AOC L32W451B TV Repair Guide Service Manual

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Service Service Service

Horizontal Frequency 31.5KHz- 48KHz

TABLE OF CONTENTS

Description Page Description Page

SAFETY NOTICE ANY PERSON ATTEMPTING TO SERVICE THIS CHASSIS MUST FAMILIARIZE HIMSELF WITH THE

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

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. Schemat ic D iagram.. .48

9.1 Ma in Board....48

9.2 Power Board........................................60

9.3 Tuner Board..........................................62

9.4 Earphone Board..65

10. BOM List......................................................66

11. Different Parts List.92

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

7.1 Main Board........................................36

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Revision List

Version Release Date Revision Instructions TPV Model

A00 Oct.-11-2006 Initial Release E325MTNBC3A3NP

A01 Oct-20-2006 Second Release E325MTNBC3A22P E326MTNBC3AC2P

A02 May.-04-2007 Third Release E325MTNCC3A3NP

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1. Monitor Specifications

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2. Operations Instructions 2.1 The Use Of Remote Control

2.2 The Use Of Teletext

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2.3 Front Panel Control Knobs

2.4 OSD Operations

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2.5 How to Connect

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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 power 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 system device and lock both screws on the connector to ensure firm grounding. The connector information is as follow:

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11 15

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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 for 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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3.2 RGB Input Signal Timing

Horizontal Vertical Sync Polarity Presence Screen Mode

Frequency Frequency Horizontal Vertical Horizonta Vertical Normal FULLDots Lines

(kHz) (Hz) (4:3) (16:9)

720400 31.47 70.08 NEG POS YES YES YES YES

640480 31.50 60.00 NEG NEG YES YES YES YES

640480 37.50 75.00 NEG NEG YES YES YES YES

640480 37.86 72.81 NEG NEG YES YES YES YES

800600 37.90 60.32 NEG NEG YES YES YES YES

800600 46.90 75.00 NEG NEG YES YES YES YES

800600 48.08 72.19 NEG NEG YES YES YES YES

1024768 48.40 60.00 YES YES YES YES YES YES

1280768 47.7 60 YES YES YES YES YES YES

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4. Mechanical Instructions Step Figure Description

Preparation

Lay the LCD-TV on a flat, soft and clean surface.

Remove the base

Remove the hinge cover

Remove the stand

Remove the screws on the stand to remove the stand.

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Remove the back cover

Remove the 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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Remove power , tuner and power board,etc

1.Remove the screws marked in red to remove the main board, power board and tuner board. 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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Remove the frame

Remove the screws connect with the panle to remove frame.

The end

N/A

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5. Repair Flow Chart 5.1 No Power (No LED indicator)

NG Check power cord and board interface Plug in power cord and interface

OK

Check F901, BD901, D901, D902 NG Replace F901 or BD901 or D910 or D902

OK

Check IC981, D928 (12V)

Check IC901, Q901

NGReplace IC981or D928

Check Q924, IC924 (ON/OFF signal) NG

Replace Q924 or IC924

OK

OK

Check T951

OK

NG

Replace T951

Replace IC901 or Q901

OK

Check Q942, Q943

Check IC941, Q941 Replace IC941, Q941

OK

NG

NG

NG Replace Q942 or Q943

Ch