AOC L32W451, L32W451B Schematic
32’’ LCD TV Color Monitor AOC L32W451
Service
Service
Service
Horizontal Frequency
31.5KHz- 48KHz
TABLE OF CONTENTS
Description Page Description Page
Table Of Contents.......……..............................…........1
Revision List.…........................................……......2
1. Monitor Specification..............................………........3
2. Operating Instructions…………………….……….......5
2.1 The Use Of Remote Control..……………...................5
2.2 The Use Of Teletext……..........…...........…...........6
2.3 Front Panel Control Knobs.…............……...............7
2.4 OSD Operations .………........................…............8
2.5 How To Connect ……..............……………............16
3 Input/Output Specification…………..........................20
3.1 Input Signal Connector……..........................20
3.2 RGB Input Signal Timing …….....……......................21
4. Mechanical Instructions…………………..................22
5. Repair Flow Chart ……………………….……….....26
6. White Balance Luminance Adjustment….…........32
7. PCB Layout ………….……………………....….......36
SAFETY NOTICE
ANY PERSON ATTEMPTING TO SERVICE THIS CHASSIS MUST FAMILIARIZE HIMSELF WITH THE
7.1 Main Board.……….......................................36
7.2 Power Board……..……..............................38
7.3 Key Board…...................................41
7.4 IR Board …................….......................41
7.5 DC-DC Board....…………...............................43
7.6 Earphone Board..…….....…..........................44
8. Block Diagram.…….........................................45
8.1 Main Board.………………………………..….45
8.2 Power Board…..…....………………….......46
8.3 Exploded View..……….....................…..47
9. Schematic Diagram………………………...48
9.1 Main Board………..………………………..48
9.2 Power Board.....…...................................60
9.3 Tuner Board...…….......................................62
9.4 Earphone Board………….………………….65
10. BOM List…......................................................66
CHASSIS AND BE AWARE OF THE NECESSARY SAFETY PRECAUTIONS TO BE USED WHEN SERVICING
ELECTRONIC EQUIPMENT CONTAINING HIGH VOLTAGES.
CAUTION: USE A SEPARATE ISOLATION TRANSFOMER FOR THIS UNIT WHEN SERVICING
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32’’ LCD TV Color Monitor AOC L32W451
Revision List
Version Release Date Revision Instructions TPV Model
A00 Aug.-10-2006 Initial Release EJF5MTNBC3A3TMP
E325MTNBW3AC2P
A01 Aug.-30-2006 Add TPV model in item 10
E325MTNLW3MGNP
A02 Oct.-31-2006 Add TPV model in item 10 E325MTNLW3MKNP
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32’’ LCD TV Color Monitor AOC L32W451
1. Monitor Specifications
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32’’ LCD TV Color Monitor AOC L32W451
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32’’ LCD TV Color Monitor AOC L32W451
2. Operations Instructions
2.1 The Use Of Remote Control
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32’’ LCD TV Color Monitor AOC L32W451
2.2 The Use Of Teletext
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32’’ LCD TV Color Monitor AOC L32W451
2.3 Front Panel Control Knobs
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32’’ LCD TV Color Monitor AOC L32W451
2.4 OSD Operations
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32’’ LCD TV Color Monitor AOC L32W451
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32’’ LCD TV Color Monitor AOC L32W451
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32’’ LCD TV Color Monitor AOC L32W451
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32’’ LCD TV Color Monitor AOC L32W451
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32’’ LCD TV Color Monitor AOC L32W451
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32’’ LCD TV Color Monitor AOC L32W451
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32’’ LCD TV Color Monitor AOC L32W451
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32’’ LCD TV Color Monitor AOC L32W451
2.5 How to Connect
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32’’ LCD TV Color Monitor AOC L32W451
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32’’ LCD TV Color Monitor AOC L32W451
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32’’ LCD TV Color Monitor AOC L32W451
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32’’ LCD TV Color Monitor AOC L32W451
3. Input/Output Specification
3.1 Input Signal connector
This procedure gives you instructions for installing and using the LCD TV display.
Lay the display on the desired operation and plug the power cord into a convenient AC outlet. Three-wire p ower cord
must be shielded and is provided as a safety precaution as it connects the chassis and cabinet to the electrical
conduct ground. If the AC outlet in your location does not have provisions for the grounded type plug, the installer
should attach the proper adapter to ensure a safe ground potential.
Connect the 15-pin D-SUB color display shielded signal cable to your signal sy stem device and lock both scre ws on
the connector to ensure firm grounding. The connector information is as follow:
1
6
11 15
5
10
15 - Pin Color Display Signal Cable
Pin No. Description
1 Red Video
2 Green Video
3 Blue Video
4 Not used
5 GROUND
6 Red Video Ground
7 Green Video Ground
8 Blue Video Ground
9 No Pin
10 Sync. Ground
11 Not used
12 Serial Data for DDC
13 Horizontal Sync.
14 Vertical Sync.
15 Serial Clock for DDC
Apply power to the display by turning the power switch to the "ON" position and allow about ten seconds fo r Panel
warm-up. The Power-On indicator lights "GREEN" when the display is on.
With proper signals feed to the display, a pattern or data should appear on the screen, adjust the brightness and
contrast to the most pleasing display, or press auto-adjust to get the best picture-quality.
This TV (with PC function) has power saving function following the VESA DPMS. Be sure to connect the signal
cable to the PC.
If your TV requires service, it must be returned with the power cord.
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32’’ LCD TV Color Monitor AOC L32W451
3.2 RGB Input Signal Timing
Horizontal Vertical Sync Polarity Presence Screen Mode
Dots × Lines
720×400 31.47 70.08
640×480 31.50 60.00
640×480 37.50 75.00
640×480 37.86 72.81
800×600 37.90 60.32
800×600 46.90 75.00
800×600 48.08 72.19
1024×768 48.40 60.00
1280×768 47.7 60
Frequency Frequency Horizontal Vertical Horizonta Vertical Normal FULL
(kHz) (Hz) (4:3) (16:9)
NEG POS YES YES YES YES
NEG NEG YES YES YES YES
NEG NEG YES YES YES YES
NEG NEG YES YES YES YES
NEG NEG YES YES YES YES
NEG NEG YES YES YES YES
NEG NEG YES YES YES YES
YES YES YES YES YES YES
YES YES YES YES YES YES
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32’’ LCD TV Color Monitor AOC L32W451
4. Mechanical Instructions
Step Figure Description
Lay the LCD-TV
Preparation
on a flat, soft and
clean surface.
Remove
the base
Remove
the stand
Remove the
hinge cover
Remove the
screws on the
stand to remove
the stand.
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32’’ LCD TV Color Monitor AOC L32W451
Remove the
Remove
the back
cover
screws mark in
red to remove the
back cover.
Remove
the shield
and plate
Remove the
screws to
remove shield
and plate.
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32’’ LCD TV Color Monitor AOC L32W451
1.Remove the
screws marked in
red to remove the
main board,
power board and
tuner board.
Remove
power ,
tuner and
power
board,etc
2.Disconnect the
connector and
remove the tuner
board , power
board and main
board.
3. Remove the
screws and
connector to
remove the ir
board.
Remove
the plate
and the
bezel
Remove the
screws marked in
red to remove
plate and the
bezel.
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32’’ LCD TV Color Monitor AOC L32W451
Remove the
Remove
the frame
screws connect
with the panle to
remove frame.
The end
N/A
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32’’ LCD TV Color Monitor AOC L32W451
5. Repair Flow Chart
5.1 No Power (No LED indicator)
Check power cord and board interface
OK
Check F901, BD901, D901, D902
NG
OK
Check the load
Check IC981, D928 (12V)
NG
OK
Check Q924, IC924 (ON/OFF signal)
OK
Check IC941, Q941
NG
OK
Check T951
NG
OK
Check IC901, Q901
NG
OK
Check Q942, Q943
NG
OK
Check IC927
NG
NG
Replace F901 or BD901 or D910 or D902
Replace IC981or D928
NG
Replace IC941, Q941
Replace T951
Replace IC901 or Q901
Replace Q942 or Q943
Replace IC927
Plug in power cord and interface
Replace Q924 or IC924
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32’’ LCD TV Color Monitor AOC L32W451
5.2 Can not start (LED indicator yellow)
Check key board
NG
Repair the key board
OK
Check 5V_SB
NG
Return to “5.1”
OK
Check 3.3V_SB
OK
NG
Replace U701
Check Q704, Q705, Q706, Q709
NG
Replace Q704 or Q705
or Q706 or Q709
Check PWR_ON signal
NG
Check U32, U21
NG
Replace U32 or U21
OK
Check I2C communication
Check Panel inverter board
NG
Replace panel
Check PFC circuit
NG
Replace IC901 or Q901
OK
Check main board power supply
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32’’ LCD TV Color Monitor AOC L32W451
5.3 No display (LED indicator green)
Check the source
NG
Reset source
OK
Check LVDS cable
NG
Reset LVDS cable
OK
Check 24V power supply
NG
Return to “5.1”
OK
Check main board power supply
OK
Check U21
NG
Replace U21
OK
Check I2C communication
OK
Check panel
NG
Replace panel
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32’’ LCD TV Color Monitor AOC L32W451
5.4 Abnormal display
Check the source
NG
Reset source
OK
Check signal filter circuit
NG
Replace the filter or inductance
RF signal Check TV system setup
OK
OK
Check Tuner
NG
Replace Tuner
OK
AV, SCART1/2_CVBS signal
Check U3
NG
Replace U3
S-video SCART2_Y/C signal
OK
PC signal
Check U11
NG
Replace U11
Check U21, U20
NG
Replace U20
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32’’ LCD TV Color Monitor AOC L32W451
5.5 No sound
Check the source
Reset source
Check signal filter circuit
OK
NG
Replace the filter or inductance
Check Earphone jack
NG
Replace the Earphone jack
OK
SIF signal Check TV system setup
OK
Check Tuner
NG
Replace Tuner
AV, AIR1/AIR2, PC signal
Check Audio decoder MSP3410G U4
NG
Replace U4
OK
Check U63, U61
NG
Replace U63 or U61
OK
Check Amplifier MAX9714 U60
OK
Check speaker
NG
NG
Replace U60
Replace speaker
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