Tatung V32FLBB, V32FCBB, V32FMBB Schematic

32” LCD-TV

Service Manual

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Version 1.0

April 12,2005

Table of Contents

1. Safety and Precautions ……………………………………………1

2. Specifications.............................................…………………………3

3. Connection & Applications……….............................................….5

4. Controls Location …..................................................……….…….7

5. Remote Control.......................................................………………..8

6. Disassembly Instructions.....................……………….……….…..10

7. Block Diagram........................……………………………………..14

8. Troubleshooting…………...............................…………………….15

9. Factory Mode Setting ……………………………………………..20

10. Electronic Circuit Description...........…………………..…………21

11. Circuit Diagram.............................…………………………..…….24

12. PCB Layout.............................………………………………..……45

13. Electrical Spare Parts List …..........................……………………49

14. Mechanical Disassembly ...…......................……….…………….51

15. Mechanical Spare Parts List….........................................…………52

16. Firmware Update Procedure …………………………………….. 53

1. Safety and Precautions

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.

Example of antenna grounding
As per national electrical code

Antenna lead in wire

Ground clamp

Antenna discharge
unit

Electric service

equipment

Power service
grounding
Electrode system unit

- 1 -

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 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.

- 2 -

2.1 Specification :

ITEMS SPECIFICATION

Model Name V32FLBB V32FCBB V32FMBB

Screen size/ Supplier 31.51” / LG panel 31.51” / CPT panel 32.02”/ CMO panel

Aspect Ratio 16：9 16：9 16：9

Resolution

Display

TV I/P

Video I/P

PC I/P

Audio I/P Audio I/P：L/R

Video O/P Composite Signal TV only

Audio O/P

Functions

Power

Dimension W x H x D 964.8mm x 580.4mm x 279.8mm

Wight (net) 22.2Kg (without Accessories)

Contrast ratio 600:1 (typ.) 800:1 (typ.) 800:1 (typ.)

Brightness 500cd/m2 (typ.) 500cd/m2 (typ.) 550cd/m2 (typ.)

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

OSD Language Chinese , English, French , German , Spanish

TV standard (CCIR) NTSC

TV Turning system PLL 181 Ch.

STEREO MTS+SAP

CATV 125 CH.

Composite Signal CVBS x 2

Y, C Signal S-Video x 2

Composite Signal YPbPr x 2 (720p, 1080i HDTV Ready)

Analog I/P 15 pin D-Sub Connector

Digital I/P 24 pin DVI Connector

PnP compatibility DDC / 2B (Analog) , DVI 1.0 / HDCP 1.0 (Digital)

I/P Frequency

Recommended 1024 x 768 (60Hz)

Audio O/P：L/P

Sound level output

500 mV(rms)

PIP, PoP, 3D de-interlace, 3D comb-filter , V-Chip , C.C. Settings Other

Aspect Ratio Full → Normal → Zoom → Panoramic → Subtitle

Power Supply AC 110V ~ 240V, 50/60Hz

Power Consumption ＜180W

2. Specifications

1366 x 768 (WXGA) 1366 x 768 (WXGA) 1366 x 768 (WXGA)

F

：31.5KHz to 60KHz

H

F

：56Hz to 75Hz

V

Audio 1：CVBS & S-Video x 2

Audio 2：Y Pb Pr x 2

Audio 3：PC x 1

Speaker (Built-in)：10W+10W (rms)

3.5mm miniature stereo phone jack

Accessories Remote Control, Batteries, AC cord , DVI-D cable (optional), user’s manual.

- 3 -

2.2 PC Input preset timing table

Mode

No.

Mode

Resolution

H.Freq
(KHZ)
V. F r e q

(Hz)

H.Polarity
V.Polarity

Pixel
CLK

(MHZ)

Hor.

Tot al

Hor.

Display

H.Back

Porch

Hor.

Sync.

Width

Ve r.

Tot al

Ve r.

Display

V.Back

Porch

Ve r.

Sync

Width

VGA 70HZ

1

VGA 60HZ

2

VGA 72HZ

3

VGA 75HZ

4

SVGA 60HZ

5

SVGA 60HZ

6

SVGA 72HZ

7

SVGA 75HZ

8

XGA 60HZ

9

640*350

640*480

640*480

640*480

800*600

800*600

800*600

800*600

1024*768

31.469

70.087

31.469

59.941

37.804

72.81

37.5

75.0

31.156

56.25

37.879

60.317

48.077

72.188

46.875

75.0

48.363

60.004

+

25.175 800 640 48 96 449 350 60 2

-

-

25.175 800 640 48 96 525 480 32 2

-

-

-

-

-

+
+

+
+

+
+

+
+

-

-

31.5 832 640 128 40 520 480 28 3

31.5 840 640 120 64 500 480 16 3

36.0 1024 800 128 72 625 600 22 2

40.0 1056 800 88 128 628 600 23 4

50.0 1040 800 64 120 666 600 23 6

49.5 1056 800 160 80 625 600 21 3

65.0 1344 1024 160 136 806 768 29 6

10

11

12

13

14

15

16

XGA 70HZ

1024*768

XGA 75HZ

1024*768

MAC VGA

640*480

MAC VGA

832*624

MAC VGA

1280*768

WXGA

1280*720

WXGA

1360*768

56.476

70.069

60.023

75.029

35.0

66.667

49.725

74.55

47.73
60

45
60

47.7
60

-

-

+
+

-

-

-

-

-

-

+
+

75.0 1328 1024 144 136 806 768 29 6

78.75 1312 1024 176 96 800 768 28 3

30.24 864 640 96 64 525 480 39 3

57.283 1152 832 224 64 667 624 39 3

80 1676 1280 198 136 795 768 23 3

74.25 1650 1280 220 40 750 720 20 5

85.5 768

- 4 -

3. Connection & Applications

3.1 DVI port for HDCP Input

D-sub port for PC Input

3.2 DVI port for PC Input
D-sub port for Video Input

- 5 -

3.3 Video Expand card Connection

A/V Out

Subwoofer

Out

Audio O/P : The level of audio output cannot be changed by using the Volume, Treble,

and Bass controls on your TV. These connectors should be used with an

external amplifier that can be used to control the volume.

Video O/P : The main display must set to TV mode in order to use video out to record a

program using a VCR.

- 6 -

4. Control Location

Rear Side

:

Before operating the LCD-TV or remote control, users must press MAIN POWER

switch to ON. The MAIN POWER switch is located at the bottom-left back of the

LCD-TV.

Front Side :

- 7 -

5.1 Remote Control :

VIDEO SWAP

5. Remote Control

- 8 -

5.2 Summary of Control Button

PPoowweerr ccoonnttrrooll

POWER button Turn the TV on or off

Selecting the primary signal source

TV button Switch to TV mode
AV button Switch to AV mode (composite mode)
SV button Switch to S-Video mode
CV button Switch to CV mode (component :Y/Pb/Pr)
PC button Switch to PC mode (DVI or D-sub)

Menu Settings

MENU/ENTER button Display the on-screen menu or enter a sub-menu
EXIT/(INFORMATION) button Exit a menu or sub-menu. (Option: Display the current

channel or current primary signal source.)

UP,DOWN,LEFT,RIGHT buttons

Access to menu items

TV Changing Channels

CHANNEL△ button
CHANNEL▽ button
0~9 ; +100 button Select channels manually

RTN button Return to the previous viewed channel

Press Up to change the channel
Press Down to change the channel

Sound Control

VOLUME △ button Increase volume level
VOLUME ▽ button Decrease volume level
MUTE button Temporarily turn off audio

MTS button

TREBLE button Adjust treble level

BASS button Adjust bass level

SUBWOOFER button Enable/Disable the subwoofer
AUDIO SWAP button Exchange audio source of Main display and Sub display

Cycle through Stereo, Mono or Separate Audio Program
(SAP) multi-channel sound services

PIP Control

ON/OFF button Enable/Disable PiP viewing window

Press again to make the sub display disappear

△/▽ button

Select PiP input source: TV→AV 1 →SV1→AV 2 →SV2

SIZE button

POSITION button Move the PiP window position
AUDIO SWAP button Exchange audio source of main display and PiP window

Toggle PiP window size: 10%→20%…………90%→
100%

Other Function

SWAP button

RESET button Return to the original factory settings.
ARC button (Aspect Ratio Control) PC mode：Set the picture mode to Full, Fill aspect, One

APC button (Automatic Picture Control) Toggle screen luminosity between Normal, Clear, Dark,

SLEEP button Select a pre-set time for automatic power down.
C.C. button Enable/Disabled closed captioning.

Exchange the main and Sub display

to one.
Video mode：Toggle the picture mode between normal
→Zoom→Full→Panoramic→Subtitle.

and Theater modes.

- 9 -

6. Disassembly Instructions

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

panel faceplate.

A. Pull down two hooks to open the bottom cover.

B. Pull down two hooks to open the side cover.

C. Remove 4 screws and then take base assembly apart from the LCD-TV.

D. Loose 2 screws and pull up the Video Expand Card.

- 10 -

E. Remove 10 screws from the back cover.

F. Remove 1 screw from the back cover, and then take back cover apart from the LCD

TV

G. Remove 4 screws from the VESA wall-mounting bracket.

H. Remove the shield of power box.

H.’ Remove 2 screws, and then disconnect 3 wire assemblies from power box.

H.” Remove 1 screw from shield of main board, and 4 hexagonal screws from the DVI

and D-Sub connectors.

H’’

G

H

H’

G

- 11-

I. Remove 8 screws from the Main board, and then take Main board apart from the

Panel bracket.

J. Remove 6 screws from the Panel Bracket.

- 12-

K. Take Panel Bracket apart from the Front Cover.

- 13 –

7. Block Diagram

- 14 -

8. Troubleshooting

8.1 Symptom Codes : ( for Call Center use )

CODE SYMPTOM COUNTERMEASURES

No picture and and no Sound

Poor Picture

NP1

NP2

NP3

NP4

NP5

PP1

PP2

PP3

PP4

No Picture and No Sound
in TV mode.

No Picture and No Sound
in video mode.

TV is automatically turned
off.
Screen appears “totally
snowy” in TV mode. After
10 min., it turns off
automatically.
Screen appears “No
Signal” in video mode.
After 10 min., it turns off
automatically.

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

Snowy picture and noisy
Sound

Distorted picture and
noisy sound
Dotted Lines / Stripes
in the picture.

z Make sure the Power cord and Antenna cable are

properly connected .

z Make sure the batteries in remote control are not

flat.

z Press the MAIN POWER switch to ON.
z Switch to TV source by pressing TV button.
z Select the correct signal source: “ANTENNA” or

“Cable- STD/ HRC/ IRC ” in OSD menu.

z Run “Auto Search ” in OSD menu.
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.

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

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, S V, or CV button on the remote control to

select the corresponding video source.

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.
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.

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

as broadcast signals may be too strong.
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.

-15-

CODE SYMPTOM COUNTERMEASURES

PP5

PP6

Poor Picture

PP7

NS1

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

No Sound or Noisy Sound

PC1 PC display is Not Full

PC2 Horizontal Noise or Color

PC3 “Out of Range” message z Maximum PC resolution supported is 1360x768

PC

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

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.
No color, too light or too
dark

Poor picture on particular
channel.

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

Screen

pattern is not uniform

z Adjust the picture settings —

Contrast, Saturation , Color Temp.

z Press RESET button on remote control to return all

settings to factory settings.

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

particular channel for optimal reception.

z Check audio connections between Equipment &

LCD-TV.

z Press MUTE or VOL Up to cancel the muting.

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.

z Select “Auto” 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

z Select “Auto” in OSD menu to optimize the image .
z If still no good , adjust “Phase” in OSD menu

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

z Reduce the resolution to 1360x 768 from the PC.

Note The panel resolution is 1366x768, which is not a

standard timing, so it may not suit for all PC graphic

cards.

APC, Brightness,

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.

-16-