for display screen

1.1.4 Precautions for laser head

1.1.5 About placement position

1.2 Maintenance method

1.2.1 Electric resistance method

1.2.2 Voltage method

1.2.3 Current method

1.2.4 Element substitution method

1.2.5 Cutting method

1.2.6 Visualized method

1.2.7 Comparison method

1

1

1

1

1

2

2

2

2

2

2

2

2

3

3

1.3 Required device for maintenance

Chapter Two Functions and Operation Instructions

Section One TV SEGMENT

2.1.1 Features

2.1.2 Set list

2.1.3 CONTROLS AND FUNCTIONS

2.1.4 CONNECTION AND STARTING

2.1.5 TV MODE

Section Two DVD SEGMENT

2.2.1 Controls and functions

2.2.2 FUNCTION SETTINGS

2.2.3 OTHERS

3

4

4

4

5

5

7

7

9

9

9

12

Chapter Three Principle and Servicing

15

The previous manual: TV part

Section One Principle of the player

3.1.1 Function

3.1.2 Block diagram of the player

3.1.3 Function introduction to IC of the player

Section Two Unit Circuit Principle

3.2.1 System control circuit

3.2.2 Audio circuit

3.2.3 Video circuit

3.2.4 Input circuit

3.2.5 Power circuit

Section Three Servicing Cases

3.3.1 Servicing cases

3.3.2 Troubleshooting flow chart

Section Four

Waveform diagram

15

15

15

15

17

18

18

22

26

27

29

34

34

42

54

Section Five Function Introduction to IC

3.5.1 function introduction to SDRAM

3.5.2 function introduction to STV8216

3.5.3 function introduction to MST718

3.5.4 function introduction to Cd4052

3.5.5 function introduction to TDA7266D

3.5.6 function introduction to FSAV433

3.5.7 function introduction to HEF4094B

Section Three Servicing and Principle

The next manual: DVD part

Section One Principle of the player

3.1.1 Introduction to the player

3.1.2 Introduction to IC used by the player

Section Two Unit Circuit Principle

63

63

64

67

73

75

75

76

78

78

78

78

79

3.2.1 Introduction to laser head

3.2.2 Servo circuit

3.2.3 Laser power control circuit

3.2.4 CD/DVD conversion circuit

79

80

82

93

3.2.5 Disc slot-in circuit

84

3.2.6 Disc in/out circuit

3.2.7 Main axis control circuit

3.2.8 Decode circuit

3.2.9 Reset circuit

3.2.10 Video circuit

3.2.11 Audio circuit

3.2.12 USB/CARD circuit

Section Three Servicing Cases

3.3.1 Servicing cases

3.3.2 Troubleshooting flow chart

Section Four

Section Five Function Introduction to IC

3.5.1 function introduction to MT1389HD

3.5.2 function introduction to FLASH

3.5.3 function introduction to D5954

Waveform diagram

85

87

88

89

90

91

91

93

93

95

101

106

106

122

122

3.5.4 function introduction to 4558/4580

3.5.5 function introduction to 24CC02A

Chapter Four Disassembly and Assembly Process

Chapter Cinque PCB board & Circuit diagram

Section One PCB board

Section Two Circuit diagram

Chapter six BOM List

123

124

125

128

128

134

152

Chapter One About Maintenance

1.1 Safety precautions

1.1.1 Power supply

When maintenance personnel are repairing DVD TV, he should pay special attention to the power

with 220V 800V AC and 330V DC which will cause hurt and damage to persons!

1.1.2 Precautions for antistatic

Movement and friction will both bring static electricity which causes serious damages to integrated

IC. Though static charge is little, when a limited quantity of electric charge is added to large

scaleintegrated IC, as the capacitance is very small in the meantime, now the integrated IC is very much

easy to be struck through by static electricity or the performance will decrease. Thus static electricity

prevention is of extraordinary importance. The following are several measures to prevent static

electricity:

1. Use a piece of electric conduction metal with the length of about 2 metres to insert into the earth,

and Fetch the lead wire from the top of the surplus metal and connect to the required static electricity

device. The length and depth of the metal embedded under the earth should be determined according to

the wettability of the local soil. For humid places, it may be shorter, and longer and deeper for dry places.

If possible, it can be distributed and layed in terms of “#” shape.

2. On operating table-board, the antistatic table cushion should be covered and grounded.

3. All devices and equipments should be placed on the antistatic table cushion and grounded.

4. Maintenance personnel should wear antistatic wrist ring which should be grounded.

5. Places around the operating position should also be covered with electric conduction cushion or

Painted with antistatic paint.

1.1.3 Precautions for display screen

1. Display screen is breakable article, so please protect carefully when carrying and prevent fingers

or hard objects striking the screen to damage structure of the screen.

2. When cleaning screen, do not use organic chemicals. You should use cloth and use small

amount of special cleaning liquid in places difficult to clean.

- 1 -

1.1.4 Precautions for laser head

1. Do not stare at laser head directly, for laser emission will occur when laser head is working,

which will Hurt your eyes!

2. Do not use wiping water or alcohol to clean laser head, and you may use cotton swab.

1.1.5 About placement position

1. Never place TV in positions with high temperature and humidity.

2. Avoid placing near high magnetic fields, such as loudspeaker or magnet.

3. Positions for placement should be stable and secure.

1.2 Maintenance method

1.2.1 Electric resistance method

Set the multimeter in resistance position and test whether the numerical value of resistance of each

point in the circuit has difference from the normal value to judge the trouble spot. But in the circuit the

tested numerical value of resistance is not accurate, and the tested numerical value of integrated IC's

pins can only be used for reference, so the elements should be broken down for test.

1.2.2 Voltage method

Voltage method is relatively convenient, quick and accurate. Set the multimeter in voltage position

and test power supply voltage of the player and voltage of a certain point to judge the trouble spot

according to the tested voltage variation.

1.2.3 Current method

Set the multimeter in current position and test current of the player of a certain point to judge the

trouble spot. But when testing in current method, the multimeter should be series connected in the

circuit, which makes this method too trivial and troublesome, so it is less frequently used in reality.

1.2.4 Element substitution method

When some elements cannot be judged good or bad, substitution method may de adopted directly.

1.2.5 Cutting method

Cutting method should be combined with electric resistance method and voltage method to use.

This method is mainly used in phenomena of short circuit and current leakage of the circuit. When

cutting the input terminal voltage of a certain level, if voltage of the player rises again, it means that the

trouble lies in this level.

- 2 -

1.2.6 Visualized method

Directly view whether abnormalities of collision, lack of element, joint welding, shedding welding,

rosin joint, copper foil turning up, lead wire disconnection and elements burning up among pins of

Elements appear. Check power supply of the machine and then use hands to touch the casing of part of

elements and check whether they are hot to judge the trouble spot. You should pay more attention when

using this method to check in high voltage parts.

1.2.7 Comparison method

A same good PC board is usually used to test the correct voltage and waveform. Compared these

data with those tested through fault PC board, the cause of troubles may be found.

Through the above maintenance method, theoretical knowledge and maintenance experience, all

difficulties and troubles will be readily solved.

1.3 Required device for maintenance

Audio Generator

Digital oscillograph ( 100MHE)

SMD rework station

Multimeter

Soldering iron

Pointed-month pincers

Cutting nippers

Forceps

Electric screw driver

Terminals connecting cord

Headphone

Microphone

- 3 -

Chapter Two

Functions and Operation Instructions

Section One TV SEGMENT

2.1.1 Features

Technical Features

#High quality color TFT panel

#Maximum resolution 640X480 for LD2006SI

#Built-in DVD player with Slot-in mechanism

#Multisystem TV tuner with NICAM decoding

#Biuilt-in stereo audio system

#USB port to playback compatible files stored on flash memory of external devises

#Composite video ,audio input

#Component, RGB/SCART and video inputs

#Digital coaxial output for multi-channel sound playback

#Headphones output

#Universal holder for furniture or wall fixation with 270 rotation angle

TV Channels Receiving and External Signal Playback

#Automatic and fine tuning functions with 100 channals memory

#Adjustable brightness, contrast, saturation, hue and 4 preset image settings

#Tone and sound balance adjustment and 4 preset audio settings

Disc playback mode

#Digital video playback:DVD-Video, Super VCD, VCD compatibility

#MPEG-4 standard support

#Digital audio playback: CD-DA, HDCD and Mp3 compatibility

#Digital graphic albums playback: Kodak Picture CD and JPEG

#Compatible disc types: CD-R/CD-RW, DVD-R,/DVD-RW, DVD+R/DVD+RW

#Russia, Cls and Baltic States adaptation interface and filenames ID3-tags and CD-Text support

simplifies device operation

#”Q-Play” function provides direct playback and allows to skip commercial that is not possible to

rewind

#”Browser” function provides easy access to playback control

#Automatic screensaver function

#Parental control function to protect children from watching inappropriate discs

#Super wide range of operating power supplies(~100-240v) automatic short circuit protection

- 4 -

2.1.2 Set list

LCD TV
Remote Control
AAA Battery
RCA-RCA cord
2XRCA-2XRCA cord
Wall Mount Holder
Kickstand
Screw M5X15
Screw M4X10
Screw PA5X25
Screw PM45X10
Expandable pipe
User manual
Warranty Card

2.1.3 CONTROLS AND FUNCTIONS

(1) Panel controls and indication

1pcs
1pcs
2pcs
1pcs
1pcs
1pcs
1pcs
1pcs
1pcs
4pcs
4pcs
4pcs
1pcs
1pcs

6

1

2

3

4

5

7

8

9

Left panel

SETUP button

1

Press to switch to setup mode

2

_VOL+button

Press to adjust the volume.

_CH+button

3

Press to switch between channels/to

choose menu item.

SOURCE button

4

Press to choose the playback mode.

11

10

12

13

14

9

Front panel

8

Remote control sensor

9

Power supply indicator

Right panel

10

Disc tray

11

USB port

12

EJECT button

Press to open/close the disc tray.

13

STOP button

5

STANDBY button

Press to switch on the device/into

standby mode.

POWER button

6

Turn on/off the power.

7

Headphones output

- 5 -

Press to stop the playback.

PLAY/PAUSE button

14

Press to playback/pause.

(2) Remote control general view

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

26

MENU button

DVD disk menu/PBC function.

27

ANGLE button

Press to change the camera
angle/change the Mp3 and JPEG files
playback mode.

28

Q-PLAY button

Press to turn the Q-PLAY mode on.

29

SUBT button

Press to change the subtitles
language/change the display mode JPEG
files.

30

Button

Press to switch on the device/into standby
mode.

1

EJECT button

30

29

28

27

Press to open/close the disc tray.

2

LANG button

Press to change language.

DISP button

3

Press to display the disc information.

NICAM button

4

Press to choose audio mode.

26

25

24

23

22

21

20

19

18

17

16

Numeric buttons

5

BROWSE button

6

Press to turn on/off the browser function.

CURSORbuttons(UP/DOWN/LEFT/RIGHT)

7

OK button

8

SETUP button

9

Press to switch to setup mode.

Button

10

Press to return to the previous channel.

SOURCE button

11

Press to change the TV/DVD mode.

Button

12

Press to start rewind/rewind scanning.

13

Button

Press to skip backward.

14

REPEAT button

Press to repeat.

15

A-B button

Press to repeat the selected section.

16

Button

Press to turn on/off the sound.

VOLUME+/-button

17

Press to adjust the volume.

18

USB/DVD button

Press to select USB/DVD mode.

Button

19

Press to skip forward.

20

Button

Press to stop the playback.

21

Button

Press to forward scanning.

22

Button

Press to playback/pause.

ZOOM+/-button

23

Press to zoom in/out.

24

CANCEL button

Press to go one level back/cancel current
operation.

CH button

25

Press to switch between channels /to
choose menu item.

- 6 -

2.1.4 CONNECTION AND STARTING

SELECT RETURN

ENTER

SETUP

(1 )Switching interfaces

#You may adjust necessary parameters in the
device menu.
#Turn to Picture item on this page for details.

2

5

1

1

3

4

RF input

Meant for antenna connection.

2

COAXIAL OUT

Meant for multi-channel sound playback.

3

SCART socket

Meant for external audio video signal

source connection. There is no need to

use additional audiocord.

Y Cb(Pb) Cr(Pr)

4

AUDIO VIDEO IN

5

Used for external signal source

connection.

2.1.5

TV MODE

This LCD TV can store up to 100 channels and
enables to scan channels thought automatic,
manual and fine tuning scanning mode. Built-in
TV tuner supports stereo audio playback in
NICAM system.

(1) Adjusted channels selection

#Press +CH-buttons on the left panel or CH
buttons on the remote control each time, when
you want to change a channel.
#Use numeric buttons to enter the number of the
channel.
#Press button to return to the previous
channel.

(2) Default picture settings
selection

#You may select one of the default picture
settings:
USER, STANDARD, DYNAMIC and SOFT.

(3) Default sound settings
selection

#You may select one of the default sound
settings:
USER, MUSIC, FILM and NEWS.
#You may adjust necessary parameters in the
device menu.
#Turn to page.13 for details.

(4 )Accompanying sound type
#Only some of the TV channels have stereo

accompanying sound in NICAM system.
#Press NICAM button to select accompanying
sound.

(5 ) TV settings

#Press SETUP button to display the menu.
#Use cursor buttons on the remote control or

+CH-buttons on the left panel to select the item.
Use buttons to adjust selected parameter.
Use OK button for confirmation. Press SETUP
button again to return to the main menu or to
exit TV SETUP.

(6) Picture

#select PICTURE item to adjust picture
parameters.

#You may adjust BRIGHTNESS, CONTRAST,
SATURATION, TINT, SHARPNESS and COLOR
TEMP.

- 7 -

NOTE

You can’t adjust TINT while watching TV

channels.

(7) Sound

#Select SOUND item to adjust sound

parameters.
#You may adjust BALANCE, BASS, TREBLE
and NICAM.

(8) TV setup

Select TV SETUP item to adjust channels.

CHANNEL, COLOR SYSTEM, SOUND
SYSTEM, FINE TUNING, AUTO SEARCH,

MANUAL SEARCH and CHANNEL EDIT.
#CHANNEL item enables to select the number of
adjustable channel.
#CHANNEL EDIT submenu enables to select,

skip and swap the channel.

RETURN

SETUP

#CHANNEL parameter enables to select current
channel.
#SKIP function enables to make current channel

inaccessible while using +CH-button to browse
channels.

#COLOR SYSTEM item can be changed
between: AUTO, PAL and SECAM. We
recommend to set this item to AUTO.
#SOUND SYSTEM item can be changed
between: B/G, D/K, Land I.

(9) Function

You may select LANGUAGE, TRANSPARENCY,

SLEEP and RATIO.
#LANGUAGE item enables to select the OSD
language.
#TRANSPARENCY item enables to adjust
transparency of OSD.
#SLEEP item enables to set the sleep timer.
#RESET item enables to reset all values to

default.

(10) Video settings

#Press SETUP button to display the menu.

#In external video signal playback mode the

menu is the same as the menu, described on

pages 12and 13.

NOTE

In external video signal playback mode TV

SETUP item is inaccessible.

#SWAP function enables to select the channel

number to swap with current channel.
#SAVE parameter enables to confirm the swap
function.
#FINE TUNING item enables to adjust the
channel frequency accurately.
#MANUAL SEARCH item enables to change

channel settings.
#AUTO SEARCH item enables to adjust channel
setting automatically.

- 8 -

Section Two DVD SEGMENT

2.2.1 Controls and functions

Two USB PORTS

Disc tray

EJECT button

Press to open/close the disc tray.

STOP button

Press to stop the playback.

PLAY/PAUSE button

Press to playback/pause.

2.2.2 FUNCTION SETTINGS

(1) Function selection and change

#Press the SETUP key to show the setup menu. You will see the following image on the screen, as show
on the figure:
#Select the desired menu item using the UP/DOWN buttons button; press the OK key for confirmation.

Language

Image

Sound

Playback

Preference

Parental control

Initial help

Reset settings

Exit

Setup menu

DVD menu

Sound track

Subtitle

Off

1.For example, if you wish to change the image settings, you have to select the image item and press
the OK or RIGHT key.

TV system

TV format

Sharpness

Gamma

Brightness

Contrast

Hue

Saturation

AUTO

4:3

M.

Off.

+48

+48

AUTO

PAL

NTSC

0

0

- 9 -

2.Using the UP/DOWN buttons, select the

desired item and press OK or RIGHT button. For
example, select the Sharpness item. Settings
will appear on the screen. Then select the
desired sharpness level and press OK for
confirmation.

TV system

TV format

Sharpness

Gamma

Brightness

Contrast

Hue

Saturation

AUTO

4:3

Off.

+48

+48

High

L.

Medium

Low

Off

0

0

3. Press LEFT for exit to previous menu level.

4. Press SETUP to exit setup menu.

(2) Language settings

1. Setup menu: interface language set-up

#Options: Russian, English, Ukrainian.
#Default option: English.

Setup menu

DVD menu

Soundtrack

Sbutitles Off

2.DVD menu: selection of disc menu

language

3. Sound: selection of translation language

#Disc menu/translation language options:

Russian, English, Estonian, Lithuanian, Kazakh,

Romanian, Belarusian, Ukrainian, Chinese.

#Default menu/translation language option:

English.

#Selection of other languages: select the

OTHERS item using the wheel and press OK.

Enter the language code using the numeric

buttons and press OK.

#If the language you selected is not recorded on

the DVD disc, another available language will be

used.

4. Subtitles: selection of subtitles language

#Options: Off, Russian, English, Estonian,

Lithuanian, Kazakh, Romanian, Belarusian,

Ukrainian, and Chinese.

#Default option: off.

#Selection of other languages: select the

OTHERS item using the wheel and press OK.

Enter the language code using numeric buttons

and press OK.

English

#If the language you selected is not recorded on
the DVD disc, another available language will be
displayed.

(3) Image settings menu

1. TV system: TV system selection

#Options: Auto, PAL, NTSC.
#Default option: Auto.

2.TV Format: image ratio settings

#Options: 4:3 pan& scan, 16:9 letterbox and 16:9
TV,4:3 LB.
#Default option: 4:3 LB.
#Some discs are recorded with support of only

one ratio. The selected ratio must comply with
the TV screen.

TV system

TV format

Sharpness

Gamma

Brightness

Contrast

Hue

Saturation

Auto

4:3 LB

Off.

AUTO

PAL

NTSC

L.

0

0

0

0

3.Sharpness: image sharpness adjustment

#Options: High, Middle, Low.
#Default option: Low.

4. Gamma: adjustment of image color
temperature

#Options: High, Middle, Low, Off.
#Default option: Off.

5.Brightness: adjustment of image
brightness

6.contrast: adjustment of image contrast

7.hues: adjustment of image hues

8.Saturation: adjustment of image saturation

Adjustment of image brightness, contrast, hues
and saturation:
#Select the desired item of the image adjustment
section using the UP/DOWN buttons. Press OK
or RIGHT key to start adjusting the relevant
option.
#Change the option value using the wheel.
#Upon completion press the LEFT button of the
UP/DOWN buttons to return to image setup
menu.

(4) Sound settings menu

1.digital audio output
a).SPDIF format: set-up of digital audio
output options.

- 10 -

#Options: RAW, PCM.
#Default options: RAW.
#When you select the RAW option, the not
decoded signal is transferred to the LCD Tv’s
digital outputs, the decoded signal is transferred
to analog outputs. Decoding is performed by the
built-in decoder of the LCD TV. This feature is
meant to ensure that signal decoding at digital
outputs is performed by an external
device(e.g.an amplifier).
#If you select the PCM option, a PCM coded
signal will be transferred to the LCD Tv’s digital
outputs.

Digital output

Tuning

SPDIF format

LPCM

RAW

48kHz

B)LPCM:set-up of digital audio output
options to comply with different amplifiers
and receivers.

#Options: 48kHz 16 bit, 96 Khz 24 bit.
#Default option: 48 Khz 16 bit.

2. Sound correction
A)Equalizer: equalizer modes

#Options: Off, rock, pop live sound, dance music,
techno classics, soft sound.
#Default option: off.

B)Echo: echo effects

#Options: Off, concert, living room, hall,
Bathroom, cave, arena, cathedral.
#Default option: off.

C)Tone balance: adjustment of tone balance
level.

#Adjust the tone balance level using the cursor
buttons.
#Press the LEFT button to return to sound
correction set-up menu.

(5) Playback settings

1. DVD
Advertisement skip: skip the unskippable
block while playing a DVD disc.

#Options: Yes,No.
#Default option: NO.

2. VCD/SVCD
PBS menu: PBC menu on/off

#Options: On, Off.
#Default option: On.
#If On option is set, while reproducing discs, a
menu will appear, in which you can select the
order of playing the disc content. If the Off option
is set, the reproducing of content is performed in
the order, in which it is recorded on the disc.

DVD

VCD/SVCD

Files

Repeat

All types

Advertisemenu No

off

3.Files: selection of reproduced files on the
disc

#Options: Audio, Pictures, Video, All types.
#Default option: All types.

4.Repeat: file repeat mode

#Options: Off, Single, All.
#Default option: Off.

(6) Preference settings

1.Screensaver: screen saver on/off

#Options: On, Off.
#Default option: On.

Screen saver

Equalizer

On

Off

On

Off

2.Equalizer: spectrum analyzer

#Options: On, Off.
#Default option: Off.

(7) Parental control settings

1.Category: set-up of age restrictions to
prevent children from seeing undesirable
discs.

#Options: Any, Kid, G,PG, PG-13, PGR, R,NC-

17.

any

Kid

G

Allowed..

Set password

Any

PG

PG-13

PGR

R

NC-17

2.Change password: set-up of a four-digit
password to change the level of age
restrictions.

#Default option: 7890

Old password

New password

Verify

OK

Cancel

(8) Initial setup menu

Auto

PAL

NTSC

- 11 -

#Press the RIGHT key to enter the initial settings

Sign of trouble Cause of trouble Act ions t o ellminat e the trouble

No sound

1.Poor audio c able connec tion.

2.Disc dirty or damaged.

3.Sound disabled by the MUTE
button.

1.Mak e proper connect ion.

2.Clean the disc .

3.Pres s the M UTE button.

No image

1.Poor video cable c onnecti on.

2.Incorrect sett ings of your TV
set.

3.The TV is in the progressive
scan mode while y our TV set
does not s upport this mode.

1.Mak e proper connect ion.

2.Correct t he sett ings of your TV set.

3.Place the TV in the interlaced s can mode
through the TV's m enu.

Blac k and whit e image

1.incorrect TV c olor sy stem
selec ted.

2.Color level on the TV set
adjusted incorrect ly.

1.Set the appropriate c olor sy stem via the
menu: S ETUP>Image> TV sc an.

2.Readjust the c olor sy stem of your TV set.

menu, then select the desired item using the
cursor buttons and press OK key for confirmation.
#While being in this menu section, you cannot
return to the previous level by pressing the LEFT
key.

(9) Reset settings to default

Load factory settings

(10) Exit settings menu

Language

Image

Sound

Playback

Preference

Parental control

Initial setup

Reset to defaults

Exit

OK Cancel

#Select the exit item using the UP/DOWN
buttons and press the OK key to exit the menu.

#Resetting all settings and restoring default
options, except age restrictions level and
password.

2.2.3 OTHERS

(1) Useful notes

#To extend the service life of your LCD TV make pauses of not less than 30 seconds between switching

off and repeatedly switching on the LCD TV.

#Disconnect the LCD TV from the wall outlet after shutdown.

#Some LCD TV’S functions may not be applied to some discs.

#Use supply sources of rated voltage, otherwise the LCD TV may not function or be damaged.

#In case of the LCD TV’s occasional stops, please switch the power supply off and then on again.

(2)Trouble shooting

Please check probable causes of malfunction before addressing the service center.

- 12 -

Disc s c annot be read

1.Disc not insert ed.

2.Disc ins erted inc orrectly.

3.Condensat e on the DVD
player's laser head.

1.Insert the dis c.

2.Install the di sc with t he label s ide facing up.

3.Switch the TV on without disc for an hour.

Microphone does not
operate

1.Microphone is unplugged.

2.Low level of the microphone's
sound volume.

1.Connect the mi crophone.

2.Adjust the level of the mic rophone's sound
volume.

Remote c ontrol does not
operate

1.Remote control is i ncorrect ly
direct ed at the TV's sc reen.

2.Distanc e to the TV i s in
excess of 8 meters.

3.Run out bat teries .

1.Use t he remote c ontrol ac cording to the
manual.

2.Decreas e the dis tanc e to the TV.

3.Replace both batt eries.

some functions do not
work

1.Disc is recorded inc orrectly.

2.Incorrect key s equence.

3.St atic voltage on the housing.

1.W ait5-10 s econds and the device will
automat ical ly t eturn to norm al state.

2.Repeat t he operation one more t ime.

3.Switch the device off for 1-2 min

Unstable image 1.Incorrect TV set set tings . 1.Correct the TV set set tings .

(3)Technical characteristics

LD1506SI LD1906SI LD2006SI

Type
class

Size(")
Height(mm)
Width(mm)

15

228.19

304.13

0.297×0.297

19

256.5

410.4

0.285×0.285

20/50,8
306
408
0,707×0,707

Frequency

Vertical(Hz)
Horizontal(kHz)
Display color

Maximum Display
Mode

Resolution
Vertical frequency(Hz)

1024×768
75

1440×900
75

640×480
75

Inputs

Video
Composite
Component
VGA
RGB/SCART
Audio
Stereo
PC audio
Others
USB
RF

1
1
1
1

2
1

2
1

1
1
1
1

2
1

2
1

1
1

­1

2

-

2
1

Audio outputs

Headphone
Digital coaxial

1
1

1
1

1
1

TFT,colored
ll(ISO 13406-2)

Display

50-75
30-75
16 700

- 13 -

Color system

TV tuner
Video inputs

Sound system TV tuner

Disc types

Formats

:+12 :+12 -

Power supply

Power Consumption
(Maximum)(w)
Power Consumption
(Power Saving)(w)

65

<3

Environmental
consideration

Operating temperature(°,C)
Operating humidity(%)
Storing temperature (°,C)
Storing humidity(%)

Dimensions(mm) 438.7×295.7×73.4 498×370.6×82.5 620×450×202

Weight Net weight(kg) 6.5 7.1 8.1

54

<3

+5 +35 10-80

-20 +45

CD-R/RW,DVD-R/RW,DVD+R/RW

DK,I,BG,L

Built-in DVD

player

DVD-Video,DivX,XviD,SVCD,VCD,CD­DA,HDCD,MP3,WMA,Kodak Picture CD,JPEG

~100-240,50/60

Voltage and
frequency(V,Hz) Voltage of
external(V,A)

Power adapter

PAL,SECAM
PAL, SECAM, NTSC 3.58, NTSC 4.43,PAL60

#We are permanently improving the quality of our products; hence the product’s design, functionality

and technical characteristics may be modified without prior notice.

#We do not guarantee that all discs can be played smoothly due to the disc quality, disc recording quality

and recording format.

- 14 -

Chapter Three Principle and Servicing

The previous manual: TV part

Section One Principle of the player

3.1.1 Function

LD2006SI is a 20” LCD_TV with multiple functions, such as DVD playing and USB reading function.

Electronic scheme of TV part adopts 20” TFT display screen+inverter components

(INV604)+MST718+STV8216 +TDA7266P+ tuner JS -6H2/T121. MST718 includes MCU/video A/D

converter/LCD image processing circuit. DVD part electronic scheme adopts MT1389HD+64M

SDRAM+16M FLASH+D5954. HD62 loader can smoothly read MPEG4/MP3/CD/DVD format discs and

decode chip MT1389HD may support USB and card read function.

# Digital picture adjustment technology to adjust sharpness, brightness, contrast, hue and

saturation of pictures; gamma correction.

# Video circuit supports PAL/NTSC/SECAM/PAL60 multi-system video signals.

# Support USB/card read function.

# Compatible with DIVX, MPEG4 format film.

# Support PAL BG/DK/I, SECAM BG/DK/L/L’ RF signal modulating.

3.1.2 Block diagram of the player

3.1.2.1 This machine is mainly composed of the following PCB semi-finished products and display

screen components. Please refer to model list for allocation of the player:

1. Main video board (21903-4): this PCB semi-finished product is the main part of the player. Main

video board includes audio/video input circuit, audio selecting and amplifying circuit, video selecting and

LCD drive circuit, DVD decode and servo circuit. The main function is to fulfill audio/video signals’

processing and DVD function’s fulfilment.

2. Power board (@52006-0UL): power board is mainly composed of rectifying circuit and filtering

circuit. This PCB semi-finished product’s main function is to provide the player with working power.

- 15 -

3. Inverter components (INV607): inverter components are mainly composed of boost circuit and

protection circuit. This PCB semi-finished product’s function is to provide display screen components

with lamp working voltage.

4. Remote control receiving board (B1903-1): this semi-finished product is composed of one IR

sensor and working indicator light. This PCB semi-finished product’s main function is receive the control

order that sends from remote controller and transmit to MCU part of main video board to control the

working state indication of the player.

5. TV button board 41903-0/DVD button board J1903-0: mainly composed of buttons which are

responsible for the function control of TV part and DVD part.

6. USB board D1903-1: this PCB semi-finished product includes USB jack circuit and it is mainly

responsible for USB read function.

7. Display screen components: include LCD display screen, lamp, LCD screen drive circuit and jack

circuit. The main function is to revert video signals to image to supply for clients to enjoy video images.

TUNER

If1

If2

U119
PN2020

TSDATA0~TSDA TA7

U116
MT8606

XIDD0

XIDD8

DVB/CARD
switch
U108/U2

MSD0

MSD1

CRAD
BOARD

OPEN/
CLOSE
circuit

LOAD+

LOAD-

DVD
LOAD

DVB part

20.48MHZ

X602

XIDD0~XIDD15

GPIO_3

GPIO_4

TROPEN
TRCLOSE

FOSO
TRSO
FMSO
DMSO

SL+

SL-

Servo drive

U302
DVD

X109

27MHZ

FLASH

DFA[0:20] DFD[0:7]

Mt1389

DVD decode
chip

39

54

TK+

Ba5954

U118

TK­FC+

FC-

109

98
100

226
224

A/B/C/D/E/F

DVD
PICK_UP

DY

DPB

DPR

DDQ[0:15]

DMA[0:11]

DSCL

DSDA

89AL
89AR

Y PB PR
INPUT
JACK

EPR

Video

Electronic
switch

FSAV433

SR SGSB

U301

SDRAM

DCVBSIN+/DCVBS-

EEPROM

U303

24C16

4580

U117

Audio
amplifying
circuit

23

U113

TEA5764

24

SCART JACK

J105

AV input terminal

EY

U106

SCART
JACK

TUNER

DVSTB
DVSCK
DVSDA

DRIN

DLIN

FMR
FML

SRIN
SLIN

AVRIN
AVLIN

EPB

PRIN

PBIN

Y

12MHZ

SCVBS+

SCVBS-

SCLTX
SDARX

Video
amplifying
circuit

TV+/TV-

U107

Electronic
switch

Cd4052

key-press board &
receiving board of
remote control

KEY2

X101

IR

KEY1

7/8

9/10

12/13

24

25
67

66

34

22/23

30/31

73 83

63

Vs1

Vs2

8216_RST

AI3L

13

AI3R

3

PCLIN

Boost

VGA

control

JACK

circuit

U101
MST718
LCD
image
processor&
MCU

74

60

T4094

VSDA

PANEL_ON

1

U102
CD4094

23

U111

NICAM processing
circuit

24

STV8216

15

14

PC AUDIO

J103

73

PCRIN

SIOMAD

Brigtness

BLON

+12V

INVERTER_ON/OFF

SPICK
SPIDI

U104 FLASH

SPIDO

PS25LV010

SPICZ

DG0~DG7

DB0~DB7
DR0~DR7

HSYNC
VSYNC

DE
CLKO

MST_RESET

VSCK

SEL_I/P

3

2

AMP_STB
ANT-POW
ASW
MUTE

ONMUTE

LSL

28

LSR

29

18

19

9/10

AO2L

MONOIN

TUNER

U114

AO2R

U103
EEPROM
24C32

Reset circuit
Q103 Ce101

4

Audio

12

amplifying

TDA7266

Audio
output
amplifying
circuit

INVERTER

BOARD

PANEL

1

2

15

14

SCART

figure 3.1.2.1 Block diagram of the player

- 16 -

Annotate: 3.1.2.1 Block diagram explanation: this machine is divided to 3 parts according to

SN Material code Material name Specs & Model Qty

Position

Number

Function

1 790021 FET IRF7416 SOP 1 U511 (+)12V switch control pipe

2 883191 IC TDA7266SA ZIP 1 U112 Audio amplifying IC

3 882030 IC STV8216 TQFP 1 U111 NICAM processing IC

4 883189 IC MST718BE PQFP 1 U101 LCD image processing&CPU

5 883323 IC AP1506Adj TO263-5L 2 U503,U506 (+)5V voltage stabilizing IC

6 882953 IC K4S641632K-UC60 TSOP 1 U301 SDRAM

7 882076 IC LM1085-3.3 SOT-263 1 U521 DV33 voltage stabilizing IC

8 882883 IC FSAV433 TSSOP 1 U106 Components video selection IC

9 790126 SMD FET FDS9435A SOP 1 U502 Display screen power control pipe

10 880504 IC 24C32N SOP 1 U103 TV EEPROM

11 882756 IC HEF4094BT SOP 1 U102 Serial/parallel converter

12 882515 IC HEF4052BT SOP 1 U107

Sound source selecting electronic

switch

13 882485 IC AZ1117H-3.3 SOT-223 2 U505,U513 3.3V voltage stabilizing IC

14 883245 IC AZ1085S-2.5Z TO-263 1 U507 2.5V voltage stabilizing IC

15 882121 IC AK18 SOT-223 1 U1 1.8V voltage stabilizing IC

16 1020094 Tuner JS-6H2/T121 1 U114 Receive TV signal

17 900458 Software program ROMLD2006SI2-0A(2M) 1 U104 TV software program

functional module.

1. TV part: according to design demands, TV part mainly includes LCD image processing, audio

processing and amplifying circuit, MCU control circuit.

2. According to design demands, DVD part mainly includes decode circuit and servo circuit.

3. DVB circuit: DVB circuit mainly includes channel decoder and TS decoder. This machine does

not use this function, to facilitate understanding, so we use gray colour to mark the unused part in the

block diagram.

3.1.3 Function introduction to IC of the player

Function introduction to IC of the player is shown as in the following figure:

- 17 -

Section Two Unit Circuit Principle

3.2.1 System control circuit

System control circuit is mainly composed of reset circuit, clock circuit t, serial/parallel conversion

circuit, software program, EEPROM and MCU (MST718 is built inside). The built-in MCU of MST718 is

mainly responsible for the coordination and control of system of the player. This MCU is connected with

a 2M ROM externally, which is used to store software and control function of the player. Since I/O port of

MST718 is limited, a serial/parallel conversion circuit (CD4094)is added to extend I/O port. Functions

may be adjusted through software. MST718 is connected with a 32k EEPROM externally, used to store

user-set information.

1. System reset circuit

(1) system reset circuit is shown in the figure 3.2.1.1:

68

MST718

Figure 3.2.1.1 System reset circuit diagram

(2) Working principle: this circuit is a typical low level effective reset circuit. After power on, “+5V

EXT” changes from 0V to 5V,and charge R282 through CE101,Voltage of two ends of CE101cannot

change suddenly, now Q103 is saturated on, C-E electrode is connected, MST RESET is low level to

provide pin 68 of U101 with a low level reset signal to reset MST718. After capacitor CE101 is fully

charged, voltage on two ends is near to 5V, now Q13 cuts off, voltage of pin 68 of MST718 restores to

high level to finish reset action.Reset time of this circuit is about 100MS, which is decided by the value

of R282 and Ce101. Function of D100 is to discharge Ce101 quickly to ensure the reliable reset when

power on for the second time. The trouble that appears in this circuit is that machine cannot enter

standby state after power on, and machine fault after power on.

- 18 -

2. System clock circuit

(1) System clock circuit is shown in the figure 3.2.1.2:

120

MST718

121

Figure 3.2.1.2 System clock circuit

(2) Working principle: this clock circuit is mainly composed of X101, C104 and C103, in which X101

is a 12MHZ crystal oscillator; C104 and C103 are externally-connected resonance capacitors to produce

a 12MHZ clock signal to provide for MST718 to generate clock signal required by system through

internal doubling circuit to act as working clock.

3. System control principle

(1) System control schematic diagram is shown in the figure 3.2.1.3:

Key-press board

Reset circuit

Remote control board

MT1389HD

KEY1~KEY5

RESET

IR

DVSTB
DVSCK

DVSDA

U104

PS25LV010

Z

DI

O

C

I

I

ID

SP

SP

SP

T4094

SCART JACK

K

S

P

S

PIC

W

S

MST718

MCU

VSDA

FB

VSCK

X

CLT
S

X

SDAR

INVERTER ON/OFF

STBY

8216_RST

PANEL_ON

Inverter components

power control circuit

STV8216

PANEL_ON
control circuit

U107

Cd4052

Audio input selection

Mute control circuit

Vs1

Vs2

U102

MUTE

Cd4094

Serial/parallel converter

ONMUTE

Figure 3.2.1.3 System control schematic diagram

- 19 -

ASW

ANT-POW

AMP_STB

SEL_I/P

U109/CD4053

DVB/TV

Tuner power control circuit

TDA7266 audio amplifying

LCD_TFT

(2) Working principle

System control circuit of the player is composed of the built-in MCU of MST718 and software

Program. Machine power on: after 12V power is being rectified by U503, +5V power outputs to provide

for system control circuit. The reset circuit of system control circuit begins to reset MST718, the red

indicator light on remote control receiving board is on under the control of STBY signal (high level), and

this means machine enters standby state.

The process from standby state to power on state: after pressing POWER button on panel or wake

code on remote controller, pin 57 of MST718 changes from high level to low level, pin STBY outputs a

low level signal to make Q117 cutoff, /STBY skips to high level, STBY is divided to 3 parts: +5V power

control circuit composed of Q3/U506; +12V power control circuit composed of Q117/U511 and standby

indication circuit on remote control receiving board. Power supply of machine is normal, MST718 begins

to output reset and other control signal (please refer to waveform diagram for sequence of each control

signal output) to reset and control circuit of other module to make machine enter normal working state.

The process from working state to standby state: when machine is in power-on state, after

pressing POWER button on panel or wake code on remote controller again, machine enters from power-

on to standby, now pin 57 of MST718 outputs high level, /STBY pin output low level, +5V power and

+12V power of machine are cut off and machine enters standby state.

4. IIC bus control circuit

(1) IIC bus control circuit block diagram is shown in the figure 3.2.1.4:

U101

MST718

TUNER

SDA

SCL

U103

24C32

Ic301

STV8216

Figure 3.2.1.4 IC bus control circuit block diagram

U119

PN2020AT

U113

TEA5764

(2) Working principle: IIC bus is a kind of simple, dual-direction and synchronous serial line

developed by PHILIPS company. Only 2 lines (serial clock line and serial data line) are required to

connect between components on bus to transmit information. This bus is high-performanceserial bus

which has function of decision and synchrony of high and low speed devices required by multi-player

system with wide application range. shown in the figure 3.2.1.4, U103 is a 32K memorizer used to store

user information.

- 20 -

5. Serial/parallel conversion circuit

(1) Serial/parallel conversion circuit is shown in the figure 3.2.1.5:

SEL_I/P

AMP_STB

ANT_POW
ASW
Vs1

Vs2
MUTE

ONMUTE

MST718

MCU

T4094

VSDA

VSCK

Figure 3.2.1.5 Serial/paralle conversion circuit

Serial/paralle

converter
Cd4094

(2) Working principle:

Because jack of MST718 is limited, in order to extend control port, a serial/paralle converter

(CD4094) is added in MCU peripheral. CD4094 is a serial in/paralle out high speed converter with output

latch and 3-mode control and its advantages are easy usage, low power consumption, strong drive and

flexible control. {1} pin is latch end, {2} pin is serial data input end, {3} pin is serial clock end. When {1}

pin is high level, the increase of 8-bit paralle output port Q1~Q8 changes with serial input; when {1} pin

is low level, output is locked. Using latch end may conveniently perform chip selection and output control.

{15} pin is parallel output state control end, when {15} pin is low level, parallel output end is in high

resistance state; when using CD4094 as display output, the display number may flicker. QS of pin {9}

and Q’S of pin {10} are serial data output end. Control signals after conversion are used in control mute

circuit/sound source selection circuit.

6. Working state indication circuit

(1) Working state indication circuit is shown in the figure 3.2.1.6:

Figure 3.2.1.6 Working state indication circuit diagram

- 21 -

(2) Working principle: when machine is in standby state, pin 57 of MST718 outputs high level signal

To make standby control circuit \STBY signal outputs low level signal. This signal is directly connected to

pin 3 of remote control receiving board flat cable holder Cn801. This control signal inputs to base

electrode of Q801/Q802 through R804/R805 to make Q802 cutoff, Q801 is connected, the red light of bi-

color diode D801 is on, which means that machine enters standby state. After pressing POWER button,

machine enters working state, pin 3 of ,Cn801 outputs high level to make Q802 on/Q801 cutoff, the

green light of b-icolor D801 is on, which means machines enters working state. S801 is IR sensor to

receive remote control signals mainly.

3.2.2 Audio circuit

Audio processing circuit is mainly responsible for the switch, amplifying and restire of audio and

composed of audio source input selection and NICAM processing circuit, audio amplifying circuit and

mute control circuit. Audio processing circuit block diagram is shown in the figure 3.2.2.1:

PC AUDIO
J103

TUNER

U117 4580

AV_IN J105

SCART JACK

DRIN

DLIN

AVRIN
AVLIN

SRIN
SLIN

PCLIN

PCRIN

MONOIN

SIOMAD

CD4052

Electronic
switch

Figure 3.2.2.1 Audio processing circuit block diagram

1. “Nicam” processing circuit

13

73
78

Multi-channel

audio selection

9

10

NICAM signal

processing

Ic301

AI3L

AI3R

3

Vs1
Vs2

STV8216

23

24

CD4094

28

29

LSL

LSR

4

TDA7266

Audio
amplifying

12

Audio output
amplifying

circuit

1
2

15

14

Headphone
socket

(1) NICAM: the core technoloy of “NICAM” is the NICAM728 technology developed by BBC.

Besides transmitting TV image and simulating mono-channel signal, NICAM TV broadcasting system also

transmits dual-channel digital coding sound signal. NICAM is famous for clear treble and deep bass with

the sound quality close to listeing to CD disk directly. In the aspect of SNR, dynamic range and channel

separation index, NICAM is far better than the current FM accompany. As TV accompany, NICAM

applies 3 kinds of working mode currently: 1) Bilingual mode: NICAM transmits dual-channel digital

sound relevant or irrelevant to the current program and transmits 3-channel sound signal together with

- 22 -

The original FM analog accompany, which are suitable for multi-language areas; 2) Stereo mode: two

digital channels of NICAM transmit left and right channel sound signals of stereo separately, and the

original FM analog accompany only transmits mixed sound signals of 2 channels to be compatible with

TV set without NICAM function; 3) Mon0-channel mode: two channels of NICAM transmit one channel

sound signals and one channel data signal, which is equal to providing 3-channel signals together with

the original TV analog accompany.

(2) “NICAM” processing circuit: when tuner receives NICAM signal, it outputs from pin 11 of tuner

(SIOMAD), and inputs into pin 73 of STV8216 through the filtering circuit composed of C301, C302

components and then restores to audio signal through being modulated by internal circuit of STV8216

and sends to audio amplifying circuit through pin 28, 29 of STV8216. STV8216 block diagram is shown

in the figure 3.2.2.2:

Figure 3.2.2.2 STV8216 internal block diagram

2. Sound source input selection circuit

Besides NICAM processing circuit, STV8216 also includes multi-channel sound source selection

function. After the machine enters from standby to power-on, systems sends a low level effective reset

signal to pin 43 of STV8216 to reset STV8216. IIC bus means is adopted between STV8216 and

MST718 for communication. When system working state is set in SCART input, Cd4052 outputs SCART

signal under the control of MST718 and then input to STV8216, now pin 23, 24 of STV8216 output the

audio signals inputted by SCART_IN and also output two groups of audio signals as external output

signal through pin 18, 19. Working principle of other groups’ sound source input is the same, so we will

not introduce here.

External input sources of this player are many and input port of STV8216 cannot meet the demands,

so a CD is added in front of STV8216 to switch in DVD_AUDIO/external input terminal and SCART

AUDIO input port.

- 23 -

3. Audio amplifying circuit

(1) Audio amplifying circuit is shown in the figure 3.2.2.3:

Figure 3.2.2.3 Audio amplifying circuit diagram

(2) Working principle: TDA7266P is a 3W+3W dual-bridge audio amplifying. Audio signals input

through pin 4, 12 of TDA7266 and then output from pin 1, 2, 14, 15 of TDA7266P after being amplified

by internal dual-bridge audio amplifier to drive loudspeaker to make sounds. This IC adopts +10V power

supply, D122/D123 is drop diode and pin 7 is standby control pin. After machine enters power-on state,

pin 12 of cd4094 (AMP_STB) outputs high level and this IC enters working mode. This player adopts

default high level mode, so R22 is not used, but R28 is adopted to connect onto power. Pin 6 is mute and

controlled by mute circuit.

4. Mute control circuit

(1) Mute control circuit is shown in the figure 3.2.2.4:

Figure 3.2.2.4 Mute circuit diagram

Òô¿ØÖƵç·ͼ

- 24 -

(2) Working principle

Power-on mute: after power on, machine enters from standby to power on. Because of R28, pin 11

of TDA726P is low level, now ONMUTE pin of Cd4094 outputs high level signal, OUTMUTE is high level,

,Q113/Q112/Q119 is saturated on, machine enters mute state to realize power-on mute effect. After

machine starts up, ONMUTE switches to low level, Q113/Q112/Q119 cuts off to make pin 6 of TDA7266

high level, TDA7266 enters non-mute mode, the player has sound output and power-on mute fulfills.

Power-off mute: when machines enters standby mode from working state, ONMUTE pin outputs high

level, OUTMUTE pin is high level signal, TDA7266 enters mute state.

Power failure mute: when power of machine is switched off, Ce151 has been fully charged when power

on, after machine power switches off, Ce151 discharges through Q118/D121 to make Q119 connected,

now pin 6 of TDA7266 is low level to realize power-off mute function.

When user use remote controller to mute the machine, MUTE pin outputs high level signal to make Q119

saturated on, pin 6 of TDA7266 is low level and TDA7266 enters mute mode.

(3)SCART Audio output amplifying circuit:

SCART Audio output amplifying circuit is shown in the figure 3.2.2.5:

Figure 3.2.2.5 SCART Audio output amplifying circuit diagram

Working principle: the picture is an amplifying circuit composed of triode, mainly used in audio

output amplifying. Q114/Q115 in the picture is amplifying pipe,CE131/CE130 is blocking capacitor,

Q113/Q112 is mute pipe which is used for power on/off mute. Audio signals outputted by this circuit are

used for SCART output.

- 25 -

3.2.3 Video circuit

Video circuit is mainly responsible for the input of external video signals, the processing of video

signals send from tuner, and the drive processing of LCD screen, including video input selection, video

A/D conversion circuit, LCD picture processing circuit and video output circuit. Video circuit block diagram

is shown in the figure 3.2.3.1:

Y PB PR
INPUT
JACK

Mt1389

EY
EPB
EPR

DY
DPB
DPR

U106

Video
Electronic
switch

FSAV433

SR SGSB

SCART
JACK

DCVBSIN+/DCVBS-

PRIN

PBIN

Y

X101

12MHZ

SCVBS+

SCVBS-

SCLTX

SDARX

video

amplifying

7/8

9/10

12/13

24
25

67
66

34

22/23

U101
MST718
LCD picture
processor&
MCU

30/31

DG0~DG7

DB0~DB7

DR0~DR7

HSYNC

VSYNC

DE

CLKO

TV+/TV-

PANEL

TUNER

Figure 3.2.3.1 Video circuit block diagram

1. Video input and video processing circuit

His circuit is mainly composed of FSAV433 and MST718, MST718 supports NTSC, PAL and

SECAM video signals and the supportable video signal format has RGB, YPbPr, CVBS or S-video video.

The built-in A/D converter can realize multi- format’s conversion function. MST718 adds video switch,

A/D converter and MCU on the basis of MST518 and MST718 also has video output function. Output jack

includes TTL, LVDS modes.

When machine is set in DVD or DVB mode, Y PB Pr signal is inputted to pin 2/6/10 of FSAV433,

and then output from pin 13/15/17 after being selected through electronic switch (FSAV433) to MST718

for A/D conversion. At the same time, Mt1389 also outputs composite video signal, after being selected

through the internal video electronic switch of MST718, output from pin 34 of MST718 to the video

amplifying circuit composed of Q100, Q1 and then output to SCART video output pin.

- 26 -

2. LCD image processing circuit

Pin Name

Signal

direction

Function description Pin Name

Signal

direction

Function description

1 A(B)OUT I Audio right channel input 12 NC Networ k commun ication dat a lin e 2

2 A(B)IN O Audio right channel output 13 RETURN Pr signal ground

3 A(A)OUT I Audio left channel input 14 RETURN Blanking signal ground

4 A-COM Audio signal ground 15 RED I/O I/O Pr signalI/ O port

5 RETURN Pb signal ground 16 BLK I/O I/O

Blanking signal I/ O port

6 A(A)IN O Audio left channel output 17 RETURN Blanking signal ground

7 BLUE I/O I/O Pb signalI/O port 18 TRTURN Composite video signal ground

8 FUNCSW I Function selection jack 19 V-OUT I Composite video signal input

9 RETURN Y1 signal ground 20 V-IN O Composi te vid eo sig nal output

10 CONT I/O

Networ k commun icat ion dat a
line 2

21 GND Common

11 GREEN I/O I/O Y1 signal I/O port

LCD image processing circuit is composed of MST7187 And peripheral elements, Responsible for

switching the exterior inputted analog video signals into signals required by LCD drive.

MST518 is a high-performance and high integration picture processing chip designed for LCD,

which can support SXGA format. multi-format output display jack (support TTL, LVDS, RSDS). This

player adopts analog signal, MST718 built-in MCU, MST518VA has multi-format output display jack. TTL

output means is adopted in this player and the output means can be adjusted through software

according to screen’s drive means.MST7187outputs DR0~DR7/DG0~DG7/DB0~DB7 to drive display

screen, and also outputs clock, enable and synchronous signals to supply for the working of screen (770

OCLK clock output, 78 DE enable signal, 79 VSYNC filed synchronous output and 80 HSYNC line

synchronous output).

3.2.4 Input circuit

External input means of TV has SCART\CVBS and Y/PB/PR, and also composite video and stereo

audio output function.

1.Introduction to SCART terminal :

SCART terminal is a standard input port in Europe. In this jack circuit, many dual-direction diodes

are adopted and act as protection function to prevent the instability of externally-conected device or

damage of the machine due to static. SCART pin function is shown in the following table:

- 27 -

2. TV Tuner circuit

Pin Name Function Pin Name Function

1 NC NC 8 NC DVB input jack is unus ed

2 VT Connect with external power 9 NC NC

3 VS (+)5V power supply pin 10 NC NC

4 SCL SCLis connected with MCU 11 SIF SIOMAD

5 SDA SDA is connected with MCU 12 TUNER_CVBS Video output

6 AS AGC control end is unused 13 VIF

5V power is connected

externally

7 AFC DVB input jack is unus ed 14 AUDIO Audio output

(1) Tuner circuit is shown in the figure 3.2.4.1

Figure 3.2.4.1 Tuner circuit diagram

(2) Working principle: this tuner includes middle frequency amplifying circuit, which adopts IIC bus

means to perform function control (such as select channel and search channel) through MST718 built-in

MCU. After high frequency signals are modulated, video signals and audio signals are separated

through being filtered by internal filter of tuner. Audio and video signals output from pin 12, 14 and then

send to audio and video processing circuit. When tuner receives NICAM signal, NICAM signals output

From pin 11 of tuner to STV8216 for modulating.

(3) Tuner pin function is shown in the following table:

- 28 -

3.2.5 Power circuit

1. Power circuit block diagram

(1) Power circuit supplies stable and pure power for each unit circuit to ensure normal working of the

player. Power circuit block diagram is shown in the figure 3.2.5.1:

IC 503

AP1506

U511

+12V

Power Board

Standby

control circuit

AP1506

U506

INVERTER
BOARD

U502

Si9435

Figure 3.2.5.1 Power circuit block diagram

+5VEXT

+12V

STBY

5V

FOR PANEL

U505

AMS11 17

U507

Lm1085

MST718

U513

U1

AMS1117

U521

Lm1085

3.3V

+2.5V

MST718

+3.3V

1.8V

Dv33

(2) Working principle: after AC power is being rectified and filtered through power board, 12V power

outputs. This power is inputted to voltage stabilizing circuit of video main board through socket Cn6 for

voltage stabilizing. The power outputted after being voltage stabilized is working power of each circuit.

Voltage stabilizing circuit on video main board is divided to 3 parts: 1) +5VEXT outputted after being

voltage stabilized by Ic503 is mainly supplied for system control circuit; 2) +5V power outputted after

being voltage stabilized by is mainly supplied for DVD/DVB circuit; 3) +12V voltage stabilizing and

control circuit supply working voltage for rear audio circuit.

(3) Introduction to each functional module in the picture: U502 is display screen power control pipe,

controlled by PANELON signal outputted by MST718; U511 is 12V power control pipe; U505/U507 is

voltage stabilizing IC, which supplies working power for MST718; U516/U1/U521 is voltage stabilizing

IC and voltage outputted after voltage stabilizing is supplied for DVD circuit. Please refer to the following

part “Principle analysis” for working principle.

2. +5VEXT

(1) +5VEXT

the figure

Voltage stabilizing circuit and display screen Power control circuit

Voltage stabilizing circuit and display screen Power control circuit diagram is shown in

3.2.5.3:

- 29 -

Figure 3.2.5.3 Voltage stabilizing circuit and display screen Power control circuit diagram

(2) Working principle:

+5VEXT voltage stabilizing circuit: after the AC power inputted externally is being rectified/filtered

through power board, +12V power inputs to main video board. +12V power is divided to multi-group

power supply. One group inputs to the +5V voltage stabilizing circuit composed by U503 (Ap1506)

(Ap1506 is a voltage drop type voltage stabilizing IC), after the 12V power inputted by power board is

being voltage stabilized through Ap1506, +5V power outputs directly. Pin 4 of Ap1506 is feedback end

and the resistance of its externally-connected resistor may adjust the output voltage. To facilitate to

differentiate +5VEXT mark ion circuit, this group of power is mainly used for MST718 and each control

circuit and supply working power for the player when in standby working state.

Display screen working power control circuit: display screen power has +5V/+12V. Display screen

of this player adopts +12V power supply, so L219 is not used in circuit but L16 is used for power supply.

U502 in the picture is a MOS pipe used for switch function to control power supply of display screen.

This MOS pipe is controlled by PANELON signal. When machine is in standby, PANELON outputs high

level signal and U502 cuts off.

After machine power on, pin 74 of MST718 outputs low level signal to make Q505 cutoff, Q504/U502

is connected, +12V power outputs to display screen through U502 and display screen begins to work.

- 30 -

3. +12V

Power control circuit

(1)+12V 3.2.5.4:

Power control circuit diagram is shown in the figure

Figure 3.2.5.4 Power control circuit diagram+12V

(2) Working principle: this +12V power is mainly used in audio circuit. When in standby working

state, STBY is high level, Q117 is connected, Q116/U511 cuts off, 12V power cannot pass through S-D

electrode of U511 and cannot supply power for audio circuit and audio circuit cannot work. After machine

enters power-on from standby, STBY becomes low level, Q117 cuts off to make Q116/U511 connected,

power inputs to audio circuit through U511S-D electrode and audio circuit begins to work.

4. MST718 working power voltage stabilizing circuit

(1) +2.5v/3.3V voltage stabilizing circuit

3.3V voltage stabilizing circuit is shown in the figure 3.2.5.4:

Figure 3.2.5.4 3.3V voltage stabilizing circuit

- 31 -

(2) Working principle: MST718 is a multi-function chip with built-in MCU and A/D converter, so the

power supply adopts multi-group power supply. +5VEXT introduced above is supplied for the working of

built-in MCU, so we do not introduce here. The picture mainly shows +2.5V and 3.3V power supply

voltage stabilizing circuit and this power is manily supplied for MST718 ADC circuit and LCD image

processing circuit. U507 is 2.5V voltage stabilizing IC. To reduce IC power consumption, D129 is added

for voltage drop. U505 is 3.3V voltage stabilizing IC.

5. DVD working power voltage stabilizing circuit

(1) DV33/1.8V voltage stabilizing circuit diagram is shown in the figure 3.2.5.5:

Figure 3.2.5.5DV33/1.8V voltage stabilizing circuit

(2) Working principle: this circuit mainly supplies power for DVD part circuit. +5V power in the picture

inputs to pin 3 of U1, through being voltage stabilized by U1, +1.8V voltage outputs from pin 2 of U1 to

supply for decode chip Mt1389, at the same time +5V power inputs to pin 3 of U521, 3.3V power outputs

from pin 2 of U521 to supply working power for DVD system circuit.

6. Inverter components control circuit

(1) Inverter components control circuit is shown in the figure 3.2.5.6:

- 32 -

Figure 3.2.5.8 Inverter components control circuit

(2) Working principle: after machine power on, +12V power is normal, machine is in standby state,

pin 76 of mst718 (INVERTERON/OFF) outputs high level, Q102 is saturated on, pin 3 of Cn103 is low

level and boost board stops working. After machine enters power-on from standby, pin 76 of mst718

(INVERTERON/OFF) outputs low level, Q102 cuts off, pin 3 of Cn103 is high level, boost board enters

working state. This signal does not send out until system starts up totally.

- 33 -

Section Three Servicing Cases

3.3.1 Servicing cases

[ Example 1 ] symptom: machine not power on

Trouble description: after inserting power cord, standby indicator light is on. After pressing power

switch, green indicator light flashes once and the machine power off.

Analysis and troubleshooting: according to trouble symptom, we judge that trouble mainly lies in

power system. Firstly check whether power board can work normally. Test whether power board flat

cable +12V is normal when power on; unplug the 6P power supply flat cable from power board to main

board, after connecting with power, use multimeter to check whether 12V voltage output in power board

flat cable holder is normal; insert the flat cable from main video board to power board and check whether

voltage output is normal; press POWER button, after voltage skips to low level, machine power off, so

we doubt that power board cannot load. To further conform the causes, unplug power cord, connect a -

10 ohm resistor in power board flat cable holder +12V position to ground (or change a power board for

test), after connecting with power, voltage in this position changes all the time. According to the

symptom, we can judge that power board cannot load. The reason is that 12V filtering capacitor has

electric leakage/switch transformer has trouble, or the preliminary reverse clipping circuit cannot work

normally, or Ic1377 protects ahead of time. After test, we find that the secondary rectifying and filtering

circuit is normal, so we judge that trouble is caused by preliminary part. After power off, we check one by

one and find that Vd2 in reverse clipping circuit has cut off. Change diode with the same specification,

trouble is removed.

[ Example 2 ] symptom: power not on

Trouble description: after inserting power cord, indicator light is not on. Press POWER button and

machine cannot power on.

Analysis and troubleshooting: according to trouble symptom, we judge that trouble lies in power

circuit and system circuit. Firstly make sure whether power board has +12V voltage output; unplug 6P

flat cable in Cn6 position, check voltage and 12V output is normal, which means that power board works

normally. Press POWER button, check 12V voltage in Cn6 position and it is normal, which means there

is no load or short-circuit on main board. Check 5V voltage of pin 2 of main board U503 and it is normal.

Test after words and find that two ends of Ce503 have no 5V voltage output, so we doubt L503 has

- 34 -

Trouble. Use multimeter to test and find L503 has open circuit. When meets this symptom, do not hurry

to power on, use multimeter to test whether resistance on two ends of Ce503 becomes small. After test,

5V power resistance to ground is normal (note: as for machine with abnormal resistance to ground, do

not install L503 until trouble is removed). After changing L503, power on and test. Machine works

normally and trouble is removed.

[ Example 3 ] symptom: machine not power on

Trouble description: after inserting power cord, red indicator light flickers all the time. Press

POWER button and machine cannot power on.

Analysis and troubleshooting: according to trouble symptom, we judge that power part has short-

circuit or large load. After power off, firstly check +12V resistance to ground of main board and

resistance does not become small. Cut off the 6P power supply flat cable between power board and

main board; connect a 10 ohm resistor between 12V power cord and ground wire on power board to act

as load; use oscillograph to observe waveform on resistor, level changes all the time, and power board

protection circuit begins to work. Low voltage part has two-channel over-voltage protection circuit, in

which one performs constant output for 12V power through Tl431 sampling; and the other makes the

output less than 15.6V through 15V voltage stabilizing pipe. Check the peripheral elements of the two

channels one by one and find that VD6/ 15V/0.5W has been stricken through. Change voltage stabilizing

pipe with the same specification, trouble is removed.

[ Example 4 ] symptom: TV has no sound output

Trouble description: insert antenna, TV can receive program, but speaker has no sound output.

External input audio is normal.

Analysis and troubleshooting: NICAM signals are received from tuner, which is used to receive TV

signal and decompose the received signal to audio/video signal to output. When meets this kind of

trouble, do not hurry to repair, firstly confirm whether there is sound output when in SCART, AV input

mode. After confirming, there is sound output in other mode now, which means that U11 and speaker are

good. Use oscillograph to test pin 14 of tuner MOINOIN and waveform is normal. This signal is coupled

through Ce134 to pin 73 of chip U111 (STV8216), after processing inside chip, output from pin 28, 29 of

U9 to U112 for amplifying output. Test pin 18, 19 and they are normal. Test pin 28, 19 and there is no

waveform output. From this , we decide that the chip U111 may probably have trouble. Test power supply

voltage of pin 20 and it is normal and crystal oscillation waveform output of chip is normal. Observe

carefully and find that pin 28, 29 has the possibility of rosin joint. Use iron to add tin and weld again. After

power on again, trouble is removed.

[ Example 5 ] symptom: tap machine slightly and picture has disturbance.

Trouble description: after power on, image display is normal and has white stripe flickering.

- 35 -

Analysis and troubleshooting: if there is disturbance after tapping machine, a certain or some

elements in circuit may probably be not contacted properly. According to trouble symptom, trouble lies in

the connecting board between display screen and main board. After checking machine flat cable, there

is no abnormality; then take down connecting board, check carefully and find that there is a certain

spring sheet in the socket on one end connecting with screen has sunk. Change connecting board flat

cable holder and trouble is removed.

[ Example 6 ] Symptom: black screen when power-on

Description: from standby to power-on, screen is black all the time and panel indicator light can

display normally.

Analysis and troubleshooting: according to servicing experience, if screen is black when power-on,

firstly place the head of oscillograph near high voltage of boost board and find that oscillograph has no

inductive waveform, so we can make sure that boost board has not outputted high voltage. Shown in the

figure 3.3.1.1, use multi-meter to test +12V power supply voltage of CN4 and it is normal. Use multi-

meter to test ON/OFF-INVERTER end and it is high level when in standby and low level in power-on in

normal conditions, test Q102 B-E and it is connected, so we doubt that triode Q102 has trouble; use

multi-meter diode level to test Q102 and triode Q102 has been stricken through. Change Q102 and

trouble is removed.

Figure 3.3.1.1 Inverter components control circuit

[ Example 7 ] Symptom: remote control has no function

Description: when pressing buttons on remote control, TV screen has no response.

Analysis and troubleshooting: test voltage of 5V-IR pin of Cn105 and it is +4.96, which is normal.

When power is not on, test elements of L148,R342 between pin 1 of CN105 and chip U101 and they are

all normal. Test pin 4 of remote control receiving board Cn801 to pin 1 of IR sensor and it is normally

connected. After power on, test voltage of pin 1 of CN105 and it is +4.98V, which is also normal. Press

- 36 -

Buttons on remote control and find that pin 1 voltage of CN105 has no change. Under normal conditions,

when pressing remote control, voltage changes from +4.98 to 3V plus several, which means remote

control information has been received, so trouble should be in remote control receiver. After changing,

trouble disappears.

[ Example 8 ] symptom: in AV input mode, video output end of SCART terminal has no vide signal output.

Trouble description: select signal source in AV state, switch on DVD Player to play demonstration

disc and screen has no picture. SCART is used to output signal to external TV and there is still no picture

display, but sound output is normal.

Analysis and troubleshooting: according to trouble symptom, we judge that trouble lies in video

output circuit. If video signals of LCD of this player are normal, it means external input circuit is normal.

After being processed by MST718, externally inputted video signals switch to digital video signals to

output to display screen; other signals output from pin 34 as analog signals to SCART terminal through

amplifying circuit to act as video output signals. Use oscillograph to observe

shown in the figure 3.3.1.2,

Ce108, there is no signal output, but the end that connects R42 and Q1 has signal output. Observe R2

carefully and the surface has leakage. After power off, use iron to heat R2 and then cut off. Change R2

with the same specification, trouble is removed.

figure 3.3.1.2 video out circuit diagram

[ Example 9 ] Symptom: speaker has no sound

Description: in any external input mode, there is no sound output.

Analysis and troubleshooting: set signal source in “AV" state, turn on DVD Player demonstration

disc and use oscillograph to test left/right speaker and find that there is no signal waveform output, so

we confirm trouble should appear in precious stage circuit. test pin 8, 17 input pin of U112(TDA7226)

and find that there is waveform input, but pin 9, 20 have no waveform output. Then test power supply

Loop and +12V voltage changes to +10.8V after voltage drops, which is normal. Observe whether pin

- 37 -

Around has rosin joint or false welding. Weld again and trouble exists, so it may be TDA7266 internal

processing circuit that has trouble. After changing U112, trouble disappears.

[ Example 10 ] Symptom: NICAM has no function

Description: press NICAN button on remote control and bilingual mode, stereo mode and mono

mode cannot be changed each other.

Analysis and troubleshooting: after receiving “NICAM" signal from tuner, NICAM outputs from pin

11, through the filtering circuit composed by C301,C302, L301, enters pin 73 of STV8216, and then

restores to audio signal through internal processing and then outputs to audio amplifying circuit from pin

28, 29, so firstly use oscillograph to test whether waveform of pin 11 (SIF) is normal.

Then test pin 73

signal of U111 after filtering and find that waveform is normal and there is input but no output, so we can

make sure U9 has trouble; test each power supply voltage and they are all normal. We confirm that

trouble lies in U111 and peripheral elements. Test IC power supply and voltage is normal. Use

oscillograph to test X301 and find that 27MHZ of X301 has no oscillation. After changing X301, crystal

oscillator has oscillation and trouble is removed.

[ Example 11 ]

symptom: TV cannot receive program

Trouble description: when TV is receiving program, there is no image output.

Analysis and troubleshooting: according to trouble symptom, we judge that trouble lies in tuner and

peripheral elements. Channel search is adjusted after the communication between IIC bus and main

chip MST718. Use oscillograph to observe pin 12 of tuner /CVBS and there is no waveform output, and

there should be 0.7V modulating waveform output on normal cases. Check pin 3, 13 of tuner and +5V

power supply and they are normal. Then check IIC bus waveform and it is normal. Check pin 11 and

there should be sine wave with frequency 6MH and 1V output in normal cases but there is no actually, so

we doubt tuner has trouble. Change tuner with the same specification, trouble is removed.

[ Example 12 ]

symptom: only one side of headphone has sound output

Trouble description: in any signal source, left and right channels of speaker output are normal. After

inserting headphone, left channel has no sound.

Analysis and troubleshooting: sound signals are amplified through TDA7266 after being outputted

by STV8216 and then return to speaker through headphone loop. When headphone is not inserted, left

and right channels of speaker are normal, so trouble lies in headphone loop obviously. Remove

headphone board, firstly check whether flat cable holder has joint welding or rosin joint and it is normal

after checking. Then check whether headphone holder contacts well and it is normal. Check resistor

R702, C705 on left channel loop one by one and find R702 resistance is infinite. Use iron to heat two

ends of R702 and surface has leakage after heating, and R702 has been damaged. Change elements

with the same specification, trouble is removed.

- 38 -

[ Example 13 ] Symptom: noise appears when power on

Trouble description: press POWER button on remote control or control board to power on and off

on each input mode and you may hear “pop” noise during the courses.

Analysis and troubleshooting: according to servicing experience, firstly check mute circuit when

this kind of trouble appears. Shown in the figure 3.3.1.3, when power on, MUTE signal changes from low

level to high level, and output high level through D120. When power off, ce151 outputs high level

through D121 and the diode D21, R71 inputted to mute control circuit are added to base electrode of

triode Q119 to make triode Q119 saturated on, now MUTE end is low level to realize power-on quieting

effect. Now there exists noise when power on and off, so we judge that trouble lies in Q119 and its

peripheral elements. After test, triode Q119 has been stricken through. Change the triode with the

relevant model and trouble is removed.

figure 3.3.1.3 mute circuit diagram

[ Example 14 ]

symptom: do not read USB

Trouble description: disc read is normal when in DVD state; after inserting USB, USB data cannot be

read out.

Analysis and troubleshooting: USB part is processed after being switched by electronic switch

ADG713 and then inputting to Mt1389. Firstly check whether channel is normal, from USB board to main

board through 22P flat cable cord and then to video main board, and this flat cable contact is bad. Firstly

check whether USBM, USBP are normally connected and whether there is short-circuit to ground. After

checking, USB board works normally. Then check lines on main board according to signal flow. USBP

passes through L158, so we judge that Mt1389 main chip cannot work normally. Check power supply of

each group and find that pin 49 USBVDD has no 3.3V voltage input. Check peripheral circuit and find

L191 has disconnected. Change L191 with the same specification and trouble is removed.

[ Example 15 ]

symptom: disc tray ejects out automatically

Trouble description: in DVD state, after loading disc, disc read is not available and disc tray ejects

out automatically.

- 39 -

Analysis and troubleshooting: when the above trouble appears, firstly check whether loader flat

cable has loosened. Check whether plug on loader flat cable has been oxidated and it is normal, so we

doubt loader has trouble. Change loader and trouble is removed.

[ Example 16 ]

symptom: left and right channels are not balanceable

Trouble description: sound of left speaker is lower than that of right channel

Analysis and troubleshooting: if channels are not balanceable, software setup may probably have

trouble. Firstly reset TV part, trouble does not disappear, so we can judge that trouble lies in hardware.

Disconnect power and check impedance of left/right speaker and it is normal. Test when machine begins

to play DVD test disc normally. Connect pin 4, 12 of TDA7266, use oscillograph to observe the amplitude

of left/right channel output of TDA7266 and left channel amplitude is smaller than that of right channel

(note: now ground of oscillograph is connected with OUT- and detect head is connected with OUT+), so

trouble lies in TDA7266. Change TDA7266 with the same specification and trouble is removed.

[ Example 17 ]

symptom: do not read disc

Trouble description: in DVD state, CD/DVD disc cannot be read and then disc ejects out

automatically.

Analysis and troubleshooting: check whether loader components flat cable contacts well and there

is no abnormality; remove loader flat cable and check whether the contact position of plug and loader

clasp has been oxidated. Change loader but trouble still exists, so trouble should lie in main board.

Power on, switch in DVD state, observe disc reading condition of loader and main axis, focus, feed,

trace action is normal, but disc type cannot detected. Observe focus carefully and find object lens

twitters greatly, but cannot form slim light spot to shine on disc, so trouble may probably lie in focus

circuit. Check pin 24, 25 of focus feedback loop Ba5954 and resistance value of R390 is normal. Use

iron to heat C162, trouble disappears, so capacitor loses effect. Change capacitor with the same

specification and trouble is removed.

[ Example 18 ]

symptom: no DVD image

Trouble description: other working state of machine is normal, but DVD function cannot be used

normally.

Analysis and troubleshooting: as for this kind of trouble, firstly judge whether trouble lies in DVD

function circuit. Check Mt1389 power supply and it is normal, Mt1389 clock and reset signals are normal,

so we doubt FLASH program loses. Power on, switch in DVD state and use oscillograph to observe

whether FLASH pin has waveform. Remove FLASH, record program again and trouble is removed.

[ Example 19 ]

symptom: colour distortion in DVD state

Trouble description: in DVD state, when playing CD/DVD disc, sound output is normal but colour is to

- 40 -

red with shadow.

Analysis and troubleshooting: if colour has distortion in DVD state, trouble may probably lie in

SDRAM or Mt1389 or on CVBS output line. Switch from DVD state to SCART state firstly, picture colour

is normal, so colour has distortion before MST718 input. CVBS outputs from Mt1389 and then enter

MST718 through frequency selection network for image processing, so trouble should lie in frequency

selection network. Power off, use multimeter to check whether each resistor and capacitor element has

resistance sudden change, and R395/75Ù has sudden change with only 15-ohm, which is caused by the

large attenuation of the signals outputted from DVD. Change resistor with the same specification and

trouble is removed.

[ Example 20 ]

symptom: do not read DVD disc

Trouble description: in DVD state CD playing is normal, DVD playing is not available and then DVD

disc ejects out automatically.

Analysis and troubleshooting: firstly check whether DVD protection point of loader has joint welding

phenomenon and there is no abnormality. Change loader and trouble still exits,

3.3.1.4,

so trouble lies in CD/DVD mode switch circuit. CD/DVD mode switch is controlled by pin 112 I/O

shown in the figure

port level of Mt1389 and VRCD and VRDVD switch is realized through selecting drive circuit. When disc

switches in CD and DVD, the switch of IOA in high and low level means that Mt1389 control port outputs

normally. When IOA is low level, TRDVD should be low level and it is high level actually. Check R187

and circuit has disconnected because of rosin joint. Use iron to weld again and confirm and trouble is

removed.

figure 3.3.1.4 circuit diagram CD/DVD mode switch

- 41 -

3.3.2 Troubleshooting flow chart

[ Flow chart 1 ] Trouble symptom: standby light is not on

Trouble description: connect with power, standby indicator light is not on, machine has no response

and buttons have no function.

Machine not power on

Whether

12V voltage

outputted by power

board is

normal

Y

Check

whether Cn6 pin 2

12Vvoltage is

normal

Y

Check

whether U503 pin 2

5V voltage is

normal

Y

Check

the power supply

loop from +5VEXT power

toMST718 is

normal

Y

Check

whether standby

control signal outputted

by MST718_57 is

normal

(Remark: Q117_C is low

Y

level in standby and high
level when working normally)

Check

whether Q117 is

normal

N

Check power board

N

Check flat cable from power
board to video main board

N

N

N

Change U503

Check power supply loop

Check

whether reset

signal of MST718

is normal

Check

whether X101 clock

signal is

normal

N

Check reset system circuit

Y

N

Check clock system circuit

Y

Check the standby indication
circuit on subsidiary board

Y

Change MST718

- 42 -

[ Flow chart 2 ] Symptom: power not on

Trouble description: test after machine power on, standby indicator light is not on and +12V power

outputted by power board is abnormal.

Power not on

Check fuse, TC1 and
rectifying bridge

Check NCP1207 and
peripheral elements

Change Q1

Check

whether power
board flat cable
has 12V voltage

Check according to
troubleshooting process
for“player not switch on”

N

Check

whether power

board TC1 has 310v

voltage

Y

N

Check

whether each pin

voltage of U1 is

normal

Y

N

Check

whether Q1 is

damaged

Y

N

Y

N

Check

whether 12v

resistor to ground

is normal

Y

Check

whether VD4

has secondary

voltage

Check whether filtering

N

capacitor TC3/TC4 has

electric leakage and

short-circuit

Y

Check

whether VD4

secondary voltage is

normal

N

Check feedback loop
U2/U3

Y

Check
whether voltage
of TC2 two ends

is normal

N

Change L3

Y

Change transformer

N

whether transformer

is normal

Check VD4

Check

END

Y

- 43 -

[ Flow chart 3 ] Symptom: no sound

Description: there is image, but no audio output

All input source has

no sound output

Y

Check

whether pin 28/29

of STV_8216 has signal

output

Y

Check

whether power

supply of power amplifier

board TDA7266 is

normal

Y

Check

whether TDA7266_6

pin is high level

Y

Check

whether audio output

pin waveform of

TDA7266P is

normal

Y

N

N

N

Check STV8216 and
peripheral elements

Check power supply loop
of TDA7266

Check mute control circuit

N

Change TDA7266P

Check speaker and line

- 44 -

[ Flow chart 4 ] Symptom: white screen

Description: screen is white and indicator on

White screen

Check

whether u502_D

voltage is

normal

Y

Check

whether 2.5V

voltage of pin 2 of

U507 is

normal

Y

Check

whether 3.3V

voltage outputted

by U505 is

normal

Y

Check

whether X101 clock

is normal

Y

N

whether u502_G pin is

low level

Change U502

N

N

Change U507

Change U505

N

Check X101/C103/C104

Check

Y

N

Check Q504 and peripheral
elements

Check

whether U15_37

(PANEL_ON) is low

level

Check

whether Q505_C is

high level

N

Change MST718

Y

N

Check Q505 and peripheral
elements

Y

Check

whether drive

output pin MST718

outputs

normally

Y

Check

whether the socket

and flat cable from main

board to display screen

are normal

Y

Change display screen

N

Change MST718

N

Change flat cable or socket

- 45 -

[ Flow chart 5 ] Symptom: DVD has no sound

Trouble description: when machine is set in DVD state, there is image but no sound. External input

and TV sound are normal.

In DVD state, playing is normal
and there is no sound output

Y

Check elements between
CE167/CE163 and U117

Check A12V power supply
loop

Check MT1389

N

N

whether pin 2/6

signal input of U117

is normal

N

N

Check

pin 8 power supply of

U117 is normal

Change U117

Check

Y

Y

N

Check

whether CE167/CE163

has audio signal

Y

N

Y

Y

Check

whether pin 1/7 of

U117 has audio signal

output

Y

Check

whether secondary

of TC166/CE165 has

audio signal

output

Y

Whether

pin 13/3 of U107

has signal

output

N

N

Check mute circuit

Check U107 and peripheral
elements

Y

Check

whether pin 23/24

audio input of U111 is

normal

N

Check the line between
U111 and U107

Change STV8216

- 46 -

Y

[ Flow chart 6 ] Symptom: black screen

Trouble description: after power on, screen has no display and backlight cannot be on

Black screen

After

power on, whether

indicator circuit working

is normal

Y

Check

whether CN103 pin 6

power supply is

normal

Y

Check

whether CN103_3 is

high level

Y

Check

whether boost
board has high
voltage output

Y

Change display screen

N

Check according to
troubleshooting flow of
“Machine cannot power on”

N

Check 12V power supply
loop

N

N

Change Q102

Check boost board

- 47 -

[ Flow chart 7 ] Symptom: DVD has no image

Description: DVD has no image but has sound.

DVD has no image

Y

Whether

machine switches in

DVD state

Y

whether L195/L196/L198

Check

has video signal

output

Y

Check

whether pin 13/15/17

of U106 has signal

output

Y

Check

whether pin 7/9/12

input signal of MST718

is normal

Y

N

Change machine setup

N

N

N

Check Mt1389 and
peripheral elements

Check U106 peripheral
elements

Check components video
input loop

Change MST718

- 48 -

[ Flow chart 8 ] Symptom: TV cannot search channels

Description: channel cannot be searched

T V cannot search channels

Check

whether tuner

has TUNER_CVBS

signal output

Y

Check

whether TUNER_CVBS

signal transmits

onto TVP5146

Y

Check SCL
and SDA data pin is normal

Check whether tuner power

N

and TV signal have input
and then change tuner

N

Check the path between
tuner to Mst718.

- 49 -

[ Flow chart 9 ] Symptom: player not power on

Description: switch on power, indicator light is not on and buttons have no function.

Player not power on

Check MST718 and
peripheral elements

Change Q117

N

button, whether 101_57

After

pressing OPEN

is high level

Y

N

Check

whether Q117 is normal

Y

Check standby indication
circuit

pressing POWER

N

button, whether panel

working indicator light

works correctly

Whether U503_1 is

Whether U503_2 is

Check

whether IC101 reset

is normal

After

12v

+5V

Y

N

Check 12V power supply
circuit

Y

N

Check U503 and
peripheral elements

Y

N

Check system
reset circuit

Y

Check

whether X101 clock

is normal

Change(IC101)

Y

MST718

N

Check system clock
circuit

- 50 -

[ Flow chart 10 ] symptom: NICAM has no function

Description: NICAM has no function and cannot be realized

NICAM has no function

Check

whether STV8216SIF

signal is

normal

Y

Check
whether clock
frequency
is normal

Y

Change STV8216

N

Check
whether clock
frequency
is normal

Y

Check the circuit between
tuner SIF signal and STV8216

N

Check crystal oscillator
resonance circuit

N

Change tuner

- 51 -

[ Flow chart 11 ] Symptom: screen image flickers

Description: screen image flickers and sound is normal

Screen image flickers

Check

whether screen

flickers under other

signal source

Y

Judge

whether it is the

back ground

light that

flashes

Y

Change

inverter and check

whether it restores to

be normal

Y

Whether socket has 12v
voltage

N

Check whether software
version is correct

N

Check whether display screen
flat cable contact is good

N

Check whether there is +12v
voltage that outputs to inverter

- 52 -

[ Flow chart 12 ] Symptom: colour has distortion

Description: picture colour has distortion

Colour has distortion

Y

Check

whether the TTL

output signal of

MST718 is

normal

Y

Check
whether 3*8bit
digital signal of
Cn1 is normal

Y

Check

whether CN1 has

rosin joint, false welding

and disconnected

pin

Y

Check

whether video flat

cable is

disconnected

Y

N

N

N

N

Check
whether clock
frequency is
normal

Change MST7118

Check the path between
MST718 and Cn1

Weld again and change
socket

Change video flat cable

N

Check X101/C103/C104

Y

Check

whether connecting

board has rosin joint and

whether socket has

disconnected

pin

Y

Check again

N

Change display screen

- 53 -

Section Four Waveform diagram

This section collects signal waveform diagram of audio, video and each unit circuit with the purpose

to help servicing personnel to judge where trouble lies in accurately and quickly to improve servicing

skills. For the difference of oscillograph's type, model and tuner, a certain difference may exist, so the

servicing personnel are expected to pay more attention to check in daily operation.

1. System reset signal waveform diagram: waveform comparison diagram for +5EXT and system

reset pin during the course of power on.

MST RESET

5VEXT

2. U104_2(SO) waveform diagram:

- 54 -

3. U104_1 (CE) gating signal waveform diagram

4. U104_6 (SCK) clock signal input waveform diagram

5. U104_5 (SI) data input pin waveform diagram

- 55 -

6. MST718 clock signal waveform diagram: waveform diagram when X101 is working (frequency

12MHZ)

7. Q1_C:video signal waveform diagram for pin when machine is receiving Q1_C standard signal

source in TV mode.

8. U103_6: waveform diagram of SCL in IIC bus

- 56 -

9. U103_5:waveform diagram of SDA in IIC bus

10. TV audio signal waveform diagram: waveform diagram for audio signals outputted by U114_14

pin when machine is receiving standard signal source in TV mode.

11. TV video signal waveform diagram: waveform diagram for video signals outputted by U114_12

pin when machine is receiving standard signal source in TV mode.

- 57 -

12. U001_12:waveform diagram for video signals outputted by pin 12 of tuner when machine is

receiving TV signal in TV mode.

13. U001_11:output waveform diagram of NICAM output pin

14. NICAM processing circuit clock signal waveform diagram: waveform diagram when :X301 is

working (frequency 27MHZ).

- 58 -

15. CN1_11 display screen drive clock signal waveform diagram

16. CN1_12 display screen enable control end waveform diagram

17. CN1_12 waveform diagram of VSYNC signal outputted by MST718

- 59 -

18. CN1_16 HSYNC signal waveform diagram.

19. waveform diagram of DR signal outputted by TTL (test point is CN1_19 and test machine when

setting in DVD state)

20. waveform diagram of DG signal outputted by TTL (test point is CN1_29 and test machine when

setting in DVD state)

- 60 -

21. waveform diagram of DB signal outputted by TTL (test point is CN1_39 and test machine when

setting in DVD power-on picture state)

22. 8216_28:waveform diagram after the audio signals from tuner are processed by STV8216 and

then output from pin 28/29 when machine is receiving standard signal source in TV mode.

23. 8216_1:waveform diagram after audio signals from tuner are processed by STV8216 and output

from pin 1/2 when machine is receiving standard signal source in TV mode.

- 61 -

24. 8216_18: when machine is in DVD state, audio signals outputted by Mt1389 output from pin

18/19 after being processed by CD4052/STV8216.

25. PANEL_ON: waveform comparison diagram for STBY and PANEL_ON signal when machine

enters from standby to power-on.

STBY

26. INVERTER:waveform comparison diagram for STBY and ON/OFF_INVERTER signal when

machine enters from standby to power-on.

- 62 -

Voltage

Voltage

10

11

12

13

14

15

16 WE

17

18

19

20

Section Five Function Introduction to IC

3.5.1 function introduction to SDRAM(HY57V641620HGT-7 )U301

The function of SDRAM (U301) in the player is to save program taken out by Mt1389 from FLASH and
information of picture and sound taken out from disc when the player is working to form damping, add the
stability of information output and add anti-vibration of the player. The pin function and real voltage are shown
as the following table:

Pin Name

1 VDD 3.3V power supply 　 3.18 28 VSS Ground 　 0.01

2 DQ0 Data bus I/O 0.94 29 MA4 Address bus I 1.65

3 VDDQ 3.3V power supply I/O 3.19 30 MA5 Address bus I 1.74

4 DQ1 Data bus I/O 0.9 31 MA6 Address bus I 1.49

5 DQ2 Data bus I/O 1.3 32 MA7 Address bus I 1.22

6 VSSQ Ground 　

7 DQ3 Data bus I/O 1.2 34 MA9 Address bus I 0.04

8 DQ4 Data bus I/O 1.5 35 MA11 Address bus I 0.04

9 VDDQ 3.3V power supply 　 3.18 36 NC Blank pin 　 0.01

DQ5 Data bus I/O 0.7 37 CKE Clock enable signal I 1.22

DQ6 Data bus I/O 0.45 38 CLK System clock input I 1.68

VSSQ Ground 　

Function

Data

direction

when

no disc

Pin Name

0 33 MA8 Address bus I 0.05

0 39 UDQM Data in/out screen-shielded signal I 2.42

Function

Data

when

direction

no disc

DQ7 Data bus I/O 0.8 40 NC Blank pin 　 0.01

VDD 3.3V power supply 　 3.14 41 VSS Ground 　 0.01

LDQM Data in/out screen-shielded signal I 2.46 42 DQ8 Data bus I/O 0.6

Write control signal I 3.17 43 VDDQ 3.3V power supply 　 3.19

CAS Line address gatig signal I 3.01 44 DQ9 Data bus I/O 0.91

RAS Row address gating signal I 3.13 45 DQ10 Data bus I/O 0.8

CS Chip selection signal I 2.95 46 VSSQ Ground 　 0.01

SD-BS0 Section address 0 gating signal

I 1.8 47 DQ11 Data bus I/O 0.79

- 63 -

21 SD-BS1 Section address 1 gating signal I 2 48 DQ12 Data bus I/O 1.16

22

23

24

25

26

27

MA10 Address bus I 0.04 49 VDDQ 3.3V power supply 　 3.19

MA0 Address bus I 0.36 50 DQ13 Data bus I/O 1.15

MA1 Address bus I 0.35 51 DQ14 Data bus I/O 1.24

MA2 Address bus I 2.38 52 VSSQ Ground 　 0.01

MA3 Address bus I 1.59 53 DQ15 Data bus I/O 0.68

VDD 3.3V power supply 　 3.19 54 VSS Ground 　 0.01

3.5.2 Function introduction to STV8216(u111)

1. Description

TV Sound Demodulator: provides all the necessary circuitry for the demodulation of audio transmissions
of European and Asian terrestrial TV broadcasts. The various transmission standards are automatically
detected and demodulated without user intervention.

Audio Processor: based on DSP technology, independently controls loudspeaker, subwoofer and
headphone signals. It offers basic and advanced features, such as a ST Wide Surround, Equalizer, Automatic
Loudness and Smart Volume Control for television viewer comfort. The STV8226/36 versions can perform
additionally the SRS 3D Surround for stereo and mono signals.

Audio Matrix: 3 stereo and 1 mono external analog audio inputs to loudspeakers and headphone, with 2
stereo external analog audio outputs (SCART compatible).

2. Feature

# NICAM, AM, FM Mono and FM 2 Carrier Stereo Demodulators for all sound carriers between 4.5 and 7

MHz
# Spatial Sound Effects (ST Wide Surround and Pseudo-Stereo)
# Mono input provided for optimum AM Demodulation performances
# Subwoofer output with Volume Control and Programmable Bandwidth
# Demodulation controlled by Automatic Standard Recognition System
# Loudspeaker and Headphone outputs with Volume/Balance Controls and Beeper
# Sound IF AGC with wide range
# Overmodulation and Carrier Offset recovery
# Smart Volume Control
# 5-band Equalizer & Bass/Treble Control
# SRS® 3D Surround
# 3-to-2 Analog Stereo Audio I/Os (SCART compatible) with Audio Matrix
# Low-noise Audio Mutes and Switches

- 64 -

# I²S Output to interface with Dolby® ProLogic® Decoder
# Automatic Loudness Control
# I²C Bus-controlled
# Single and standard 27 MHz Crystal Oscillator
# Embedded 3.3 V Regulators
# Power supplies: 3.3 V Digital, 5 V or 8 V Analog
# I = Input
# O = Output
# OD = Open Drain
# B = Bidirectional
# A = Analog
# AP = Analog Power Supply
# DP = Digital Power Supply

3. Pin Definitions

PIN Name Type Function

1 AO1L A Left SCART1 Audio Output

2 AO1R A Right SCART1 Audio Output

3 NC Not Used

4 NC Not Used

5 NC Not Used

6 NC Not Used

7 VDDC AP 3.3 V Power Supply for Audio DAC/ADC

8 GNDC AP 0 V Power Supply for DAC/ADC

9 AI1L A Left SCART1 Audio Input

10 AI1R A Right SCART1 Audio Input

11 VMC1 A Switched VREF Decoupling Pin for Audio Converters (VMCP)

13 VMC2 A VREF Decoupling Pin for Audio Converters (VMC)

14 AI2L A Left SCART2 Audio Input

15 AI2R A Right SCART2 Audio Input

16 VDDA AP 3.3 V Power Supply for Audio Buffers, Matrix & Bias

17 GNDAH AP 0 V Power Supply for Audio Buffers & SCART

18 AO2L A Left SCART2 Audio Output

19 AO2R A Right SCART2 Audio Output

20 VDDH AP 8 V / 5 V Power Supply for SCART & Audio Buffers

- 65 -

21 NC Not Used

22 VREFA A Voltage Reference for Audio Buffers

23 AI3L A Left SCART3 Audio Input

24 AI3R A Right SCART3 Audio Input

25 N/C Not Used

26 BGAP A Bandgap Voltage Source Decoupling

27 N/C Not Used

28 LSL A Left Loudspeaker Output

29 LSR A Right Loudspeaker Output

30 SW A Subwoofer Output

31 HPL A Left Headphone Output

32 HPR A Right Headphone Output

33 GNDSA AP Substrate Analog/Digital Shield

34 N/C Not Used

35 HPD B Headphone Detection Input (Active Low)

36 ADR I Hardware I²C Chip Address Control

37 N/C Not Used

38 N/C Not Used

39 SCL OD I²C Serial Clock

40 SDA OD I²C Serial Data

41 N/C Not Used

42 REG A 5 V Power Regulator Control

43 RESET I Hardware Reset (Active Low)

44 SYSCK B System Clock Output

45 MCK B I²S Master Clock Output

46 VDD1 DP 3.3V Power Supply for Digital Core & IO Cells

47 GND1 DP 0V Power Supply for Digital Core & IO Cells

48 N/C Not Used

49 GNDSP AP Substrate Analog/Digital Shield for Clock-PLL

50 N/C Not Used

51 N/C Not Used

52 XTI I Crystal Oscillator Input

53 XTO O Crystal Oscillator Output

- 66 -

54 VDDP AP 3.3 V Power Supply for Analog PLL Clock

ADC VTOP Decoupling Pin

AGC Voltage Referen

55 GNDP AP 0 V Power Supply for Analog PLL Clock

56 GND2 DP 0 V Power Supply for Digital Core, DSPs & IO Cells

57 VDD2 DP 3.3 V Power Supply for Digital Core, DSPs & IO Cells

58 CKTST I Must be Connected to 0 V

59 N/C Not Used

60 N/C Not Used

61 SDO B I²S Bus Data Output

62 ST/SDI B Stereo Detection Output / I²S Bus Data Input

63 WS B I²S Bus Word Select Output

64 SCK B I²S Bus Clock Output

65 BUS1 B I²C Bus Expander Output 1

66 N/C Not Used

67 N/C Not Used

68 BUS0 B I²C Bus Expander Output 2

69 IRQ B I²C Status Read Request

70 N/C Not Used

71 N/C Not Used

72 N/C Not Used

73 SIF A Sound IF Input

74 VTOP A

75 VREFIF A

76 VDDIF AP 3.3 V Power Supply for IF AGC & ADC

77 GNDIF AP 0 V Power Supply for IF AGC & ADC

78 MONOIN A Mono Input

79 NC Not Used

80 NC Not Used

ce Decoupling Pin

3.5.3 Function introduction to MST718

1. Description
The MST718BE is a high quality ASIC for NTSC/PAL/SECAM LCD-TV application. It receives analog

NTSC/PAL/SECAM CVBS and S-Video inputs from TV tuners, DVD or VCR sources, including weak and
distorted signals, as well as analog RGB input from GPS systems. Automatic gain control (AGC) and 10-bit

- 67 -

3-channel A/D converters provide high resolution video quantization. With automatic video source and mode
detection, users can easily switch and adjust variety of signal sources. Multiple internal adaptive PLLs
precisely extract pixel clock from video source and perform sharp color demodulation. Built-in line-buffer
supports adaptive 2-D comb-filter, 2-D sharpening, and synchronization stabler in a condense manner. The
output format of MST718BE supports 8-bit TTL or LVDS digital TFT-LCD modules.

2. FEATURES

# Video Decoder
# Supports NTSC, PAL and SECAM video input formats
# 2D NTSC and PAL comb-filter for Y/C separation of CVBS input
# Multiple CVBS and S-video inputs
# Supports Closed-caption and V-chip
# Supports Teletext 1.5
# ACC, AGC, and DCGC (Digital Chroma Gain Control) Analog Input
# Supports RGB input format from PC, camcorders and GPS
# Supports YCbCr inputs from conventional video source and HDTV
# Supports SCART – RGB + Fast Blank
# Supports video input 480i, 480p, 576i, 576p,720p, 1080i; RGB input resolution in 640x480, 800x480,

800x600, 1024x768, and 1280x1024(SXGA)

# 3-channel low-power 10-bit ADCs integration for YCbCr and RGB
# Supports RGB composite sync input (CSYNC), SOY, SOG, HSYNC, and VSYNC
# On-chip clock synthesizer and PLL
# Auto-position adjustment, auto-phase adjustment, auto-gain adjustment, and auto-mode detection

?？ Color Engine
# Brightness, contrast, saturation, and hue adjustment
# 9-tap programmable multi-purpose FIR (Finite Impulse Response) filter
# Differential 3-band peaking engine
# Vertical peaking
# Spatial noise reduction
# Luminance Transient Improvement (LTI)
# Chrominance Transient Improvement (CTI)
# Black Level Extension (BLE)
# White Level Extension (WLE)
# Favor Color Compensation (FCC)
# 3-channel gamma curve adjustment
# Independent 6 color of saturation, hue, and brightness contro
# ?Scaling Engine/Panel Interface

- 68 -

# Supports digital panels up to 1366x768, and 1440x900
# Supports single/dual 8-bit LVDS panel outputs
# Supports 8-bit TTL panel output
# Supports various displaying modes
# Supports horizontal panorama scaling ? ？ Miscellaneous
# Built-in MCU
# 3-wire serial bus interface for configuration setup
# Built-in step-down PWM circuits for input 2.5V
# Built-in internal OSD with 512 programmable fonts, 1、2 or 4 bit per pixel color, 16-color palettes, and

12-bit color resolution

# Supports external OSD
# Support CVBS out
# Spread spectrum clocks
# Optional 3.3V / 5V output pads with programmable driving current
# 128-pin PQFP package

3. PIN DESCRIPTION

Pin Pin Name Pin Type Function

2 VMID 　 Mid-Scale Voltage Bypass

3 VCLAMP 　 CVBS/YC Mode Clamp Voltage Bypass

4 REFM 　 Internal ADC Bottom De-coupling Pin

5 REFP 　 Internal ADC Top De-coupling Pin

7 PRINP Analog Input Analog Pr Input of HDTV

8 PRINM Analog Input Reference Ground for Analog Pr Input of HDTV

9 PBINP Analog Input Analog Pb Input of HDTV

10 PBINM Analog Input Reference Ground for Analog Pb Input of HDTV

11 SOY Analog Input Sync-on-Y slicer input

12 YINP Analog Input Analog Y Input of HDTV

13 YINM Analog Input Reference Ground for Analog Y Input of HDTV

14 BINP Analog Input Analog B Input of VGA

15 BINM Analog Input Reference Ground for Analog B Input of VGA

16 SOGIN Analog Input Sync-on-Green slicer input

17 GINP Analog Input Analog G Input of VGA

18 GINM Analog Input Reference Ground for Analog G Input of VGA

- 69 -

19 RINP Analog Input Analog R Input of VGA

tolerant

tolerant

tolerant

20 RINM Analog Input Reference Ground for Analog R Input of VGA

22 C1INP Analog Input Analog Chroma Input for TV S-Video1 / Analog Composite Input of TV CVBS4

23 C1INM Analog Input

24 YS1INP Analog Input Analog Luma Input of TV S-Video1 / Analog Composite Input of TV CVBS3

25 YS1INM Analog Input

26 C2INP Analog Input Analog Chroma Input for TV S-Video2

27 C2INM Analog Input Reference Ground for Analog Chroma Input of TV S-Video2

28 YS2INP Analog Input Analog Luma Input of TV S-Video2

29 YS2INM Analog Input Reference Ground for Analog Luma Input of TV S-Video2

30 CVBS1P Analog Input Analog Composite Input for TV CVBS1

31 CVBS1M Analog Input Reference Ground for Analog Composite Input of TV CVBS1

32 CVBS2P Analog Input Analog Composite Input for TV CVBS2

33 CVBS2M Analog Input Reference Ground for Analog Composite Input of TV CVBS2

116 VREXT_CDAC

Analog Input Reference Current Generator, 820 ohm to Ground

Reference Ground for Analog Chroma Input of TV S-Video1 / Analog Composite

Input of TV CVBS4

Reference Ground for Analog Luma Input of TV S-Video1 / Analog Composite

Input of TV CVBS3

125 HSYNCIN1

124 VSYNCIN1

123 HSYNCIN2

122 VSYNCIN2

Pin Pin Name Pin Type Function

77 CLKO Output Display Clock Output

78 DEO Output Display Enable Output

79 VSYNCO Output Vertical Sync Output

80 HSYNCO Output Horizontal Sync Output

108 BOUT[7]/LVB0M

Schmitt Trigger

HSYNC / Composite Sync for VGA Input 1

Input w/ 5V-

Schmitt Trigger

VSYNC for VGA Input 1

Input w/ 5V-

Schmitt Trigger

HSYNC / Composite Sync for VGA Input 2

Input w/ 5V-tolerant

Schmitt Trigger

VSYNC for VGA Input 2

Input w/ 5V-

Digital Panel Output Interface

Blue channel Output [7] / LVDS B-Link Channel 0 Negative Differential Data

Output

Output

- 70 -

107 BOUT[6]/LVB0P

Link Channel 0 Positive Differential Data Output

Link Channel 1 Positive Differential Data Output

Link Channel 2 Positive Differential Data Output

ve Differential Data Output

Link Channel 3 Positive Differential Data Output

Output Blue channel Output [6] / LVDS B-

106 BOUT[5]/LVB1M

105 BOUT[4]/LVB1P

104 BOUT[3]/LVB2M

103 BOUT[2]/LVB2P

102 BOUT[1]/LVBCKM

101 BOUT[0]/LVBCKP

99 GOUT[7]/LVB3M

98 GOUT[6]/LVB3P

97, 96

95 GOUT[3]/LVA0M

GOUT[5:4] Output Green channel Output [5:4]

Output

Blue channel Output [5] / LVDS B-Link Channel 1 Negative Differential Data

Output

Output Blue channel Output [4] / LVDS B-

Blue channel Output [3] / LVDS B-Link Channel 2 Negative Differential Data

Output

Output

Output Blue channel Output [2] / LVDS B-

Output Blue channel Output [1] / LVDS B-Link Negative Differential Clock Output

Output Blue channel Output [0] / LVDS B-Link Positive Differential Clock Output

Green channel Output [7] / LVDS B-Link Channel 3 Negative Differential Data

Output

Output

Green channel Output [6] / LVDS B-Link Channel 3 Positive Differential Data

Output

Output

Green channel Output [3] / LVDS A-Link Channel 0 Negative Differential Data

Output

Output

94 GOUT[2]/LVA0P

93 GOUT[1]/LVA1M

92 GOUT[0]/LVA1P

91, 90

89 ROUT[5]/LVA2M

88 ROUT[4]/LVA2P

87 ROUT[3]/LVACKM

86 ROUT[2]/LVACKP

85 ROUT[1]/LVA3M

84 ROUT[0]/LVA3P

ROUT[7:6] Output Red channel Output [7:6]

Output

Green channel Output [2] / LVDS A-Link Channel 0 Positive Differential Data

Output

Green channel Output [1] / LVDS A-Link Channel 1 Negative Differential Data

Output

Output

Green channel Output [0] / LVDS A-Link Channel 1 Positive Differential Data

Output

Output

Red channel Output [5] / LVDS A-Link Channel 2 Negative Differential Data

Output

Output

Output Red channel Output [4] / LVDS A-Link Channel 2 Positi

Output Red channel Output [3] / LVDS A-Link Negative Differential Clock Output

Output Red channel Output [2] / LVDS A-Link Positive Differential Clock Output

Red channel Output [2] / LVDS A-Link Channel 3 Negative Differential Data

Output

Output

Output Red channel Output [0] / LVDS A-

Pin Pin Name Pin Type Function

73 OSDR/GPIO_P30 I/O w/ 5V-tolerant

External OSD Interface

- 71 -

DVD clock signal(DVSCK)

74 OSDG/GPIO_P31 I/O w/ 5V-tolerant

tolerant

tolerant

tolerant

Display screen working power control pin (PANELON)

75 OSDB/GPIO_P32 I/O w/ 5V-tolerant

76 FB/GPIO_P33 I/O w/ 5V-tolerant

Switching Power and PWM Interface

Pin Pin Name Pin Type Function

38 PWMOUT2 Output Switching Pulse Output for DC-DC Converter (NC)

39 FB2 Analog Input Error Voltage Feedback Input Pin for PWM2; voltage = 1.2V (NC)

40 SENSE2 Analog Input Sense Circuit Connection for PWM2 (NC)

41 PWMOUT1 Output Switching Pulse Output for DC-DC Converter (NC)

42 FB1 Analog Input Error Voltage Feedback Input Pin for PWM1; voltage = 1.2V (NC)

43 SENSE1 Analog Input Sense Circuit Connection for PWM1 (NC)

44 PGOOD Output Power Good Indicator (NC)

Internal MCU Interface with Serial Flash Memory

Pin Pin Name Pin Type Function

49 SAR2 Analog Input Connect pull-up resistor externally

Software program protection control pin (24WP)

Boost board control (INVERTERON/OFF)

48 SAR1 Analog Input Button control input

47 SAR0 Analog Input Button control input

52 SCK Output SPI Interface CLOCK-In (SPICK)

53 SDI Output SPI Interface Data-In (SPIDI)

54 SDO Input w/ 5V-

55 CSN Output SPI Interface Chip Select (SPICZ)

58-64, 83

GPIO_P00-GPIO_P0

7

65 INT Input Interrupt Input for IR Receiver

66 SDA I/O w/ 5V-tolerant

67 SCL Input w/ 5V-

POWER_ON_RSTN/
68

CS

I/O w/ 5V-tolerant

Input w/ 5V-

MCU control jack (IIC bus, connect with the serial input line of CD4094)

Power On Reset Signal/Chip Selection for 3-wire Serial

Misc. Interface

SPI Interface Data-Out (SPIDO)

3-Wire Serial Bus Data

3-Wire Serial Bus Clock

Pin Pin Name Pin Type Function

Schmitt Trigger

72 RESET

Input w/

5V-tolerant

- 72 -

Hardware Reset; active high

121 XIN Analog Input

GPIO_P24/PWMD3

GPIO_P25/PWMD4

Crystal Oscillator Input

120 XOUT Analog Output

56

57

70 PWMD2 Output NC

71 PWMD1 Output NC

100 INT_OUT Output NC

34, 115 CVBSO1/CVBSO2

109 MCUSEL Input Embedded MCU selection. 0: MCU on. 1: MCU off.

6, 21

35 AVDD_GMC 5V Power GMC Power

37 AVDD_PWM 5V Power PWM Power

113 AVDD_OPLL 2.5V Power OPLL Power

117 AVDD_CDAC 2.5V Power Current DAC Power

118 AVDD_XTAL 5V Power XTAL Power

AVDD_ADC 2.5V Power ADC Power

Output Software protection control signal jack

Output Standby control output end

Output Analog Composite Output for TV CVBS1/CVBS2

Crystal Oscillator Output

127 AVDD_MPLL 2.5V Power MPLL Power

50, 110

46, 82

1, 36, 45,

51, 69, 81,

111, 112,
114, 119,
126, 128

VDDC 2.5V Power Digital Core Power

VDDP 3.3V/5V Power

GND Ground Ground

Digital Input/Output Power

3.5.4 function introduction to CD4052

1. Description

The CD4052B (u107) analog multiplexers is digitally-controlled analog switches having low ON
impedance and very low OFF leakage current. Control of analog signals up to 20VP-P can be achieved by
digital signal amplitudes of 4.5V to 20V (if VDD-VSS = 3V, a VDD-VEE of up to 13V can be controlled; for
VDD-VEE level differences above 13V, a VDD-VSS of at least 4.5V is required). For example, if VDD = +4.5V,
VSS = 0V, and VEE = -13.5V, analog signals from -13.5V to +4.5V can be controlled by digital inputs of 0V to
5V. These multiplexer circuits dissipate extremely low quiescent power over the full VDD-VSS and VDD-VEE
supply-voltage ranges, independent of the logic state of the control signals. When a logic “1” is present at the

- 73 -

inhibit input terminal, all channels are off.

The CD4052B is a differential 4-Channel multiplexer having two binary control inputs, A and B, and an
inhibit input. The two binary input signals select 1 of 4 pairs of channels to be turned on and connect the
analog inputs to the outputs.

2. FEATURES
# Wide Range of Digital and Analog Signal Levels

Digital: 3V to 20V

Analog: ≤20VP-P
# Low ON Resistance, 125W (Typ) Over 15VP-P Signal Input Range for VDD-VEE = 18V
# High OFF Resistance, Channel Leakage of ±100pA (Typ) at VDD-VEE = 18V
# Logic-Level Conversion for Digital Addressing Signals of 3V to 20V (VDD-VSS = 3V to 20V) to Switch

Analog Signals to 20VP-P (VDD-VEE = 20V)
# Matched Switch Characteristics, rON = 5W (Typ) for VDD-VEE = 15V
# Very Low Quiescent Power Dissipation Under All Digital-Control Input and Supply Conditions, 0.2mW

(Typ) at VDD-VSS = VDD-VEE = 10V
# Binary Address Decoding on Chip
# 5V, 10V and 15V Parametric Ratings
# 10% Tested for Quiescent Current at 20V
# Maximum Input Current of 1mA at 18V Over Full Package Temperature Range, 100nA at 18V and 25℃
# Break-Before-Make Switching Eliminates Channel Overlap

3. Pin Definitions

Pin Name Function I/O

1、2、4、5

11、12、14、15

3、13

6 INH Two groups have no output when two ends are high level I

7 VEE -12V power (grounding)

8 VSS ground

16 VDD +5V power

Y0-Y3 Y signal input I

X0-X3 X signal input I

Y Y signal output O

9、10 B、A

13 X X signal output O

Strobe signal I

- 74 -

3.5.5 function introduction to TDA7266D

1. FEATURES
# WIDE SUPPLY VOLTAGE RANGE (3.5 - 12V)
# OUTPUT POWER

5+5W @THD = 10%, RL = 8 , V？ CC = 9.5V
# SINGLE SUPPLY
# MINIMUM EXTERNAL COMPONENTS

– NO SVR CAPACITOR

– NO BOOTSTRAP

– NO BOUCHEROT CELLS

– INTERNALLY FIXED GAIN
# STAND-BY & MUTE FUNCTIONS
# SHORT CIRCUIT PROTECTION
# THERMAL OVERLOAD PROTECTION

2. PIN CONNECTION

SN Name Pin function SN Name Pin function

1 OUT1+ Audio output + 9 S-GND Ground wire

2 OUT1- Audio output - 10 NC NC

3 VCC Power input 11 NC NC

4 IN1 Audio input 12 IN2 Audio input2

5 NC NC 13 VCC Power input

6 MUTE Mute control 14 OUT2- Audio output-

7 ST-BY Standby control 15 OUT+ Audio output +

8 PW-GND Ground wire

3.5.6 function introduction to FSAV433

1. Description
The FSAV433 is an ultra low power high bandwidth video switch specially designed for the switching of

three analog video signals, including computer RGB and high definition YPbPr signals.

The wide bandwidth (550MHz) of this switch allows signal passage with minimum edge and phase

distortion while 70Db non?adjacent channel crosstalk generates negligible image noise between active
channels. Optimized differential gain and differential phases maintain the image integrity of video applications
while low On Resistance offers low signal insertion loss.

- 75 -

2. Pin Descriptions

Pin Name Description Pin Name Description

OE Bus Switch Enable

S1, S2 Select Input

A Bus A

B1–B3

Bus B

3. Truth Table

S1 S2 Function H L A = B2

L L Disconnect H H A = B3
L H A = B1

3.5.7 function introduction to HEF4094B

1. DESCRIPTION

The HEF4094B is an 8-stage serial shift register having a storage latch associated with each stage for strobing

data from the serial input to parallel buffered 3-state outputs O0 to O7. The parallel outputs may be connected
directly to common bus lines. Data is shifted on positive-going clock transitions. The data in each shift register stage
is transferred to the storage register when the strobe (STR) input is HIGH. Data in the storage register appears at
the outputs whenever the output enable (EO) signal is HIGH. Two serial outputs (Os and O’s) are available for
cascading a number of HEF4094B devices. Data is available at Os on positive-going clock edges to allow
high-speed operation in cascaded systems in which the clock rise time is fast. The same serial information is
available at O’s on the next negative-going clock edge and provides cascading HEF4094B devices when the clock
rise time is slow.

2. FUNCTION TABLE

INPUTS PARALLEL OUTPUTS

CP EO STR D O0 On Os O’s

L X X Z Z O’6 nc

L X X Z Z nc O7

H L X nc nc O’6 nc

H H L L On-1 O’6 nc

H H H H On-1 O’6 nc

H H H nc nc nc O7

SERIAL OUTPUTS

Notes:

1. H = HIGH state (the more positive voltage)

- 76 -

2. L = LOW state (the less positive voltage)

3. X = state is immaterial

4.↗ = positive-going transition

5.↘ = negative-going transition

6. Z = high impedance off state

7. nc = no change

8. O’6 = the information in the seventh shift register stage

- 77 -

Section Three Servicing and Principle

SN Material code Material name Specs & Model Qty Position Number Function

1 882644 IC MT1389FE/H(HD EDITION) QFP 1 U115 DVD decode chip

2 880768 IC C4558 SOP 1 U117 DVD audio amplifying

3 881378 IC BA5954FP HSOP 1 U118 Servo drive IC

4 881604 IC AT24C16 SOP 1 U303 DVD EEPROM

5 911958

Software
program

ROMLD2006SI2-0A(16M) 1 U302 DVD software program

The next manual: DVD part

Section One Principle of the player

3.1.1 Introduction to the player

Electronic scheme of LD2006SI-2 adopts LCD components (LC201V02-SDB1 20" )+inverter

components (INV607)+MST518VA+TVP5146M1+STV8216+TDA7266P+tuner JS-6B2/121+CPU

(W79E632A40PN ), which support PAL BG/DK/I SECAM BG/DK/L/L RF signal modulating,

PAL/NTSC/SECAM/PAL60 multi-system video signals, BG/DK/I/LL/L accompanying system’s FM,

NICAM, A2 Stereo signal modulating and accompanying restore and external input SCART S-VIDEO

composite video input mode. This model is composed of power, boost components, power switch board,

main board, button board and remote control receiving board.

3.1.2 Introduction to IC used by the player

- 78 -

Section Two Unit Circuit Principle

Pin Name Signal flow direction DVD disc CD disc No disc Function description

1 F- Input loader 2.52 2.34 0.46

2 F+ Input loader 2.49 2.49 0.93

3 T+ Input loader 2.53 2.51 0.94

4 T- Input loader 2.58 2.51 0.93

5 C Input MT1389 2.2 2.25 2.04 Disc data signal

6 D Input MT1389 2.2 3.2 2.04 Disc data signal

7 IOA Input MT1389 0.01 3.2 3.21 Disc identification signal, CD is 3.3V, DVD is 0V

8 RF Input MT1389 2.21 2.53 1.28 The sum of disc data signal

9 A Input MT1389 2.17 2.22 2.04 Disc data signal

10 B Input MT1389 2.19 2.27 2.04 Disc data signal

11 F Input MT1389 2.07 2.44 2.03 Supplementary signal used in trace

12 GND Ground 0.01 0.01 0 Grounding

13 V20 Input loader 2.04 2.06 2.03 Reference voltage

14 Vcc Input loader 5.04 5.04 5.02 Supply voltage for loader

15 E Input MT1389 2.06 2.45 2.03 Disc data signal

16 Blanking haning in air 0.01 0 0 unused

17 VR-CD Input loader 0.21 0.01 0

Through the handling inside loader, make sure

MD11 is 180mV when reading CD

18 VR-DVD Input loader 0.01 0.2 0

Through the handling inside loader, make sure

MD11 is 180mV when reading DVD

19 LD-CD Input loader 0.09 2.1 0 CD laser power control signal

20 MDII Input MT1389 0.21 0.2 0 CD and DVD laser power monitoring signal

Focus error signal is added to two sides of pick -

up focus coil

Trace error signal is added to two sides of pick-up

trace coil

3.2.1 Introduction to laser head

Function introduction to laser head flat cable is shown as the following table:

- 79 -

Note: 1) When reading DVD, there are only A, B, C, D signals.

21 HFM Input loader 5.04 5.04 5.02

High frequency overlapping signal produces laser

with different wave length inside loader

22 Blanking unused 0.01 0.1 0

23 LD-DVD Input loader 2.21 0.1 0 DVD laser power control signal

24 GND unused 0.01 0.01 0 Grounding

2) When reading CD, there are A, B, C, D, E, F signals.

3) RFO=A+B+C+D.

4) Focus error signal=(A+C)-(B+D) Trace error signal=E-F.

2. Working principle

(1) Laser tube: wave length of loader DVD laser diode is 650nm, wave length of CD laser diode is

790nm, the wave length which is within 370nm and 750nm is visible light, the laser in the course of

reading DVD disc is visible light, and that when reading CD disc is infrared light.

(2) Principle about laser head picks up signal: laser beam projects onto disc, when laser beam

focus projects onto disc vertically, laser beam will produce reflection, reach on light sensor through

reflection loop and converse into electronic signal through photoelectric cell. For the reflection loop

produced in non pit information area and pit information area in disc has difference and reflects into

different position of light sensor, photoelectric diode in different positions on light sensor will produce

different signals to process all signals on light sensor and then produce digital signals.

(3) Focus, trace coil: when laser head is reading signals normally, information side should be in the

focus of laser beam, because of factors of disc error, high speed rotation and machine error, it is

unavoidable that laser beam focus deviates from information face to produce phenomena of orbit boas

and refocusing. Focus , trace coil is added on loader to adjust laser beam to make it correctly focus in

information area.

(4) Formation of RF signal: when disc reading is normal, light sensor will have 160MV, vague and

eye pattern waveform which is added on A, B, C, D respectively, and output RF signal from FRO pin after

being overlapped by adder inside light sensor, the frequency when reading DVD disc is much higher

than that when reading CD disc, output amplitude is about 1.4V.

3.2.2 Servo circuit

1. Servo system of this player adopts SANYO loader + MTK decode solution

(MT1389HD+FLASH(16M) + SDRAM (64M)), and its servo circuit is mainly composed of front end signal

Processing, digital Servo processing, digital signal processing IC MT1389HD and drive circuit D5954, in

which MT1389HD is also the main composed part of decode circuit. Servo circuit block diagram is

shown as in the following figure

3.2.2.1:

- 80 -

Cn101

Switch circuit

APC circuit

A B C D E F RFO

IOA

MD11
LDO2
LDO2

23

26

17

18

FOSO

1

FMSO

TRSO

DMSO

6

SL+

SL-

Feed electric
machine

Disc in/out
circuit

MT1389

Main axis electric machine

Main axis control
detect circuit

TK-

15

TK+

16

FC+

14

FC-

13

SP-

12

SP+

Figure 3.2.2.1 Servo circuit block diagram

D5954

11

2. Working principle

After power on, machine displays “OPEN”. After loading disc, loader pick-up begins to reset. After

pick-up goes to the proper position, detect switch will give a signal to MT1389, MT1389 begins to output

focus, main axis and laser signals, disc begins rotating and pick-up begins to identify disc information

and judge whether disk is CD disc or DVD disc according to disc information in order to output level from

pin IOA and control disc switch circuit and pick-up PD IC to make the corresponding action, meanwhile

Mt1389 adjusts laser output power through laser power control circuit.

After loader reads disc information, A, B, C, D, E and F signal are formed through photoelectric

conversion to MT1389 (DVD only has A, B, C, D signals) and RF signal and output from pin 2~11, 18, 19

of MT1389 respectively, after amplifying processing of pre-amplifier inside MT1389, now signals are

divided into 2 ways inside MT1389: one part, through summation amplifying and subtraction circuit inside

MT1389, produces servo error signal, after digital servo signal circuit processing, forms corresponding

servo control signals, outputs FOO, TRO, DMO and FMSO servo control signal from pin 42, 41, 37 and

38 of MT1389 respectively and then send to servo drive circuit for drive amplifying through the

integration circuit composed by resistor and capacitor and bring along focus coil, trace coil, main axis

Electric machine and feed electric machine after drive amplifying. Among these, focus and trace servo are

used to correct objective position accurately; feed servo is used to bring along laser head to make radial

large-scale move which belongs to the preliminary adjustment to laser head position; and main axis servo

is used to control main axis electric machine to make it read signals in means of constant Linear velocity

and bring along disc to rotate. After processing of amplification by VGA voltage control amplifier and

Equalization frequency compensation inside MT1389, another part of signals are changed Into digital

signals through internal A/D converter. When loader is reading CD/VCD signals, these signals are

- 81 -

Conducted EFM demodulation inside MT1389, and then outputted to latter stage for AV decoding after

finishing CIRC (Cross-Interleaved Reed-Solomon Code) error correction inside. When loader is reading

DVD signals, these signals are conducted ESM demodulation inside MT1389, and then sent to latter

stage for decoding after finishing RSPC error correction inside. General DVD players have a disc in/out

circuit to control disc tray door in/out acts to reach the purpose of making disc in and out. For PDVD, we

adopt manual disc in/out means and we can judge whether disc in to proper position through detect

switch.

3. Explanation to servo terms

(1) FOO: for disc make differences, and when rotating disc may probably move upwards or

downwards slightly to make the focus of laser emitted by laser head cannot justly fall on data pit of disc,

now focus point of objective lens is required to adjust to make focus aim at data pit exactly. The acts are

mainly to make objective lens move upwards and downwards.

(2) TRO: data information is saved in disc in form of tracks. When disc is rotating, disc deviation will

produce, now laser head is required to adjust. In this process, objective lens makes forward and

backward movement with small moving range.

(3) FMO: similar to acts of trace, the acts of feed are larger than those of trace. Feed conducts a

large scale movement firstly, and then trace moves slightly in this range. Feed moves for a while, and

does not move for another while; but trace moves all the time. Feed is rough adjustment and trace is fine.

And acts are obvious when power on and selecting track.

(4) DMO: it is the top that holds up disc. Its rotation speed decides that of disc. Its rotation is

generated by an individual DC electric machine, in which rotation speed of DVD is twice over that of CD.

3.2.3 Laser power control circuit

1. Laser power control circuit is shown as in the following figure 3.2.3.1:

LDO-AV33

R189

4.7R

Ce126

47uF/16V

LDO2

Q110

2

Cn101

5

MD1

6

2SB1132-S

20/21

MT1389HD

Q111

2SB1132-S

R190

4.7R

Figure 3.2.3.1 Laser power control circuit diagram

LDO-AV33

- 82 -

LDO1

Ce127

47uF/16V

2. Working principle

Location number Read DVD disc Read VCD disc Location number Read DVD disc Read VCD disc

Q110_E 2.9V 3.2V Q111_B 3.2V 2.2V

Q110_B 2.2V 3.2V Q111_E 3.2V 2.9V

Q110_C 2.2V 0 MT1389_20 0.2V 0.2V

Q111_C 0 2.2V

Pin 20/21 of MT1389 is laser power detect signal input pin, pin 21 is DVD laser power strong/weak

detect signal input pin, pin 23 is VCD laser power drive control output pin, pin 22 is DVD laser power

drive control output pin.

When reading VCD disc, laser power becomes weak, voltage of MDII pin decreases, voltage

decrease of pin 23 of MT1389 makes voltage of pin 6 of Cn101 increase to reach the purpose of raising

laser power. When laser power is too strong, voltage of MDII pin increases to lead to voltage of pin 23 of

MT1389 increase to make voltage of pin 6 of CN101 decrease to reach the purpose of reducing laser

power to form an auto power control circuit.

When reading DVD disc, pin 21 is detect signal input pin, pin 22 is drive control input pin, and the

working principle is the same with that when playing VCD disc.

3. Key point voltage (unit: V) is shown as the following table:

3.2.4 CD/DVD conversion circuit

1. CD/DVD conversion circuit is shown as in the following figure 3.2.4.1:

Figure 3.2.4.1 CD/DVD conversion circuit diagram

- 83 -

2. Working principle

Base

electrode B

Collector C Emitter E

Grid

electrode G

Drain

electrode D

Source

electrode S

G D S IOA

DVD disc 0 3.86 0 3.81 0.18 0 0 0 0 0

VCD disc 0.64 0.1 0 0 0 0 3.27 0.18 0 3.3

State

Q107 Q108 Q109

After loading disc in the player, IOA port of MT1389 is defaulted high level to make Q107 saturation

on and form loop together with CD laser power control circuit on CD. At the same time, IOA also goes to

loader PD IC to switch, disc begins to rotate, when servo management system recognizes that the disc

in player is not CD disc, IQA pin outputs low level to make Q107 cut off and make Q108 on, and form

loop together with DVD laser power control circuit on loader to perform disc reading acts. After disc tray

door opens, IOA keeps the state before opening disc tray door. If the player cannot recognize which disc

it is, IQA pin will switch continuously until reading disc or system judges that there is no disc.

Note: Q108 and Q109 are MOS tube

3. Key point voltage (unit: V) is shown as the following table:

3.2.5 Disc slot-in circuit

LD1506S adopts dual slot-in and sealed-style all-steel with compact structure. There is a all-steel

disc pressing system, in which disc is tightly pressed through 3 small steel plates, thus it is applicable

tothose discs with problem. It is really full-compatible with reading 12cm large disk and also 8cm small

disk. The player adopts light induction style to read disk. As long as you place the disc on the door, the

loader will absorb it in automatically.

1. Disc slot-in circuit is shown in the figure 3.2.5.1:

Vcc

GND

DISC

Q2

DESCEJT

Q1

PICK_UP

TROUT

Vcc

- 84 -

GND

Figure 3.2.5.1 Disc slot-in circuit diagram

2. Working principle: there are two light emission fluorescent tubes on top of the opening of slot-in

loader disk and there are two photoelectric tubes at bottom on two ends of disc opening. After loading a

disk, the disk holds up the light emitted from light emission tube to make the corresponding photoelectric

Diode (Q2) of this light emission tube cannot receive lights. Detect signal DISCEJT on loader outputs

high level to decode board. When DISCEJT pin of Mt1389 detects that DISCEJT signal is high level,

output disc tray in control signal. After disc tray enters to proper position, mechanical structure of loader

touches disc tray in switch, TRIN becomes high level from low level, decode chip stops outputting disc

tray in signals and machine begins to read disc. When disc tray is out, transmission structure conveys

disc outwards. When disc passes through the detecting of the photoelectric tube (Q1) inside loader,after

disc is out to the appointed position, TROUT becomes low level and disc tray out stops.

Note: in order to understand more simply, this schematic diagram has some difference from real

circuit, so please note.

3.2.6 Disc in/out circuit

1. Disc in/out circuit is shown as the following figure 3.2.6.1:

CE168

47uF/16V

LOAD-

TROPEN

R198
220R

R465
100R

+5V

R195
Q127
8550D

Q129

8050D

R197

2.2R\1/4W

Figure 3.2.6.1 Disc in/out circuit diagram

Q128
8550D

Q130
8050D

220R

Q180
9014-S

R469
470R

CE169
47uF/16V

TRCLOSE

TROPEN

R196
10K

LOAD+

MT1389

2. Working principle: INDISC, OUTDISI are disc in/out control signals and are connected to pin 39,

54 of U201 (MT1389) respectively. LOAD+, LOAD- connect with two ends of electric machine to control.

When users are performing disc out operation, servo control chip U201 (MT1389) sends out control

signal through pin 39, 54 and changes level of LOAD+, LOAD- to change the rotation direction of electric

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Machine to realize disc in/out function. The working process of disc in/out circuit is shown as follows:

Base electrode B Collector C Emittor E Base electrode B Collector C Emittor E

Read disc 5.06 5 5.06 5.01 5.03 5.06

Open disc tray to

proper position

4.79 4.77 5.06 4.77 4.79 5.06

Open disc tray

4.74 5.05 4.74 4.76 0.2 4.76

5.06

4.76 4.33 4.76 4.76 5.02 4.76

5.06

Close disc tray

4.74 4.33 4.74 4.76 5.05 4.76

5.06

4.76 5.03 4.76 4.79 0.2 4.79

5.06

Base electrode B Collector C Emittor E Base electrode B Collector C Emittor E

Read disc 0 5 0 0 5.03 0

Open disc tray to

proper position

0 4.77 0 0 4.79 0

Open disc tray

0 0.93 0 4.76 0.2 4.76

0 0

4.79 5.02 4.79

0

Close disc tray 0

4.76 5.05 4.76

0

0 0.93 0 4.79 0.2 4.79

0

Base electrode B Collector C Emittor E

Read disc 0 0 0 0 0

OUT IN

State

State

State

Q130

Q128Q127

Q129

Q180

OUT disc : VCC-Q127CE electrode on-LOAD+ -Electric machine-LOAD-

-Q130CE electrode on-R197-Ground.

When not opening disc tray, pin 39 and 54 of U201 (MT1389) are low level. When opening disc tray,

pin39 of U201 (MT1389) sends a high level; Q130 is on; Q130 collector electrode changes into low

level; LOAD- changes into low level; Q127 base electrode changes into low level; Q127 is on. Q127

collector electrode changes into high level and LOAD+ changes into high level.

IN disc: VCC-Q128CE electrode on-LOAD- -Electric machine-LOAD+ -Q129CE electrode on-R197-

Ground

When closing disc tray, pin 54 of U201 (MT1389) sends a high level; Q129 is on; collector electrode

changes into low level; LOAD+ is low level; base electrode through R230 and Q128 is low level; Q128 is

on; Q128 collector electrode changes into high level; LOAD- changes into high level.

The function of Q180 is interlock IN DISC and OUT DISC signal to ensure the two are not high level

at the same time. When the two are high level input, base electrode of Q130 is made to low level through

Q180 on to ensure the normal working of disc in/out circuit. The function of electrolytic capacitor CE168

and TC307 is to avoid the sudden change of the voltage on two ends of disc in/out electric machine to

make disc in/out acts smooth.

3. Key point voltage (unit: V) is shown as the following table:

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3.2.7 Main axis control circuit

Open disc tray to

proper position

0 0 0 0 0

Open disc tray

0 0.63 0

0 0

0 3.12 0

0

Close disc tray 0

0 0.93 0

0 0

0 3.12 0

1. Main axis control circuit is shown as in the following figure 3.2.7.1:

Figure 3.2.7.1 Main axis control circuit diagram

2. Function: disc is always in high speed rotation in the course of disc reading, when you need to

open the door to change disc, MT1389 stops the positive direction drive signal which is given to main

axis drive circuit, for the function of inertia disc is still rotating. If disc out order is performed at this time,

disc will be abrasively damaged. Therefore, machine must be baking to main axis, that whether disc has

stopped rotating and whether disc is reversing, decode chip of the machine cannot recognize. So a main

axis control circuit is added to make decode chip can effective monitor that whether disc has stopped

rotating.

OP+ is the in-phase input end of operational amplifier, OP- is reverse input end, OPO is output end,

when playing disc normally, for electric machine is positive direction rotating, voltage of OP+ is higher

than that of OP-, voltage of OPO is more than 1.4V. When disc out is needed, main axis drive signal

stops, for electric machine is permanent magnetic, when in rotating, induced electromotive force

produces in two ends to give to decode chip through R204, R205 sampling to make OPO output less

than 1.4V voltage and transmit to input pin of MT1389 ADIN through R207. When ADIN is high level,

main axis drive output end has not any drive signal output, when ADIN is low level, MT1389 outputs a

reversing drive signal to main axis drive circuit to make main axis electric machine speed down. Thus

circular working goes on until main axis stops rotating. PDVD is manual disc out means, so after disc out,

disc is still rotating, but will stop very son.

3. Working principle: MT1389 has a comparator inside composed of operational amplifier, in which

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4. Key point voltage (unit: V) is shown as the following table:

Key point Position Normal working voltage (V) Volateg change when disc out (V)

SP+ Pin 11 of D5954, pin 6of cn107 3.79

3.79 0.70 1.80

SP- Pin 12 of D5954, pin 5 of cn107 1.38

1.38 3.40 1.80

OP+ Pin 36 of MT1389 1.38

1.38 3.10 1.80

OP- Pin 35 of MT1389 1.53

1.53 3.08 1.98

OPO Pin 34 of MT1389 2.44

2.44 0.40 2.50

ADIN Pin 50 of MT1389 2.44

2.41 0.41 2.44

DMSO Pin 5 of D5954 1.42 1.42

VIP4 Pin 30 of MT1389 1.41 1.41

3.2.8 Decode circuit

1. Decode circuit block diagram is shown as in the following figure 3.2.8.1:

FLASH

PWR

PRD

PCE

A0~A20

AD0~AD7

URST

Reset
circuit

MT 1389

SDA
SCL

EEPROM

24C02

Figure 3.2.8.1 Decode circuit block diagram

Clock

27M

V18

1.8V
voltage
regulating

U1

SDCLK

SDCKE

DCS

DRAS

SWE

SDRAM

DQM0

DQM1

DQ0~DQ15

MA0~MA11

2. Working principle: this decode circuit is mainly composed of MT1389, SDRAM and FLASH.

Working condition of decode circuit has:

(1) Reset: refer to reset circuit working principle for details.

(2) Clock: this system adopts 27M external clock input, and produces clock signal required by

system inside through internal frequency doubling circuit.

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(3) Power: decode chip adopts twp groups power supply of 3.3V and 1.8V, in which 1.8V mainly

supply power for internal logic control circuit and we call it core voltage.

After power on, reset circuit performs reset to MT1389 built-in CPU (8032) and FLASH, decode chip

outputs reset signal at the same time and performs reset to other circuit. After system reset, it firstly

sends out read signal to FLASH to read out in formation saved in FLASH, the machine displays power-

on picture, servo system begins to work to check whether machine closes door to proper position and

whether detect switch has been closed, if not, the door close action is performed. After detect switch of

door is closed, the machine begins to perform preparations of disc reading and performs panel display

at the same time of working.

Playback process: laser head picks up disc signal from disc, after servo system processing, then

send to decode circuit for decoding, signal after being decoded is saved in SDRAM for the moment.

When machine needs to replay signal, decode circuit calls information inside SDRAM to perform D/A

conversion and then output.

User information storage: information content set by user is saved inside EEPROM, if user does not

refresh or reset this information, it will saved in IC permanently.

Audio, video output circuit: at present, MT1389 all integrates video D/A converter, MT1389HD

inside integrates audio D/A converter, manufactures select according to their own needs. Please refer

to circuit principle diagram and audio circuit explanation for details

3.2.9 Reset circuit

1. Reset circuit is shown as in the following figure 3.2.9.1:

.

Figure 3.2.9.1 Reset circuit diagram

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2. Working principle: after power on, voltage of +5VEXT increases to 5V, main chip power supply is

normal. Now, voltage of CE101 to +5VEXT cannot change suddenly to make base electrode of Q103

Has current flow in, Q103 is saturation on, URST is low level. +5VEXT charges CE101 in two paths

through Emitter junction of R262 and Q103 make negative pole voltage of CE101 decrease slowly.

When this voltage decreases below 0.7V, Q103 cuts off, URST changes into high level, the process for

URST from low to high is called effective reset signal of low level by us. After power off, voltage of

+5VEXT decreases, CE101 decreases together with +5VEXT voltage, D100 performs suge discharge

and clamping to CE101.

3. Key point voltage (unit: V)

Q103_B is low level when in normal condition, at the moment of power on, it decreased to 0V from

5Vgradually.

Q103_C is high level when in normal condition, at the moment of power on, it increases to 5V from

0V.

3.2.10 Video circuit

1. Video signal flow chart diagram is shown as in the following figure 3.2.10.1 :

YUV6

182

YUV5

183

YUV4

185

MT1389

187

L196

L195

L198

L197

DPR

DPB

DY

Figure 3.2.10.1 Video signal flow chart

10

U106

6

FSAV433

2

DVCVBSIN+

DVCVBSIN-

2. Working principle: MT1389HD has built-in video D/A conversion circuit, video output has Y/Pb/Pr

Y/Cb/Cr CVBS Y/C output mode, This player adopts component video/composite video mode to output

PRIN

PBIN

Y

7

9

MST718

11

to video main board of TV part MST718 and other video output mode is not used.

Shown as in the figure 3.2.10.2, capacitor C372, C208 and inductor L197 compose a low-pass filter

to filter high frequency disturbance signal except useful signal; C210 is a DC capacitor, R395 is load

resistor.

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Figure 3.2.10.2 Video output circuit

3.2.11 Audio circuit

1. Audio signal process block diagram is shown in the figure 3.2.11.1:

186

184

89AL

89AR

2

U117

6

DLIN

DRIN

MT1389

SAPDIF

Figure 3.2.11.1 Audio signal flow chart block diagram

Optical
terminal

07

AI3L

AI3R

STV
8216

SOUTL

SOUTR

TDA
7266P

SCART

2. Working principle: MT1389HD has built-in audio DAC conversion circuit, analog audio signals

output from decode chip directly, through audio amplifying and filtering circuit, directly output audio

signals to Cd4052 and then output after sound source switch through audio switch circuit to send to

stv8216 for the second selection and then output to audio amplifying circuit for amplifying and output.

3.2.12 USB/CARD circuit

1. USB/CARD circuit is shown as in the following figure 3.2.12.1:

J903-B(SD)

Mulit Purpost
Card-Reader

J903-A(MS)

Mulit Purpost
Card-Reader

J902

USB JACK

J901

USB JACK

SDCD

SDCLK
SDCMD
SDD0-SDD3

MSD0-MSD3
MSBS

MSINS

MSCLK

USBP2

USBM2

USBP1

USBM1

Figure 3.2.12.1 usb/card circuit diagram

U901

ADG713

Add usb switch

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USB_SWITCH

USBM

USBP

DVD decode
chip

Mt1389

214

48

47

2. Working principle: J903 is a 3-in-1 card holder which can read SD/MS card. When machine

switches in card read state, after inserting a SD card into card holder, detect switch on card holder

closes, SDCD signal becomes low level, MT1389HD begins to read SD content and then send to Mt1389

through data line SDD0-SDD3 for decoding to revert AV signals. MS card working principle is the same

with that of SD card. J901/J902 is an USB port, ADG713 is an USB port switch. When machine is set in

USB1, USB_SWITCH outputs high level signal. When machine is set in USB2, USB_SWITCH outputs a

low level signal to control working state of U901 directly.

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Section Three Servicing Cases

3.3.1 Servicing cases

[ Example 1 ] Symptom: DVD has no sound output

Description: disc read is normal, image output is normal, DVD playing has no sound output and

other external inputs are normal.

Analysis and troubleshooting: according to trouble symptom, trouble may lie in DVD board and audio

jack part. Firstly check whether pin 18/19 of video main board CN112 has audio waveform and then can

judge trouble lies in DVD board. Check pin 18/19 of DVD board XS103 and find that there is no audio

signal waveform.

Test TC240/TC241audio waveform and it is normal, so we judge trouble lies in U209 and peripheral

elements. Firstly check power supply of U209 and find that +12V has no power supply. Test pin 2 Xs101

according to line and there is still no +12V power supply. Check pin 5 of subsidiary power amplifying

board J3 and find that +12V power is normal, so we doubt flat cable from power amplifying board to main

video board has trouble. Change flat cable and trouble is removed.

[ Example 2 ] Symptom: disc tray ejects out automatically

Description: after power on, load disc and disc tray ejects out automatically.

Analysis and troubleshooting: connect with video terminal, power on and load disc. After disc tray

ejects in, TV screen displays “Loading” and then “Eject” after about 9 seconds. Disc ejects out, use

DVD, CD, VCD disc to test and this phenomenon still exists, so we doubt pick-up has trouble because of

aging and cannot read disc. After changing loader, trouble is removed. (If slot-in loader cannot read disc,

disc will eject out automatically)

[ Example 3 ] Symptom: do not read USB

Description: after machine switches in USB state, it dies not read USB but other functions are

normal.

Analysis and troubleshooting: Use multimeter to test USB terminal and find grounding and

+5Vvoltage are both normal. Use multimeter to test line from USB card board to DVD board and it is

normal, so we doubt 1389HD has trouble. Change 1389HD and trouble is removed.

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