AOC H428PW Schematic

42’’ Flat Wide Monitor AOC H428Pw

Service

Description Page Description Page

Table Of Contents.......……..............................…........1

Important Safety Notice.......................................……......2

Revision List…………........................................……......3

1. General Specification….............................………........4

2. Operating Instructions…...………………….……….......5

2.1.Front Buttons and Connections…….………….….....5

2.2.OSD Function……..…...…………………….………...7

3. Input/Output Specification…………....................…....11

4. Mechanical Instructions…………………….................12

5. Repair Flow Chart ……………………….…….…….....15

6 PCB Layout ………………..………………....….......17

6.1.Main Board…………..…………..……….……….......17

Table Of Contents

6.2.Power Board……..…………..………….……….......20

6.3. Key Board…..…………………………….……….......23

6.4.IR Board…………..………………..……….......23

7.Adjustment………..…………………........................24

8. Block Diagram.………….............................................25

9. Schematic………………....…….……..………………..26

9.1 Main Board…….……………..….…………….….......26

9.2. Power Board………………….……….………….......36

9.3.Key Board……….……….……….………….......38

9.4. Tuner Board…………..….…….…….………….........39

10. Exploded View..………………...........................…..40

11. BOM list.………….........................…..……………….41

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

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42’’ Flat Wide Monitor AOC H428Pw Important Safety Notice

Proper service and repair is important to the safe, reliable operation of all AOC Company Equipment. The service

procedures recommended by AOC and described in this service manual are effective methods of performing service

operations. Some of these service operations require the use of tools specially designed for the purpose. The

special tools should be used when and as recommended.

It is important to note that this manual contains various CAUTIONS and NOTICES which should be carefully read in

order to minimize the risk of personal injury to service personnel. The possibility exists that improper service

methods may damage the equipment. It is also important to understand that these CAUTIONS and NOTICES ARE

NOT EXHAUSTIVE. AOC could not possibly know, evaluate and advise the service trade of all conceivable ways in

which service might be done or of the possible hazardous consequences of each way. Consequently, AOC has not

undertaken any such broad evaluation. Accordingly, a servicer who uses a service procedure or tool which is not

recommended by AOC must first satisfy himself thoroughly that neither his safety nor the safe operation of the

equipment will be jeopardized by the service method selected.

Hereafter throughout this manual, AOC Company will be referred to as AOC.

WARNING

Use of substitute replacement parts, which do not have the same, specified safety characteristics might create

shock, fire, or other hazards.

Under no circumstances should the original design be modified or altered without written permission from AOC.

AOC assumes no liability, express or implied, arising out of any unauthorized modification of design.

Servicer assumes all liability.

FOR PRODUCTS CONTAINING LASER:

DANGER-Invisible laser radiations when open AVOID DIRECT EXPOSURE TO BEAM.

CAUTION-Use of controls or adjustments or performance of procedures other than those specified herein may

result in hazardous radiation exposure.

CAUTION -The use of optical instruments with this product will increase eye hazard.

TO ENSURE THE CONTINUED RELIABILITY OF THIS PRODUCT, USE ONLY ORIGINAL MANUFACTURER'S

REPLACEMENT PARTS, WHICH ARE LISTED WITH THEIR PART NUMBERS IN THE PARTS LIST SECTION OF

THIS SERVICE MANUAL.

Take care during handling the LCD module with backlight unit

-Must mount the module using mounting holes arranged in four corners.

-Do not press on the panel, edge of the frame strongly or electric shock as this will result in damage to the screen.

-Do not scratch or press on the panel with any sharp objects, such as pencil or pen as this may result in damage to

the panel.

-Protect the module from the ESD as it may damage the electronic circuit (C-MOS).

-Make certain that treatment person’s body is grounded through wristband.

-Do not leave the module in high temperature and in areas of high humidity for a long time.

-Avoid contact with water as it may a short circuit within the module.

-If the surface of panel becomes dirty, please wipe it off with a soft material. (Cleaning with a dirty or rough cloth may

damage the panel.)

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42’’ Flat Wide Monitor AOC H428Pw

Revision List

Version Release Date Revision Instructions TPV Model

A00 Aug.-27-2008 Initial Release J42RMNNSW1A4NN

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42’’ Flat Wide Monitor AOC H428Pw

1. General Specification

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42’’ Flat Wide Monitor AOC H428Pw

2. Operating Instructions

2.1 Front Buttons and Connections

2.1.1 Front Buttons

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42’’ Flat Wide Monitor AOC H428Pw

2.1.2 Connections

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42’’ Flat Wide Monitor AOC H428Pw

2.2 OSD Function

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42’’ Flat Wide Monitor AOC H428Pw

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42’’ Flat Wide Monitor AOC H428Pw

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42’’ Flat Wide Monitor AOC H428Pw

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42’’ Flat Wide Monitor AOC H428Pw

3. Input/Output Specification

3.1 Connectors

AC Power : Monitor rear side

Analog RGB : Monitor rear side / Data Cable : 15-pin D-sub female

Pin – Assignment of 15-pin D-sub:

1 Red Video 9 5V

2 Green Video 10 Sync Ground

3 Blue Video 11 Not Used

4 Not Used 12 Serial Data for DDC

5 Ground 13 H-Sync.

6 Red Ground 14 V-Sync.

7 Green Ground 15 Serial Clock for DDC

8 Blue Ground

S-Video (Y/C) : Monitor rear side : 4 Pin Mini-DIN female

Composite Video : Monitor rear side : RCA female

Component video : Monitor rear side : RCA female

Audio : Monitor rear side : RCA female (Red/White)

(right channel/left channel )

3.2 Factory Preset Timing table

Vertical Horizontal Dot Sync Polarity Presence Screen Mode

Dots × Lines

720 ×400 70.1 31.5 28.322 NEG POS YES YES YES YES

640 ×480

800x 600

1024x768 60.0 48.363 80.000 NEG NEG YES YES YES YES

1360x768 59.79 47.72 84.75 NEG POS YES YES YES YES

1440x900(R) 59.978 65.317 106.5 POS NEG YES YES YES YES

1280x768 59.870 47.776 79.500 NEG POS YES YES YES YES

1280x1024 60.020 63.981 108.000 POS POS YES YES YES YES

1680X1050 59.884 64.674 119.000 POS POS YES YES YES YES

Frequency Frequency

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

59.9 31.5 25.175 NEG NEG YES YES YES YES

72.8 37.9 31.500 NEG NEG YES YES YES YES

75.0 37.5 31.500 NEG NEG YES YES YES YES

60.0 37.9 40.000 POS POS YES YES YES YES

72.2 48.1 50.000 POS POS YES YES YES YES

75.0 46.87 49.500 POS POS YES YES YES YES

clock

Horizontal Vertical Horizontal Vertical Normal FULL

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42’’ Flat Wide Monitor AOC H428Pw

4. Mechanical Instructions

1. Prepare: put the monitor on a soft,clean and flat surface as figure 1.

Figure 1

2. Remove the base as figure 2.

3. Remove the rear cover as figure 3.

Figure 2

Figure 3

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42’’ Flat Wide Monitor AOC H428Pw

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42’’ Flat Wide Monitor AOC H428Pw

4. Remove the main board,power board and AC socket as figure 4.

Figure 4

5. The end.

Figure 5

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42’’ Flat Wide Monitor AOC H428Pw

5. Repair Flow Chart

5.1 No Power

No LED

Check the 5V power supply

Check the 300V voltage

Check IC931 power supply

5.2 No picture（LED green）

Check key board

NG

OK

NG

Replace relevant component

NG

Check F901,NR901,C905

NG

Check Q931,T931,D931,D933

Check key board and remote control

No picture

OK

NG

Replace key board and remote control

Check the power supply circuit

OK

Check U403(MCU)

NG

Replace U403

OK

Check I2C

NG

Replace I2C component

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42’’ Flat Wide Monitor AOC H428Pw

t

5.3 No Display（LED green）

Check the backlight

NG NG

OK

Check LVDS connector

and LVDS cable

Check 24V power supply

OK

Check PS signal

NG

OK

Check power board

OK

Check U403

OK

NG

Check U401

5.4 Abnormal Picture

Check signal source

Check signal-filter circuit

OK

NG

Replace U403

Replace U401

OK

Check Panel

NG

Check BL-ON/OFF signal

NG

Check Q705、Q704

NG

Replace Panel

Reset the signal source or signal cable

Replace filer capacity of inductance

NG

Replace Q705、Q704

OK

AV/SV

Check the interface to U401 circui

PC signal

OK

Check U401

OK

Check panel

HDMI SIGNAL

NG

Replace U401

Replace panel

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Check U507

NG

Replace the revelant component

Replace U507

42’’ Flat Wide Monitor AOC H428Pw

6. PCB Layout

6.1 Main Board

715T2968-1

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42’’ Flat Wide Monitor AOC H428Pw

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42’’ Flat Wide Monitor AOC H428Pw

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42’’ Flat Wide Monitor AOC H428Pw

6.2 Power Board

715T2802 1

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