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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.
Example of antenna grounding
As per national electrical code
Antenna lead in wire
Ground clamp Antenna discharge
unit
Electric service Grounding conductors
equipment 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 159
Resolution 1280 x 768 (WXGA)
Display Contrast ratio 400:1(typ)
Brightness 450cd/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.
TV I/P
STEREO MTS+SAP
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
PC I/P AnalogFH31.5KHz to 60KHz
I/P Frequency
FV 56Hz to 75Hz
Recommended Analog1024X768 (60Hz)
Audio 1CVBS & S-Video
Audio I/P Audio I/PL/Rx3 Audio 2Y, Pb, Pr
Audio 3PC
Video O/P Composite Signal TV only
Speaker (Build-in)5W+5W (rms)@THD<10%
Audio O/P Audio O/PL/Px3 3.5mm miniature stereo phone jack
Sound level output:500 mV(rms)
PIP,VoV,3D De-interlace, 3D
Yes
Other Functions comb-filter ,V-Chip, C.C. Settings
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 27wide TFT-LCD panel
Aspect Ratio 169
Resolution 1280 x 720(WXGA)
Display Contrast ratio 600:1 (typ)
Brightness 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.
TV I/P
STEREO MTS+SAP
CATV 125 CH.
Composite Signal CVBS
Y, C Signal S-Video
Video I/P
Composite Signal
HDTV system (720p, 1080i)
Y, Pb Pr
Signal I/P DVI-I Connector
PnP compatibility DDC / 2B
PC I/P AnalogFH31.5KHz to 60KHz
I/P Frequency
FV 56Hz to 75Hz
Recommended Analog1024X768 (60Hz)
Audio 1CVBS & S-Video
Audio I/P Audio I/PL/R x 3 Audio 2Y, Pb/Cb, Pr/Cr
Audio 3PC
Video O/P Composite Signal TV only
Speaker (Build-in)10W+10W (rms)
Audio O/P Audio O/PL/P x 3 3.5mm miniature stereo phone jack
Sound level output:500 mV(rms)
PIP,VOV,3D De-interlace, 3D
Yes
Other Functions comb-filter ,V-Chip, C.C. Settings
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 29.6wide TFT-LCD panel
Aspect Ratio 159
Resolution 1280 x 768 (WXGA)
Display Contrast ratio 600:1(typ)
Brightness 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.
TV I/P
STEREO MTS+SAP
CATV 125 CH.
Composite Signal CVBS
Y, C Signal S-Video
Video I/P
Composite Signal
HDTV Ready (720p, 1080i)
Y, Pb, Pr
Signal I/P DVI-I Connector
PnP compatibility DDC / 2B
PC I/P AnalogFH31.5KHz to 60KHz
I/P Frequency
FV 56Hz to 75Hz
Recommended Analog1024X768 (60Hz)
Audio 1CVBS & S-Video
Audio I/P Audio I/PL/Rx3 Audio 2Y, Pb/Cb, Pr/Cr
Audio 3PC
Video O/P Composite Signal TV only
Speaker (Build-in)10W+10W (rms)
Audio O/P Audio O/PL/Px3 3.5mm miniature stereo phone jack
Sound level output: 500 mV(rms)
PIP,VoV,3D De-interlace, 3D
Yes
Other Functions comb-filter ,V-Chip, C.C. Settings
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
Pixel
Mode Mode Name H.Freq.(KHZ) H. Polarity
CLK
No. Resolution V.Freq.(HZ) V. Polarity
(MHZ)
1 VGA 70HZ 31.469
25.175
640*350 70.087
2 VGA 60HZ 31.469
25.175
640*480 59.941
3 VGA 72HZ 37.861
31.5
640*480 72.81
4 VGA 75HZ 37.5
31.5
640*480 75.0
5 SVGA 60HZ 35.16
36.0
800*600 56.25
6 SVGA 60HZ 37.879
40.0
800*600 60.317
7 SVGA 72HZ 48.077
50.0
800*600 72.188
8 SVGA 75HZ 46.875
49.5
800*600 75.0
9 XGA 60HZ 48.363
65.0
1024*768 60.004
10 XGA 70HZ 56.476
75.0
1024*768 70.069
11 XGA 75HZ 60.023
78.75
1024*768 75.029
12 MAC VGA 35.0
30.24
640*480 66.667
13 MAC VGA 49.725
57.283
832*624 74.550
14 US TEXT 31.469
28.322
720*400 70.087
15 WXGA 47.73
80
1280*768 60
16 WXGA 45
74.25
1280*720 60
8
PC I/P
Pixel
Mode Mode Name H.Freq.(KHZ) H. Polarity
CLK
No. Resolution V.Freq.(HZ) V. Polarity
(MHZ)
1 VGA 70HZ 31.469
25.175
640*350 70.087
2 VGA 60HZ 31.469
25.175
640*480 59.941
3 VGA 72HZ 37.861
31.5
640*480 72.81
4 VGA 75HZ 37.5
31.5
640*480 75.0
5 SVGA 60HZ 35.16
36.0
800*600 56.25
6 SVGA 60HZ 37.879
40.0
800*600 60.317
7 SVGA 72HZ 48.077
50.0
800*600 72.188
8 SVGA 75HZ 46.875
49.5
800*600 75.0
9 XGA 60HZ 48.363
65.0
1024*768 60.004
10 XGA 70HZ 56.476
75.0
1024*768 70.069
11 XGA 75HZ 60.023
78.75
1024*768 75.029
12 MAC VGA 35.0
30.24
640*480 66.667
13 MAC VGA 49.725
57.283
832*624 74.550
14 US TEXT 31.469
28.322
720*400 70.087
15 WXGA 47.73
80
1280*768 60
16 WXGA 45
74.25
1280*720 60
8
DVI I/P
Pixel
Mode Mode Name H.Freq.(KHZ) H. Polarity
CLK
No. Resolution V.Freq.(HZ) V. Polarity
(MHZ)
VGA 60HZ 31.469 25.175
1
640*480 59.941 DVI
SVGA 60HZ 37.879 40.0
2
800*600 60.317 DVI
XGA 60HZ 48.363 65.0
3
1024*768 60.004 DVI
US TEXT 31.47 28.320
4
720*400 70.08 DVI
9
3. Connection & Applications
(TV only)
10
Video Input device
DVD player
Satellite receiver
Set top box
VIDEO Inputdevice
Digital Camera
Note: Satellite receive
Set top box
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.
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.
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:
Sleep
TV Power
PC
Number Buttons
AV
SV
CV Return
Channel UP
SWAP Mute
MENU/Enter
VOL VOL+
Reset TITLE / EXIT
Channel DOWN
ARC APC
Subwoofer
Other Function Audio Function
PIP Function
13
Summary of Control Button
Power control
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 Adjust the bass of audio.
Press SUBWOOFER button. 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 TVAVSVCV 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 toTop LeftTop RightBottom Right
Bottom LeftRepeat
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 sourceSet the picture window to full or normal.
In Video sourceSet the picture window to normalfullperiscopezoom.
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
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")
D
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 F
G
G
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.
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
7. Block Diagram
ANT
UT01 I044 I010 10W + 10W
TV