Polaroid V23D series, V27D, series, V30D series Service Manual

Date: April 15, 2005
Ver. : 1.1

V23D/V27D/V30D series

LCD-TV(NTSC)

Service Manual

Table of contents

1. Precautions & Notice.......................................………………….3

2. Features & Specifications............................................………….5

3. Connection & Applications.........................................................10

4. Controls Location ........................................................................12

5. Remote Control. ..........................................................................13

6. Disassembly Instructions.............................................................15

7. Block Diagram..............................................................................20

8. Troubleshooting .................................................................……..21

9. Electronic Circuit Description................................................…27

10. Circuit Diagram....................................................…………….31

11. PCB Layout....................................................…………………56

12. Electrical Part List.................................................................... 65

13. Mechanical Disassembly............................................................67

1. Precautions & Notice

1.1 Safety Precautions

1) Cleaning: Unplug the power cord from the AC outlet before cleaning the
product. Use a damp cloth to clean the product. Do not use liquid cleaners

or aerosol cleaners.

2) Heat sources: Keep the product away from heat sources such as radiators, heaters, stoves and
other heat-generating products (including amplifiers).

3) For added protection for this television equipment during a lightning storm,

or when it is left unattended and unused for long periods of time, unplug it

from the wall outlet and disconnect the antenna. This will prevent damage
to the equipment due to lightning and power-line surges.

4) If an outside antenna is connected to the television equipment, be sure the antenna system is
grounded so as to provide some protection against voltage surges.

5) An outside antenna system should not be located in the vicinity of overhead
power lines or other electric light or power circuits, or where it can fall into
such power lines or circuits. When installing an outside antenna system, extreme care should be
taken to keep from touching such power lines or

Example of antenna grounding
As per national electrical code

Antenna lead in wire

Antenna discharge
unit

Grounding conductors
Ground clamps

Power service
grounding
Electrode system unit

Ground clamp

Electric service
equipment

3

circuits as contact with them might be fatal.

6) Ventilation-The vents and other openings in the cabinet are designed for ventilation. Do not
cover or block these vents and openings since insufficient ventilation can cause overheating
and/or shorten the life of the product. Do
not place the product on a bed, sofa, rug or other similar surface, since they
can block ventilation opening. This product is not designed for built-in installation; do not place
the product in an enclosed place such as a bookcase
or rack, unless proper ventilation is provided or the manufacturer's instructions are followed.

1.2 Product Safety Notice

1) Many electrical and mechanical parts in this chassis provide special visual

safety protection. The protection afforded by them cannot necessarily be
obtained by using replacement components rated for higher voltage, wattage, etc.

2) Before replacing any of these components, read the parts list manual carefully.

The use of substitute replacement parts, which do not have the same safety characteristics, as
specified in the parts list may create shock, fire or other hazards.

1.3 Service Notes

1) When replacing parts or circuit boards, wrap the wires around terminals before soldering.

2) Keep wires away from high temperature components.

3) Keep cable and their shielding in their original position so as to reduce interference.

4

2. Specifications

Specification

V23DXXX

ITEMS SPECIFICATION

Screen size 23” wide TFT-LCD panel
Aspect Ratio 15：9
Resolution

1280 x 768 (WXGA)

Contrast ratio 400:1(typ)

Brightness 450cd/m

2

(typ)

Viewing Angle Over 170∘(Hor.) / 170∘(Vert.)

Display

OSD Language Chinese , English, French , German , Spanish
TV standard (CCIR) NTSC
TV Turning system PLL 181 Ch.
STEREO MTS+SAP

TV I/P

CATV 125 CH.
Composite Signal CVBS
Y, C Signal S-Video

Video I/P

Composite Signal
Y, Pb Pr

HDTV system (720p, 1080i)
Signal I/P DVI-I Connector
PnP compatibility DDC / 2B

I/P Frequency

Analog：F

H

：31.5KHz to 60KHz

F

V

：56Hz to 75Hz

PC I/P

Recommended Analog：1024X768 (60Hz)

Audio 1：CVBS & S-Video

Audio 2：Y, Pb, Pr

Audio I/P Audio I/P：L/Rx3

Audio 3：PC

Video O/P Composite Signal TV only

Speaker (Build-in)：5W+5W (rms)@THD<10%

3.5mm miniature stereo phone jack

Audio O/P Audio O/P：L/Px3

Sound level output:：500 mV(rms)
PIP,VoV,3D De-interlace, 3D
comb-filter ,V-Chip, C.C. Settings

Yes

Other Functions

Aspect Ration Switching Normal → Periscope → Zoom →Full
Power Supply AC 110V ~ 240V, 50/60Hz

Power

Power Consumption ＜115W

Wight (net) 10.3Kg (Ref.) (Without Accessories)
Accessories Remote Control, Batteries, AC power cord

5

V27DXXX

ITEMS SPECIFICATION

Screen size 27＂wide TFT-LCD panel
Aspect Ratio 16：9
Resolution

1280 x 720(WXGA)
Contrast ratio 600:1 (typ)

Brightness 550cd/m

2

(Typ)

Viewing Angle Over 170∘(Hor.) / 170∘(Vert.)

Display

OSD Language Chinese, English, Fre nch, German, Spanish
TV standard (CCIR) NTSC
TV Turning system PLL 181 Ch.
STEREO MTS+SAP

TV I/P

CATV 125 CH.
Composite Signal CVBS
Y, C Signal S-Video

Video I/P

Composite Signal
Y, Pb Pr

HDTV system (720p, 1080i)

Signal I/P DVI-I Connector
PnP compatibility DDC / 2B

I/P Frequency

Analog：F

H

：31.5KHz to 60KHz

F

V

：56Hz to 75Hz

PC I/P

Recommended Analog：1024X768 (60Hz)

Audio 1：CVBS & S-Video

Audio 2：Y, Pb/Cb, Pr/Cr

Audio I/P Audio I/P：L/R x 3

Audio 3：PC

Video O/P Composite Signal TV only

Speaker (Build-in)：10W+10W (rms)

3.5mm miniature stereo phone jack

Audio O/P Audio O/P：L/P x 3

Sound level output:：500 mV(rms)
PIP,VOV,3D De-interlace, 3D
comb-filter ,V-Chip, C.C. Settings

Yes

Other Functions

Aspect Ration Switching Normal → Periscope → Zoom →Full
Power Supply AC 110V ~ 240V, 50/60Hz

Power

Power Consumption ＜140W

Wight (net) 14.5Kg (Ref.) (Without Accessories)
Accessories Remote Control, Batteries, AC power cord

6

V30DXXX

ITEMS SPECIFICATION

Screen size 29.6＂wide TFT-LCD panel
Aspect Ratio 15：9
Resolution

1280 x 768 (WXGA)
Contrast ratio 600:1(typ)

Brightness 550cd/m2 (Typ)
Viewing Angle Over 170∘(Hor.) / 170∘(Vert.)

Display

OSD Language Chinese , English, French , German , Spanish
TV standard (CCIR) NTSC
TV Turning system PLL 181 Ch.
STEREO MTS+SAP

TV I/P

CATV 125 CH.
Composite Signal CVBS
Y, C Signal S-Video

Video I/P

Composite Signal
Y, Pb, Pr

HDTV Ready (720p, 1080i)

Signal I/P DVI-I Connector
PnP compatibility DDC / 2B

I/P Frequency

Analog：F

H

：31.5KHz to 60KHz

F

V

：56Hz to 75Hz

PC I/P

Recommended Analog：1024X768 (60Hz)

Audio 1：CVBS & S-Video

Audio 2：Y, Pb/Cb, Pr/Cr

Audio I/P Audio I/P：L/Rx3

Audio 3：PC

Video O/P Composite Signal TV only

Speaker (Build-in)：10W+10W (rms)

3.5mm miniature stereo phone jack

Audio O/P Audio O/P：L/Px3

Sound level output: 500 mV(rms)
PIP,VoV,3D De-interlace, 3D
comb-filter ,V-Chip, C.C. Settings

Yes

Other Functions

Aspect Ration Switching Normal → Periscope → Zoom →Full
Power Supply AC 110V ~ 240V, 50/60Hz

Power

Power Consumption ＜150W

Wight (net) 15.2Kg (Ref.) (Without Accessories)
Accessories Remote Control, Batteries, AC cord, AC power cord

7

PC I/P

Mode

No.

Mode Name

Resolution

H.Freq.(KHZ)

V.Freq.(HZ)

H. Polarity

V. Polarity

Pixel

CLK

(MHZ)

1 VGA 70HZ

640*350

31.469

70.087

＋
－

25.175

2 VGA 60HZ

640*480

31.469

59.941

－
－

25.175

3 VGA 72HZ

640*480

37.861

72.81

－
－

31.5

4 VGA 75HZ

640*480

37.5

75.0

－
－

31.5

5 SVGA 60HZ

800*600

35.16

56.25

＋
＋

36.0

6 SVGA 60HZ

800*600

37.879

60.317

＋
＋

40.0

7 SVGA 72HZ

800*600

48.077

72.188

＋
＋

50.0

8 SVGA 75HZ

800*600

46.875

75.0

＋
＋

49.5

9 XGA 60HZ

1024*768

48.363

60.004

－
－

65.0

10 XGA 70HZ

1024*768

56.476

70.069

－
－

75.0

11 XGA 75HZ

1024*768

60.023

75.029

＋
＋

78.75

12 MAC VGA

640*480

35.0

66.667

－
－

30.24

13 MAC VGA

832*624

49.725

74.550

－
－

57.283

14 US TEXT

720*400

31.469

70.087

－
＋

28.322

15 WXGA

1280*768

47.73
60

－
－

80

16 WXGA

1280*720

45
60

＋
＋

74.25

8

PC I/P

Mode

No.

Mode Name

Resolution

H.Freq.(KHZ)

V.Freq.(HZ)

H. Polarity

V. Polarity

Pixel

CLK

(MHZ)

1 VGA 70HZ

640*350

31.469

70.087

＋
－

25.175

2 VGA 60HZ

640*480

31.469

59.941

－
－

25.175

3 VGA 72HZ

640*480

37.861

72.81

－
－

31.5

4 VGA 75HZ

640*480

37.5

75.0

－
－

31.5

5 SVGA 60HZ

800*600

35.16

56.25

＋
＋

36.0

6 SVGA 60HZ

800*600

37.879

60.317

＋
＋

40.0

7 SVGA 72HZ

800*600

48.077

72.188

＋
＋

50.0

8 SVGA 75HZ

800*600

46.875

75.0

＋
＋

49.5

9 XGA 60HZ

1024*768

48.363

60.004

－
－

65.0

10 XGA 70HZ

1024*768

56.476

70.069

－
－

75.0

11 XGA 75HZ

1024*768

60.023

75.029

＋
＋

78.75

12 MAC VGA

640*480

35.0

66.667

－
－

30.24

13 MAC VGA

832*624

49.725

74.550

－
－

57.283

14 US TEXT

720*400

31.469

70.087

－
＋

28.322

15 WXGA

1280*768

47.73
60

－
－

80

16 WXGA

1280*720

45
60

＋
＋

74.25

8

DVI I/P

Mode

No.

Mode Name

Resolution

H.Freq.(KHZ)

V.Freq.(HZ)

H. Polarity

V. Polarity

Pixel

CLK

(MHZ)

1

VGA 60HZ

640*480

31.469

59.941

－

－

25.175

DVI

2

SVGA 60HZ

800*600

37.879

60.317

＋

＋

40.0

DVI

3

XGA 60HZ

1024*768

48.363

60.004

－

－

65.0

DVI

4

US TEXT

720*400

31.47

70.08

＋

＋

28.320

DVI

9

3. Connection & Applications

(TV only)

10

Note:

z Audio out: The level of Audio O/P is constant. It won’t be affected by aligning volume, treble and bass.

This connecter should be connected to outer audio amplifier to enlarge the volume.

z Video O/P: When user wants to connect Audio and Vide o O/ P of o ur LC D-TV to VCR for recording

program, the O/P has only one choice that is TV mode.

z Audio O/P: IF the main display is TV, the Audio O/P must be TV sound; otherwise, if sub display is TV, the

Audio I/P must be selected to “Sub”, so that the Audio O/P will be TV sound.

Video Input device

˙DVD player
˙Satellite receiver
˙Set top box

˙VIDEO Inputdevice
˙Digital Camera
˙Satellite receive

˙Set top box

11

4. Control Location

These buttons control your TV’s basic features, include the on-screen mean. To use the more
advanced features, you must the remote control.

POWER: turn on or turn off the LCD TV.
SOURCE: set up the input source (PC,VIDEO,SV,TV,CV).
MENU: display the main menu.
CHANEL (down/up): change channels on sequence.
VOLUME(+/-): turn up or turn down the volume.
ASPECT RATIO: set up the display (Normal, Periscope, Zoom or Full).

Remote sensor window

Aim the remote control towards this region on the TV.

Speaker Speaker

12

5. Remote Control

The remote control pad works almost as same as ordinary TV remote control that includes the basic
function needed while viewing a live video:

Sleep
Power

Number Buttons

Return
Channel UP

Mute
MENU/Enter
VOL+

TITLE / EXIT
Channel DOWN

APC

Audio Function

TV

PC
AV
SV

CV

SWAP

VOL－

Reset

ARC

Subwoofer

Other Function

PIP Function

13

Summary of Control Button

PPoowweerr ccoonnttrrooll

Press POWER button Direct to turn on or turn off the display

Selecting the signal source

Press TV button Direct to switch to the TV mode.
Press AV button Direct to switch to the AV Video mode.
Press SV button Direct to S-Video mode.
Press CV button Direct to switch to the Component mode (Y Pb Pr).
Press PC button Direct to switch to the PC mode.

Menu Setting

Press MENU/ENTER button Display the main on-screen menu or enter the next menu.
Press TITLE/EXIT button Display the current channel digits/Exit from the menu.

Changing Channels

Press UP button Press Up to change channel on the TV.
Press DOWN button Press Down to change channel on the TV.
Press 0~9，+100 button To select channels directly on the TV.
Press RETURN button Return to the previous channel on the TV.

Sound Control

Press VOL+ button Press to turn up the volume.
Press VOL- button Press to turn down the volume.
Press MUTE button Press to temporarily cut off the sound.
Press MTS button Press to choose stereo, mono or separate audio program supply the

multi-channel sound services.
Press AUDIO button Select present audio is main display or sub display.
Press TREBLE button Adjust the treble of audio.
Press BASS button
Press SUBWOOFER button.

Adjust the bass of audio.

Open the subwoofer function.

PIP Control

Press ON/OFF button Press to watch one of video sources on sub display. Press again to make the

sub display disappear.
Press TV、AV、SV、CV button Press to select one of the PIP window input source.
Press SIZE button To make the PIP window double, large or small.
Press POSITION button Press to move the PIP window to：Top Left→Top Rig ht→Bottom Right→

Bottom Left→Repeat

Other Function

Press SWAP button Change main display and sub display.
Press RESET button Return to the original factory settings.
Press ARC button In PC source：Set the picture window to full or normal.

In Video source：Set the picture window to normal→full→periscope→zoom.
Press APC button Select Normal, Clear, Dark, and Theater mode for picture control.
Press SLEEP button Press to select a present time interval for shut off.
Press V-CHIP button Set Parent Control function.
Press C.C button Set the caption of TV programs show on or off.
Press ADD button Add the channel of TV programs in TV source.
Press ERASE button Erase the channel of TV programs in TV source.

14

6. Disassembly Instructions

A. Face down the LCD-TV :

Face down the LCD-TV on a smooth plane with a soft material to protect the panel faceplate.

B.Base Neck Removal Procedure :

1. Remove 2 screws from Neck Cover. (Indicated as “ A “)

Then you could take the Back Cover of neck apart from the LCD-TV

C. Base Removal Procedure:

1. Remove 4 screws from the Back Cover. (Indicated as “ B ” and “ C ”)
Then you could take Base (assembly) apart from the LCD-TV.

A

B

C

15

D. Tuner Cover & AV Cover Removal Procedure:

1. Remove Tuner Cover. (Indicated as “D”)

2. Remove AV Cover before, you should be loose the screw (Indicated as “E”)

E. Back Cover Removal Procedure:

1. Remove 8 screws from the Back Cover. ( Indicated as “ F “and “ G “ )

2. Remove a screw from the Tuner Board. (Indicated as “ I ”)

3. Take slide of tuner board.

Then you could take Back Cover apart from the LCD-TV.

F

G

G

F

E

D

I

16

F. Right/Left Side Covers and Tuner Board Removal Procedure:

6.1 Remove 4 screws from Slide of AV PCB & left side Covers. (Indicated as “ H ”)

6.2 Remove a screw from the Tuner Board. (Indicated as “ I ”)

6.3 Remove 3 screws from the power case assembly. (Indicated as “ J ”)

Then you could take Slide of AV PCB, Power case, and Left Side Covers Removal.

G. Main PCB Shield Removal :

1. Remove 2 screws from Main PCB Shield. (Indicated as “ K”)
Then you could take Main PCB Shield apart from Main Bracket and the PCB Board will
be shown on it .

K

H

H

J

17

H. Main PCB Removal procedure:

1. Remove 9 screws from the Main PCB. (indicated “ L “)

Then you could take Main PCB apart from the LCD-TV .

I. Panel Bracket Removal procedure:

1. Remove 4 screws from the Panel Bracket. (Indicated as “ M ”)

Then you could take Panel Bracket apart from the Front Cover.

L

M

18

19

UT01

I044

I010

I033

I024

I035

I018

I006

I031

I001

I038

I037

I032

I019

I020

I009

I013

I012

I035

I040

7. Block Diagram

Video Decoder

SAA7117

De-Interlace

SiI504C

ADC

Scaler

TP6761

LCD

Panel

23”/27”/30”

ADC

AD9883A

Video Decoder

SAA7117

Micro Controller

TP2808)

Key Pad

INVERTER

E2PROM

IR Pad

Remote Control

8 bi

t

CV

SV

Interlaced

Pro

g

ressive

24 bit

AV

3D Comb filter

TC90A65F

(or UPD64083)

V-Chip

Z8612912

Port V(Sub)

Port B(Main)

Port A(Main)

PI5V330

10W + 10W
Speaker

Headphone
Subwoofer

TV – Tuner

(Philips)

FQ1236 MK3

4:1

MTS & Audio Processor

MSP3440G

Audio Amp.

TFA9843)

CV Audio

SV/A V Audio

PC Audio

ANT

Audio

P15V330

TV/AV

Interlaced

Sync.

VGA

I

2

C

SIF

Video

PC

RAM

HY57V64

RAM

HY57V16

Interface

THC63

LVDM83A

Silicon Image

Sil169

DVI

20

8. Troubleshooting

8.1 Symptom Codes :

CODE SYMPTOM COUNTERMEASURES
NP1

No Picture and No Sound
in TV mode.

z Make sure the Power cord and Antenna cable are

properly connected .

z Make sure the batteries in remote control are not

flat.

z Switch to TV source by pressing TV button.
z Select the correct signal source: “ANT” or “STD/

HRC/ IRC ” in OSD menu.

z Run “Auto Scan ” in OSD menu.

NP2

No Picture and No Sound
in video mode.

z Check the connection between the optional video

equipment and the TV.

z Press AV, SV, or CV button on the remote control to

select the corresponding video source.

NP3

TV is automatically turned
off.

z Check if the “SLEEP” timer is activated .
z Press POWER button to turn on the TV once again.

NP4

Screen appears “totally
snowy” in TV mode. After

10 min., it turns off
automatically.

z Check if Aerial cable is correctly connected.
z Press POWER button to turn on the TV again.
z Press CH Up/Down buttons to change channels.

No picture and and no Sound

NP5

Screen appears “No
Signal” in video mode.

After 10 min., it turns off
automatically.

z Check if Video Cable is correctly connected and

Video Device is normal.

z Press POWER button to turn on the TV again.
z Press AV, SV, or CV button on the remote control to

select the corresponding video source.

PP1

Double Images / Ghosts If the TV suffers interference from signals reflecting from

mountains or buildings , double-pictures or Ghosts will
occur.

z Adjust the Antenna’s location and direction
z Replace it with one with better directionality .
z Turn off or disconnect the booster if it is in use , as

the booster may be inappropriate.

PP2

Snowy picture and noisy
Sound

If snow totally blocks out the picture , there may be a
problem with the Antenna or Antenna Cable .
z Have the TV and Antenna been connected

properly ? Has the Antenna cable been damaged ?

z Is the Antenna pointing in the right direction ?
z Is the Antenna itself faulty ?
z Try using a booster , as signal transmission may be

low.

PP3

Distorted picture and
noisy sound

z Turn off or disconnected the booster if it is in use ,

as broadcast signals may be too strong.

Poor Picture

PP4

Dotted Lines / Stripes
in the picture.

If the TV or Antenna suffers interference from other
equipment , stripes or noise may appear in the picture.

z Keep the TV away from noise sources such as

personal computer , amplifier , cars, motorcycles or
hair-dryers.

z If the aerial suffers interference from a radio tower

or high-voltage wire , contact the local dealer.

21

CODE SYMPTOM COUNTERMEASURES
PP5

Stripe noise. z Check the coaxial cable connected with the TV is not

oxidized

z Do not use 300 ohm twin lead cables as interference

may occur

z It is recommended to use a 75 ohm coaxial cable

(not supplied) to get premium quality picture.

z Keep the aerial cable away from other connecting

cables.

PP6

No color, too light or too
dark

z Adjust the picture settings —

APC, Brightness,

Contrast, Saturation , Color Temp.

z Press RESET button on remote control to return all

settings to factory settings.

Poor Picture

PP7

Poor picture on particular
channel.

z Use “Fine Tune” in OSD to manually adjust a

particular channel for optimal reception.

NS1

Good picture, no sound z Mak e sure the headphone is not connected. (option)

z Check audio connections between Equipment &

LCD-TV.

z Press MUTE or VOL Up to cancel the muting.

No Sound or Noisy Sound

NS2 Noisy noise z Make sure that the antenna connected is 75 ohm

coaxial cable (not supplied) , not 300 ohm twin lead
cables .

z Keep the antenna cable away from other connecting

cables.

z Press MTS button to select “Mono” which will

reduce the noise.

z Adjust BASS or TREBLE properly on remote

control.

PC1 PC display is Not Full

Screen

z Select “Auto Image” in OSD menu to optimize the

image .

z If executing Auto Image Adjust still can not achieve

full screen display, adjust “V. Position” and “H.

Position” in PC mode

PC2 Horizontal Noise or Color

pattern is not uniform

z Select “Auto Image” in OSD menu to optimize the

image .

z If still no good , adjust “Phase” in OSD menu

PC3 “Out of Range” message z Maximum PC resolution supported is 1280x768

, so the screen will appear “Out of range” at higher
resolution.

z Reduce the resolution to1280x768 from the PC.

Note

20〞panel resolution is 640 x 480.

PC4 No Sound z Make sure PC audio Input is well connected.

PC

PC5 After “No Signal ” has

appeared on PC mode for
a while, the view
disappears and the LED
Indicator turns from
Green to”Amber” .

z Press any key on keyboard or move the mouse to

activate the PC , because the PC may go to power
saving status.

z Check if the D-sub or DVI connector (Cable) is

disconnected or loose.

22

CODE SYMPTOM COUNTERMEASURES
RC1 Remote Control does not

work

z Make sure the batteries in remote control are not flat
z Check the polarity of the batteries
z Use the remote control in the front of the TV or from

less than seven meters away.

z make sure the Remote Sensor Window is not under

strong lighting.

Remote Control

RC2 Can not change channels

with the remote control

z Press TV button to switch to TV mode.

PH1

Picture suddenly Stops
Responding or
abnormal.

z Press RESET button on remote control .
z Unplug and then plug the Power Cord of the TV from

the AC outlet.

Picture Halt / Abnorm al

NG1

Issues can’t be solved. z If the picture still abnormal, execute “ Clear

EEPROM”.

STEPS

:

1. Press POWER key to turn off the LCD-TV.

2. Press CH key▽ , then press Power key of remote

control to turn on the LCD-TV, after

3 seconds, then release CH▽ key.

3. When「INITIAL EEPROM」appears on the screen,

on the INTTAL EEPROM is complete.

Note : Remind user that every setting will return to

factory preset mode including PIN of parental
control (PIN :1234), channel setting.

Note

1. CV and PC including D-sub or DVI modes, are not available on Sub-display of PIP .

2. If main display is CV , PIP mode is not available.

23

8.2 Troubleshooting Flow Chart

3~5V

Is the Voltage at

I029#8= 5V？

No

No

Replace I029

Yes

No

No picture

No picture

Erase

EEPROM

Picture
appears

Replace I012(MCU)

Fix at
factory

No picture

Yes

Restart and check
sources are
connected

Re-plug white connector,
then measure voltage
again

Check if inverter is
connected correctly.

Yes

N

o

Panel wire (P005) is
connected correctly?

Re-

plug

No

否

否

Yes

Yes

Yes

Does the LED
light up？

Is LED display
Amber？

Restart signal to

ensure H. V.
sync are not

absent

End

Is it entering into

power saving on PC
mode?

No

Picture
appears

Picture
appears

Replace Main Board
PWB-0812

No

No

No

Yes

Re-

plug

No picture

No picture

No picture

No picture

Re-

plug

No

Yes Yes

Picture
appears

No

Yes

No picture

No picture

Picture
appear

No picture

Replace Inverter,
test again.

Measure white connectors
of 2 sides pin voltage that
are at 3V and 24V

White connector of
power Module (8p
or 12p) is connected
correctly?

Check if panel
light works?

Re-

plug

No picture Appear

Measure of

I029#4 =? volt

0~0.5V

Picture

appears

Picture

appears

Picture

appears

Picture

appears

Replace Power
Module, test
again.

Erase

EEPROM

Picture
appears

（1）Power Start NG

24

(2) Picture abnormal

No

Replace V901

(LCD panel)

Yes

No

End

Yes

Yes

Yes

No

Change Inverter

and check picture

No

No

No

Yes

Yes

Yes

No

Yes

Change main

board (PWB-0812),

and check picture.

Change Power

Module, and check

picture

No

After welding,

then check the
picture.

Are the panel
cables (P005)

attached

correctly?

Re-plug the

panel cable, and

check the

picture

Erase

EEPROM, and

then check the

picture is

否

Check side SMD of
I019&I020 is welded
correctly?

The Ver. Or Hor.

Sync. does not

hold

in any source

25

Steps to clean EEPROM

1. Press POWER key to turn off the LCD-TV.

2. Press CH key▽ , then press Power key of

remote control to turn on the LCD-TV, after
3 seconds, then release CH▽ key.

3. When「INITIAL EEPROM」appears on the

screen, on the INTTAL EEPROM is complete.

Trouble Shooting

1. MCU platform using Topro TP2808

2. Label：V30DMBT-U21

3. Check Sum：3E86H
BIOS Version：V30DMBT-U21 WBK-MP 1.1 12/21/04
EEPROM INITIAL：Power + Channel Down

4. Enter Factory Mode：Power + Menu Key

5. Leave Factory Mode：Power off

6. Self – Test Mode (for Burn in)：Push Menu + Channel Up + Power ON、Key at same time, and

then loose Power On Key first、Keep push Menu and Channel Up Keys for 2 seconds，test pattern
will appear on the screen(Self-Test Mode can’t be disable by disconnecting Power Supply, it must
thru. Power Key).

7. Disable Self-Test Mode：Push Power Off/On Key

WBK

V30D-U21

MP 1.1

´Custom
´Model NO.
´Edition

26

9. Electronic Circuit Description

9.1 Main Board Circuit

(1) DVI-I signal

Refer to circuit diagram of PWB-0812
The analog RGB video input signals are supplied through the DVI-I cable which is
terminated at P022. These three input signals are approximately 0.7Vpp in amplitude.
R374、R301 and R327 give resistance of 75Ω respectively for impedance matching. These
R、G、B video signals are ac coupled via 0.047U capacitor C021、C016 、C013 and then
fed into the I001 AD converter (MST9883C) at Pin54、49 and 43 respectively. These analog
R、G、B video signals are converted to the their digital forms in I001. The outputs of digital
data including 8 bits red、8 bits green、8b bits blue signals are assigned at Pin70 ~ 77、Pin
2 ~ 9 and Pin 12 ~ 19 of I001，and applied to Port A of I019 (Scaler：TP6761 ) Hsync &
Vsync are applied to I001 (MST9883C) #30 & #31 and the processed signal taken from #66
& #64 are fed into I019 (TP6761) #18、#19..
CLK signal is taken from I001 (MST9883C) #67 and applied to I019 (TP6761) #156.The
LCD-TV is designed to have the DDC/2B FUNCTIONS. Communication between the
LCD-TV and computer for DDC is via P022 (DVI-I connector ) #20、#21 which are defined
as SCL、SDA signals. The computer will read out the EDID from the I011 (EEPROM) and
the EDID data is written into the EEPROM in the factory during production.

The digital input signal through DVI-I cable which is terminated at P022. Input signal from

TMDS low voltage differential signal input data pairs Pin 80、81、85、86、90、91 and TMDS
signal input clock pairs 93、94 are fed into I040 (SiI 169).

The I040 (SiI 169) supports High-bandwidth Digital Content Protection (HDCP) by

decrypting the pixel data stream received from an HDCP transmitter in the video host
system. HDCP provides a secure method of delivering high-definition content between a
host (such as a set-top box, DVD player, or D-VHS player) and display (such as an HDTV,
projector, or A/V receiver).

The SiI 169 comes pre-programmed with a production set of HDCP keys in its internal

EEPROM. In this way the keys are provided the highest level of protection as required by
the HDCP specification.

27

UT01

I044

I010

I019

I033

I024

I035

I018

I006

I031

I001

I038

I03

I032

I020

I009

(2) AV Signal

Refer to the page 8 in circuit diagram of PWB-0812.
V30DXXX / V27DXXX can process 4 different Video signals，including Composite
Video (CVBS)、Separate Video (S-Video ) and Component Video (YUV). Component
Video also includes two types Y Cb/Cr and Y Pb/Pr, and I018,I031 SAA7117 is 16
channels analog input. There are 4 A/D in it’s I/O port, So it can match this model.
Examples for different of input source signals are listed one by one as follow. (please
refer to the circuit diagram)：

A. TV：

i. TV signals enter from ANT to Pin#1 of UT01 FQ1236 MK3 Tuner. Pin

#14 output Audio MPX signal, while Pin#12 output TV (CVBS) Video signal.

ii. Audio MPX signal does MTS demodulation from I044 (I044 MSP3440G).

It can output Audio signal including Mono、 Stereo、Sap and so on. Then
through I010 (Audio Power Amp) to Speaker.

iii. After the Video signal to the V-Chip circuit (I025 NJM2244、I033

Z86129、I030 74HC126) to modulate it, output to I031 SAA7117 Video
Decoder (Main) or I018 SAA7117 Video Decoder (Sub) circuit to do
modulation and Video source exchanges for CVBS signal type. Then CVBS
signal changes to the ITU-656 type by I031 or I018 and outputs to I019 Scaler
to process. 8 Bit belongs to Data parts, and H sync, V sync, CLK directly
connect to Pin#162、163、164 of Scaler. Then R、G、B signal respectively output
six bits to panel.

10W +
10W
Speaker

Headphone

TV – Tuner

(Philips)

FQ1236 MK3

4:1

MTS & Audio

Processor

MSP3440G

Audio Amp.

TFA9843)

CV Audio

SV/A V Audio

PC Audio

ANT

Audio

SIF

Video

Vide o Deco der
SAA7117

De-Interlace

SiI504C

ADC

AD9883A

Scaler

TP6761

LCD

ADC

AD9883A

Vide o Deco der
SAA7117

8 bit

CV

SV
AV

Interlaced

Progressive

24 bit

24 bit

3D Comb filter

TC90A65F

(

or UPD 64083

)

V

-Chip

Z8612912

Port
V(Sub)

Port
B(Main)

PI5V330

P15V3

TV/AV

Interlaced

Sync.

VGA

PC / Component Video

RAM HY57V64

RAM

HY57V16

Interface

THC63

28

B. CV (Y Pb Pr )：

Entering from P50 signal, then enters Pin#43、48、54 of AD9883 passed by the
matching impedance resister and capacitance. It converts to RGB signal of
YUV by I006 and passes to Port B of I019 by six row-resister RP08 ~ RP12.
Then output to panel.

C. Audio：

The rest of Audio source all connect Audio Processor ( I044：MSP3440 ) to
each left and right voice channels. Controlled by MCU (I012) and selected
through I044, just output one source to Audio Power Amp (I010： TFA9843) to
Speaker.

(3) MCU

Microcontroller
Refer to circuit diagrams Sheet 5 of 11.
The microcontroller I012 Topro TP2808 is running with the clock based on 14.318
MHz by X003.

C127 and R096 constitute a reset circuit. It properly the necessary active high reset
signal for I012 (Microcontroller) to operator properly. This reset signal is result that is
fed into I012 (Pin#10) to provide the necessary system reset for the proper operation
of I012.

The signal IR- DAT (Pin#15 of I012) is used for Infrared Receiver. If the IR Received
some signal，I012 will send interrupt signal by Pin #2、3 (MSDA、MSCL) to control
any chip.

The signal designated AD0 ~ AD7 (Pin36 ~ 43 of I012) are data signal used for
transferring data between I012 and I019.
The signal TXD and RXD ( Pin#13、11 of I012 ) are used for debugging during
firmware.
I013 (24LC16B) provides necessary non-volatile storage for system operating
variables and parameters. It is controlled by I012 via MSDA and MSCL signal, witch
pulled-up to +5V voltage with R092 and R093 (10KΩ).

(4) Panel interface

Refer to circuit diagrams Sheet 6 of PWB-0812
The signals of panel interface are all from I019 to the LCD Panel.
The signal FPVCC (Pin#96 of I019) and MMTB3904 (Q003) control the +5V power
to the LCD Panel.
The signals FPBACK and DVD0 (Pin#95、62 of I019 ) are used for the control of
backlight’s On / Off state and Panel luminance.
The signals SHFCLK、PDE、PVYSNC、PHSYC come from Pin#90 ~ 94 of I019, and
then fed into P005. These four signals are used for panel image display controls.

29

Pin#A1BLU0 ~ 7、A1GRN0 ~ 7、A1RED0 ~ 7 and B1BLU0 ~ 7、B1GRN0 ~ 7、
B1RED0 ~7 are data output from I019 to P005 and P802( to LCD Panel ). They are
buffered by LP02,LP04,LP06,LP08,LP10,LP12 and filtered associated capacitors.
These outputs are organized into even and odd connectors, each with 18 bits.

9.2 Keyboard Circuit & IR Lens board

The keyboard and IR lens circuit are shown in chapter 10-3 of the circuit
diagrams.

9.3 Inverter Circuit

The inverter board is fed with +24V through P802#1~#5 on Power module and offers

4.1ma (typical ) to each lamp of backlight in LCD panel.
The brightness adjusted in OSD menu is to control the voltage at P802#11 while this
voltage is offered by I019 (Scaler：TP6761)#62.
The range of the voltage is from 0V to 3.3V. If the voltage of P802#11 is 0V, the
screen will get light; if it’s 3.3V, the screen will get dim. It means that the dif ferent
voltage will change the lamp current through the inverter to make the screen lighter or
dimmer.

9.4 Power Module

The Power Module circuit shown in chapter 10-6. The Power Module provide +5V
+24V though P802 for whole system.

30

10. Circuit Diagram

PCB Main Board Circuit

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

11. PCB Layout

50

51

52

53

54

55

56

57

58

59

POWER Layout

60

61

62

63

64

12. Electrical Part List

Model

part number

V23DXXX V27DXXX V30DXXX

NOTE

TFT Panel

LG
LC230W01­5051253665
(include
Inverter)

CMO V270W1

1.5051253656
(include
Inverter)

CMO V296W1

1.5051253668
(include
Inverter)

Inverter

panel is
included

panel is
included

panel is
included

Power

Module

6693006615(RA)
6693006611(RB)

1.HOAU242001
150W

6693006610(RA)

2.PHIHONG
150W

6693006601(RB)

6693006610(RA)
6693006601(RB)

Tuner

Board

PWB-0707

U12-5097632521

PWB-0707

U05-5097632508
U12-5097632519
U21-5097632519

PWB-0707

U05-5097632509
U21-5097632523

I/O Board

PWB-0612

U12-5097624527

PWB-0612

U05-5097624513
U12-5097624523
U21-5097624523

PWB-0612

U05-5097624514
U21-5097624530

IR Board

PWB-0739-2

U12-5098800942

PWB-0739-2

U05-5098800801
U12-5098800908
U21-5098800908

PWB-0739-2

U05-5098800803
U21-5098800969

Key Board

PWB-0739-1

U12-5098800941

PWB-0739-1

U05-5098800800
U12-5098800907
U21-5098800907

PWB-0739-1

U05-5098800802
U21-5098800968

EE

PARTS

Main

Board

PWB-0812

U12-5097641403

PWB-0812

U05-5097641400
U12-5097641402
U21-5097641402

PWB-0812

U05-5097641401
U21-5097641405

65

Speaker

U12-5055123800 U05-5055126200

U12-5055126200

U05-5055125600
U21-5055123700

Remote

control

U05-5052731052
U12-5052731043
U21-5000100072

U05-5052731052
U21-5000100072

MCU

6647021817 6647021817 6647021817

Note:

Different
model have
different
firmware
version.

Signal

Cable

DVI-I cable

U05-5057424010
U21-5057424010

DVI-I cable

U05-5057424010
U21-5057424010

Power

Cord

U12-5056705900 U05-E056705900

U12-5056705900
U21-5056705900

U05-E056705900
U21-5056705900

User＇s

Manual

U12-5030007049 U05-5030057109

U12-5030057126

U05-5030057109
U21-5030057146

Front

Cover

U12-5641101101 U05-5641101601

U12-5641101003
U21-5641101002

U05-5641101401
U21-5642298207

Back

Cover

U12-5642294312 U05-5642292206

U12-5642292209
U21-5642292210

U05-5642292010
U21-5642292018

ME

PARTS

Base

U12-5641416405 U05-5640410000

U12-5641412707
U21-5641416305

U05-5640410000
U21-5641412707

66

13. Mechanical Disassembly

67