Tatung V23CLTT User manual

0
Date: Aug 10, 2004
Ver. : 1.0
V23CLTT/V27CMTT/V30CMTT
LCD-TV
Service Manual

Table of contents
1. Precautions & Notice.......................................………………….3
2. Features & Specifications............................................………….5
3. Connection & Applications…………………….....……………..9
4. Controls Location .........................................................................11
5. Remote Control.............................................…….……….….....12
6. Disassembly Instructions.......................…………………..……14
7. Block Diagram....................................................……..…………19
8. Troubleshooting Flow Chart.............................................……..20
9. Electronic Circuit Description................................................…23
10. Circuit Diagram....................................................…………….27
11. PCB Layout....................................................…………………46
12. Electrical Part List.............................................. …………….61
13. Mechanical Disassembly....….......... …....................………....62

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

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.
1.2Product 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. Specifications
Specification
V23CLTT
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/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/Cb, Pr/Cr HDTV system (720p, 1080i)
Signal I/P Analog：15 pin D-Sub Connector
PnP compatibility DDC / 2B
I/P Frequency Analog：FH：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)：5W+5W (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 ＜115W
Panel Tilt Forwards/ Backwards /Rotation -5∘/ +20∘/ ± 180∘
Wight (net) 10.5Kg (Without Accessories)

Accessories Remote Control, Batteries, AC cord, 15 Pin D-Sub Signal Cable
V27CMTT
ITEMS SPECIFICATION
Screen size 27＂wide TFT-LCD panel
Aspect Ratio 16：9
Resolution 1280 x 720(WXGA)
Contrast ratio 500:1 (typ)
Brightness 500cd/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/Cb, Pr/Cr HDTV system (720p, 1080i)
Signal I/P Analog：15 pin D-Sub Connector
PnP compatibility DDC / 2B
I/P Frequency Analog：FH：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
Panel Tilt Forwards/ Backwards /Rotation -5∘/ +20∘/ ± 180∘
Wight (net) 14.5Kg (Without Accessories)
Accessories Remote Control, Batteries, AC cord, 15 Pin D-Sub Signal Cable

V30CMTT
ITEMS SPECIFICATION
Screen size 29.6＂wide TFT-LCD panel
Aspect Ratio 15：9
Resolution 1280 x 768 (WXGA)
Contrast ratio 500:1(typ)
Brightness 500cd/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/Cb, Pr/Cr HDTV Ready (720p, 1080i)
Signal I/P Analog：15 pin D-Sub Connector
PnP compatibility DDC / 2B
I/P Frequency Analog：FH：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
Panel Tilt Forwards/ Backwards /Rotation -5∘/ +20∘/ ± 180∘
Wight (net) 15.2Kg (Without Accessories)
Accessories Remote Control, Batteries, AC cord, 15 Pin D-Sub Signal Cable

PC I/P
Preset Timing
Mode NO. Mode Name
Resolution H.Freq. (kHz) V.Freq. (Hz) H. Polarity V. Polarity
Pixel
CLK
(MHZ)
1 VGA 70Hz
640X350
31.469
70.087 ＋
－25.175
2 VGA 60Hz
640X480
31.469
59.941 －
－25.175
3 VGA 72Hz
640X480
37.861
72.81 －
－31.5
4 VGA 75Hz
640X480
37.5
75.0 －
－31.5
5 SVGA 60Hz
800X600
35.16
56.25 ＋
＋36.0
6 SVGA 60Hz
800X600
37.876
60.317 ＋
＋40.0
7 SVGA 72Hz
800x600
48.077
72.118 ＋
＋50.0
8 SVGA 75Hz
800x600
46.875
75.0 ＋
＋49.5
9 XGA 60Hz
1024x768
48.363
60.004 －
－65.0
10 XGA 70Hz
1024x768
56.476
70.069 －
－75.0
11 XGA 75Hz
1024x768
60.023
75.029 ＋
＋78.75
12 MAC VGA
640X480
35.0
66.667 －
－30.24
13 MAC VGA
832x624
49.725
74.550 －
－57.283
14 US TEXT
720x400
31.469
70.087 －
＋28.322
15 WXGA
1280x768
47.73
60.0 －
－80

3. Connection & Applications

Note:
zAudio 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.
zVideo O/P: When user wants to connect Audio and Video O/P of our LCD-TV to VCR for recording
program, the O/P has only one choice that is TV mode.
zAudio 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.

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

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

Summary of Control Button
P
Po ow we er r c co on nt tr ro ol l
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
PressSUBWOOFERbutton. 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 Right→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.

6. Disassembly Instructions
1. Face down the LCD-TV :
Face down the LCD-TV on a smooth plane with a soft material to protect the panel faceplate.
2. Base Neck Removal Procedure :
2.1 Remove 2 screws from Neck Cover. (Indicated as “ A “)
Then you could take the Back Cover of neck apart from the LCD-TV
3. Base Removal Procedure:
3.1 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

4. Tuner Cover & AV Cover Removal Procedure:
4.1 Remove Tuner Cover. (Indicated as “D”)
4.2 Remove AV Cover before, you should be loose the screw (Indicated as “E”)
5. Back Cover Removal Procedure:
5.1 Remove 8 screws from the Back Cover. ( Indicated as “ F “and “ G “ )
5.2 Remove a screw from the Tuner Board. (Indicated as “ I ”)
5.3 Take slide of tuner board.
Then you could take Back Cover apart from the LCD-TV.
F
G
G
F
E D
I

6. . 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.
7Main PCB Shield Removal :
7.1 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

8. Main PCB Removal procedure:
8-1Remove 9 screws from the Main PCB. (indicated “ L “)
Then you could take Main PCB apart from the LCD-TV .
9. Panel Bracket Removal procedure:
9-1Remove 4 screws from the Panel Bracket. (Indicated as “ M ”)
Then you could take Panel Bracket apart from the Front Cover.
L
M

UT01 I044 I010
I033
I024
I035
I018
I006
I031
I001
I038
I037
I032
I019
I020
I009
I013
I012
7. Block Diagram
Video Decoder
SAA7118
(
or SAA7119
)
De-Interlace
SiI504C
ADC
AD9883
A
Scaler
TP6760
(or TP6761)
LCD
Panel
23”
Micro Controller
SM59264
(
or TP2808
)
Ke
y
Pad
INVERTER
E2PROM
IR Pad
ADC
AD9883A
Video Decoder
SAA7118
(or SAA7119)
Remote Control
8 bi
t
CV
SV
Interlaced
Pro
g
ressive
24 bit
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.
LA4282
(or TFA9843)
CVAudio
SV/AVAudio
PC Audio
ANT
Audio
P15V330
TV/AV
Interlaced
Sync.
VGA
I2C
SIF
Video
PC / Com
p
onent Video
AC100
~
240V 50/60Hz Power
Module
+5V
+24V
Regulator 3.3V
2.5V
1.8V
RAM
HY57V64
RAM
HY57V16
Interface
THC63
LVDM83A
Note: Main Board
PWB-0610-01~04 uses SAA7118、TP6760、TC90A65F。
PWB-0610-11above uses SAA7119、TP6761、UPD64083。

8. Troubleshooting Flow Chart
3~5V
Measure of I029
volt
No
Yes
否
0~0.5V
Replace I029
Yes
No
No picture
No picture
Clean
EEPROM
Picture
appears
Replace I012(MCU)
Fix at
factory
No picture
Yes
Restart and check
sources are
connected
discharge white
connector, then measure
voltage again
Check if inverter is
connected correctly.
Yes
N
o
Panel wire (P005) is
connected correctly?
Re-
char
g
e
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-0610
No
No
No
Yes
Re-ch
ar
g
e
No picture
No picture
No picture
No picture
Re-ch
ar
g
e
No
Yes Yes
Picture
appears
No
Yes
Is the Voltage at
L067 5V？No
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-ch
ar
g
e
No pictureAppear
Picture
appears
Picture
appears
Picture
appears
Picture
appears
Replace Power
Module, test
again.
Clean
EEPROM
Picture
appears
（1）Power Start NG