V23D/V27D/V30D series
LCD-TV(NTSC)
Service Manual
Date: April 15, 2005
Ver. : 1.1
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.
Electric service
equipment
Example of antenna grounding
As per national electrical code
Ground clamp
Antenna lead in wire
Antenna discharge
unit
Grounding conductors
Ground clamps
Power service
grounding
Electrode system unit
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
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
Display
Contrast ratio 400:1(typ)
Brightness 450cd/m
Viewing Angle Over 170∘(Hor.) / 170∘(Vert.)
OSD Language Chin ese , English, French , German , Spanish
TV standard (CCIR) NTSC
TV I/P
Video I/P
PC I/P
Audio I/P Audio I/P：L/Rx3
Video O/P Composite Signal TV only
Audio O/P Audio O/P：L/Px3
Other Functions
Power
Wight (net) 10.3Kg (Ref.) (Without Accessories)
TV Turning system PLL 181 Ch.
STEREO MTS+SAP
CATV 125 CH.
Composite Signal CVBS
Y, C Signal S-Video
Composite Signal
Y, Pb Pr
Signal I/P DVI-I Connector
PnP compatibility DDC / 2B
I/P Frequency
Recommended Analog：1024X768 (60Hz)
PIP,VoV,3D De-interlace, 3D
comb-filter ,V-Chip, C.C. Settings
Aspect Ration Switching Normal → Periscope → Zoom →Full
Power Supply AC 110V ~ 240V, 50/60Hz
Power Consumption ＜115W
1280 x 768 (WXGA)
HDTV system (720p, 1080i)
Analog：F
F
Audio 1：CVBS & S-Video
Audio 2：Y, Pb, Pr
Audio 3：PC
Speaker (Build-in)：5W+5W (rms)@THD<10%
3.5mm miniature stereo phone jack
Sound level output:：500 mV(rms)
Yes
2
(typ)
：31.5KHz to 60KHz
H
：56Hz to 75Hz
V
Accessories Remote Control, Batteries, AC power cord
5
V27DXXX
ITEMS SPECIFICATION
Screen size 27＂wide TFT-LCD panel
Aspect Ratio 16：9
1280 x 720(WXGA)
Display
Resolution
Contrast ratio 600:1 (typ)
Brightness 550cd/m
Viewing Angle Over 170∘(Hor.) / 170∘(Vert.)
OSD Language Chin ese, English, French, German, Spanish
TV standard (CCIR) NTSC
TV I/P
Video I/P
PC I/P
Audio I/P Audio I/P：L/R x 3
Video O/P Composite Signal TV only
Audio O/P Audio O/P：L/P x 3
Other Functions
Power
Wight (net) 14.5Kg (Ref.) (Without Accessories)
TV Turning system PLL 181 Ch.
STEREO MTS+SAP
CATV 125 CH.
Composite Signal CVBS
Y, C Signal S-Video
Composite Signal
Y, Pb Pr
Signal I/P DVI-I Connector
PnP compatibility DDC / 2B
I/P Frequency
Recommended Analog：1024X768 (60Hz)
PIP,VOV,3D De-interlace, 3D
comb-filter ,V-Chip, C.C. Settings
Aspect Ration Switching Normal → Periscope → Zoom →Full
Power Supply AC 110V ~ 240V, 50/60Hz
Power Consumption ＜140W
HDTV system (720p, 1080i)
Analog：F
F
Audio 1：CVBS & S-Video
Audio 2：Y, Pb/Cb, Pr/Cr
Audio 3：PC
Speaker (Build-in)：10W+10W (rms)
3.5mm miniature stereo phone jack
Sound level output:：500 mV(rms)
Yes
2
(Typ)
：31.5KHz to 60KHz
H
：56Hz to 75Hz
V
Accessories Remote Control, Batteries, AC power cord
6
V30DXXX
ITEMS SPECIFICATION
Screen size 29.6＂wide TFT-LCD panel
Aspect Ratio 15：9
Resolution
Display
TV I/P
Video I/P
PC I/P
Audio I/P Audio I/P：L/Rx3
Video O/P Composite Signal TV only
Audio O/P Audio O/P：L/Px3
Other Functions
Power
Wight (net) 15.2Kg (Ref.) (Without Accessories)
Contrast ratio 600:1(typ)
Brightness 550cd/m2 (Typ)
Viewing Angle Over 170∘(Hor.) / 170∘(Vert.)
OSD Language Chin ese , English, French , German , Spanish
TV standard (CCIR) NTSC
TV Turning system PLL 181 Ch.
STEREO MTS+SAP
CATV 125 CH.
Composite Signal CVBS
Y, C Signal S-Video
Composite Signal
Y, Pb, Pr
Signal I/P DVI-I Connector
PnP compatibility DDC / 2B
I/P Frequency
Recommended Analog：1024X768 (60Hz)
PIP,VoV,3D De-interlace, 3D
comb-filter ,V-Chip, C.C. Settings
Aspect Ration Switching Normal → Periscope → Zoom →Full
Power Supply AC 110V ~ 240V, 50/60Hz
Power Consumption ＜150W
1280 x 768 (WXGA)
HDTV Ready (720p, 1080i)
Analog：F
F
Audio 1：CVBS & S-Video
Audio 2：Y, Pb/Cb, Pr/Cr
Audio 3：PC
Speaker (Build-in)：10W+10W (rms)
3.5mm miniature stereo phone jack
Sound level output: 500 mV(rms)
Yes
：31.5KHz to 60KHz
H
：56Hz to 75Hz
V
Accessories Remote Control, Batteries, AC cord, AC power cord
7
PC I/P
Mode
No.
1 VGA 70HZ
2 VGA 60HZ
3 VGA 72HZ
4 VGA 75HZ
5 SVGA 60HZ
6 SVGA 60HZ
7 SVGA 72HZ
8 SVGA 75HZ
9 XGA 60HZ
10 XGA 70HZ
11 XGA 75HZ
12 MAC VGA
13 MAC VGA
14 US TEXT
15 WXGA
16 WXGA
Mode Name
Resolution
640*350
640*480
640*480
640*480
800*600
800*600
800*600
800*600
1024*768
1024*768
1024*768
640*480
832*624
720*400
1280*768
1280*720
H.Freq.(KHZ)
V.Freq.(HZ)
31.469
70.087
31.469
59.941
37.861
72.81
37.5
75.0
35.16
56.25
37.879
60.317
48.077
72.188
46.875
75.0
48.363
60.004
56.476
70.069
60.023
75.029
35.0
66.667
49.725
74.550
31.469
70.087
47.73
60
45
60
H. Polarity
V. Polarity
＋
－
－
－
－
－
－
－
＋
＋
＋
＋
＋
＋
＋
＋
－
－
－
－
＋
＋
－
－
－
－
－
＋
－
－
＋
＋
Pixel
CLK
(MHZ)
25.175
25.175
31.5
31.5
36.0
40.0
50.0
49.5
65.0
75.0
78.75
30.24
57.283
28.322
80
74.25
8
PC I/P
Mode
No.
1 VGA 70HZ
2 VGA 60HZ
3 VGA 72HZ
4 VGA 75HZ
5 SVGA 60HZ
6 SVGA 60HZ
7 SVGA 72HZ
8 SVGA 75HZ
9 XGA 60HZ
10 XGA 70HZ
11 XGA 75HZ
12 MAC VGA
13 MAC VGA
14 US TEXT
15 WXGA
16 WXGA
Mode Name
Resolution
640*350
640*480
640*480
640*480
800*600
800*600
800*600
800*600
1024*768
1024*768
1024*768
640*480
832*624
720*400
1280*768
1280*720
H.Freq.(KHZ)
V.Freq.(HZ)
31.469
70.087
31.469
59.941
37.861
72.81
37.5
75.0
35.16
56.25
37.879
60.317
48.077
72.188
46.875
75.0
48.363
60.004
56.476
70.069
60.023
75.029
35.0
66.667
49.725
74.550
31.469
70.087
47.73
60
45
60
H. Polarity
V. Polarity
＋
－
－
－
－
－
－
－
＋
＋
＋
＋
＋
＋
＋
＋
－
－
－
－
＋
＋
－
－
－
－
－
＋
－
－
＋
＋
Pixel
CLK
(MHZ)
25.175
25.175
31.5
31.5
36.0
40.0
50.0
49.5
65.0
75.0
78.75
30.24
57.283
28.322
80
74.25
8
DVI I/P
Mode
No.
1
2
3
4
Mode Name
Resolution
VGA 60HZ
640*480
SVGA 60HZ
800*600
XGA 60HZ
1024*768
US TEXT
720*400
H.Freq.(KHZ)
V.Freq.(HZ)
31.469
59.941
37.879
60.317
48.363
60.004
31.47
70.08
H. Polarity
V. Polarity
－
－
＋
＋
－
－
＋
＋
Pixel
CLK
(MHZ)
25.175
DVI
40.0
DVI
65.0
DVI
28.320
DVI
9
3. Connection & Applications
(TV only)
10
Video Input device
˙DVD player
˙Satellite receiver
˙Set top box
˙VIDEO Inputdevice
˙Digital Camera
Note:
z Audio out: The level of Audio O/P is constant. It won’t be affected by aligning volume, treble and bass.
˙Satellite receive
˙Set top box
This connecter should be connected to outer audio amplifier to enlarge the volume.
z Video 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.
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.
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).
Speaker Speaker
Remote sensor window
Aim the remote control towards this region on the TV.
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:
Other Function
PIP Function
TV
PC
AV
SV
CV
SWAP
VOL－
Reset
ARC
Subwoofer
Sleep
Power
Number Buttons
Return
Channel UP
Mute
MENU/Enter
VOL+
TITLE / EXIT
Channel DOWN
APC
Audio 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
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.
PIP Control
Press ON/OFF button Press to watch one of video sources on sub display. Press again to make the
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→
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.
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.
multi-channel sound services.
Adjust the bass of audio.
Open the subwoofer function.
sub display disappear.
Bottom Left→Repeat
In Video source：Set the picture window to normal→full→periscope→zoom.
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
A
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.
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
D
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
F
G
G
16
I
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.
H
H
J
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
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 .
L
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.
M
18
19
t
g
7. Block Diagram
ANT
UT01
TV – Tuner
(Philips)
FQ1236 MK3
SIF
Audio
Video
I044
4:1
MTS & Audio Processor
MSP3440G
CV Audio
SV/A V Audio
PC Audio
I010
Audio Amp.
TFA9843)
10W + 10W
Speaker
Headphone
Subwoofer
CV
SV
AV
I033
V-Chip
Z8612912
I024
PI5V330
I035
3D Comb filter
TC90A65F
(or UPD64083)
VGA
DVI
PC
Interlaced
Pro
Interlaced
TV/AV
Video Decoder
SAA7117
ressive
ADC
AD9883A
Video Decoder
SAA7117
ADC
Silicon Image
Sil169
I018
8 bi
I006
I038
RAM
I031
I001
I040
I035
HY57V64
I037
De-Interlace
SiI504C
I032
P15V330
24 bit
Sync.
I019
Port V(Sub)
Scaler
TP6761
Port B(Main)
Port A(Main)
2
I
C
I009
Interface
THC63
LVDM83A
I020
RAM
HY57V16
LCD
Panel
23”/27”/30”
20
Remote Control
I013
IR Pad
Key Pad
I012
Micro Controller
TP2808)
INVERTER
E2PROM
8. Troubleshooting
8.1 Symptom Codes :
CODE SYMPTOM COUNTERMEASURES
NP1
NP2
NP3
No Picture and No Sound
in TV mode.
No Picture and No Sound
in video mode.
TV is automatically turned
off.
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.
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.
No picture and and no Sound
Poor Picture
NP4
NP5
PP1
PP2
PP3
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
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, SV, 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.
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
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 1280x768
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 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
z Select “Auto Image” 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 to1280x768 from the PC.
Note
20〞panel resolution is 640 x 480.
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.
22
CODE SYMPTOM COUNTERMEASURES
RC1 Remote Control does not
work
RC2 Can not change channels
Remote Control
PH1
NG1
with the remote control
Picture suddenly Stops
Responding or
abnormal.
Issues can’t be solved. z If the picture still abnormal, execute “ Clear
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.
z Press TV button to switch to TV mode.
z Press RESET button on remote control .
z Unplug and then plug the Power Cord of the TV from
the AC outlet.
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.
Picture Halt / Abnormal
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.
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.
Note
23
N
plug
plug
plug
plug
8.2 Troubleshootin g Flow Chart
（1）Power Start NG
Restart and check
No
sources are
connected
Yes
Picture
appears
Re-
No picture
No picture Appear
Does the LED
light up？
否
Yes
No
Replace I029
Is the Voltage at
I029#8= 5V？
No
0~0.5V
Measure of
I029#4 =? volt
3~5V
Picture
appears
Picture
appears
Picture
appears
Re-
No picture
Erase
EEPROM
No picture
Re-
No picture
No
Panel wire (P005) is
connected correctly?
Yes
Yes
Check if panel
light works?
o
White connector of
No
power Module (8p
or 12p) is connected
correctly?
Yes
Measure white connectors
of 2 sides pin voltage that
are at 3V and 24V
Yes
No
Is LED display
Amber？
Is it entering into
power saving on PC
mode?
Restart signal to
ensure H. V.
sync are not
Yes
Yes
absent
End
否
No
Picture
appears
Replace I012(MCU)
Picture
appears
Replace Main Board
PWB-0812
Picture
appears
Erase
EEPROM
No picture
No picture
No picture
Fix at
factory
Picture
appears
Replace Power
Module, test
again.
No picture
No
Picture
appears
No
Re-plug white connector,
then measure voltage
again
Yes Yes
Replace Inverter,
test again.
No picture
24
Check if inverter is
connected correctly.
Picture
appear
No
Re-
No picture
(2) Picture abnormal
The Ver. Or Hor .
Sync. does not
hold
in any source
Erase
EEPROM, and
then check the
picture is
Yes
No
Are the panel
cables (P005)
attached
correctly?
Yes
Replace V901
(LCD panel)
No
Re-plug the
panel cable, and
check the
picture
Yes
Check side SMD of
No
I019&I020 is welded
correctly?
Yes
After welding,
then check the
picture.
Change main
board (PWB-0812),
Yes
and check picture.
Change Power
Yes
Module, and check
否
No
Yes
No
No
picture
No
Change Inverter
Yes
and check picture
End
No
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
WBK
V30D-U21
MP 1.1
´Custom
´Model NO.
´Edition
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
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
CV
(
)
V
(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)：
SV
AV
I033
-Chip
Z8612912
I024
PI5V330
I035
3D Comb filter
TC90A65F
or UPD 64083
VGA
ANT
Interlaced
Progressive
Interlaced
TV/AV
PC / Component Video
TV – Tuner
UT01
(Philips)
FQ1236 MK3
I018
Video Decoder
SAA7117
I006
ADC
AD9883A
I031
Video Decoder
SAA7117
I001
ADC
AD9883A
SIF
Audio
Video
CV Audio
SV/A V Audio
PC Audio
I038
RAM HY57V64
I03
De-Interlace
SiI504C
I032
P15V3
I044
4:1
MTS & Audio
Processor
MSP3440G
8 bit
24 bit
Sync.
24 bit
I019
Port
V(Sub)
Scaler
TP6761
Port
B(Main)
I010
Audio Amp.
TFA9843)
I009
Interface
I020
THC63
RAM
HY57V16
10W +
10W
Speaker
Headphone
LCD
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.
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 different
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
TFT Panel
EE
PARTS
Inverter
Power
Module
V23DXXX V27DXXX V30DXXX
LG
LC230W015051253665
(include
Inverter)
panel is
included
6693006615(RA)
6693006611(RB)
CMO V270W1
1.5051253656
(include
Inverter)
panel is
included
1.HOAU242001
150W
6693006610(RA)
2.PHIHONG
150W
6693006601(RB)
CMO V296W1
1.5051253668
(include
Inverter)
panel is
included
6693006610(RA)
6693006601(RB)
NOTE
Tuner
Board
I/O Board
IR Board
Key Board
PWB-0707
U12-5097632521
PWB-0612
U12-5097624527
PWB-0739-2
U12-5098800942
PWB-0739-1
U12-5098800941
PWB-0707
U05-5097632508
U12-5097632519
U21-5097632519
PWB-0612
U05-5097624513
U12-5097624523
U21-5097624523
PWB-0739-2
U05-5098800801
U12-5098800908
U21-5098800908
PWB-0739-1
U05-5098800800
U12-5098800907
U21-5098800907
PWB-0707
U05-5097632509
U21-5097632523
PWB-0612
U05-5097624514
U21-5097624530
PWB-0739-2
U05-5098800803
U21-5098800969
PWB-0739-1
U05-5098800802
U21-5098800968
Main
Board
PWB-0812
U12-5097641403
65
PWB-0812
U05-5097641400
U12-5097641402
U21-5097641402
PWB-0812
U05-5097641401
U21-5097641405
Speaker
Remote
control
MCU
Signal
Cable
U12-5055123800 U05-5055126200
U12-5055126200
6647021817 6647021817 6647021817
DVI-I cable
U05-5052731052
U12-5052731043
U21-5000100072
U05-5057424010
U21-5057424010
U05-5055125600
U21-5055123700
U05-5052731052
U21-5000100072
DVI-I cable
U05-5057424010
U21-5057424010
Note:
Different
model have
different
firmware
version.
ME
PARTS
Power
Cord
User＇s
Manual
Front
Cover
Back
Cover
Base
U12-5056705900 U05-E056705900
U12-5056705900
U21-5056705900
U12-5030007049 U05-5030057109
U12-5030057126
U12-5641101101 U05-5641101601
U12-5641101003
U21-5641101002
U12-5642294312 U05-5642292206
U12-5642292209
U21-5642292210
U12-5641416405 U05-5640410000
U12-5641412707
U05-E056705900
U21-5056705900
U05-5030057109
U21-5030057146
U05-5641101401
U21-5642298207
U05-5642292010
U21-5642292018
U05-5640410000
U21-5641412707
U21-5641416305
66
13. Mechanical Disassembly
67
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