AOC LE22H158 Schematic

21.5″ LCD TV AOC LE22H158

Service

31~67 KHz

TABLE OF CONTENTS

Description Page Description Page

Table of Contents.......……....................................…........1

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

Revision List…………………………………………………3

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

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

3. Input/Output Specification…………......................…....6

4. Mechanical Instructions……………………...................8

5. Repair Flow Chart ……………………….…….…….....11

6. PCB Layout ………………..…………………....….......18

6.1 Main Board……………..……………...…….…….......18

6.2 Power Board……...……………..….…….……….......22

6.3 LED Board……...…………...……..……..……….......25

SAFETY NOTICE

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

6.4 Key Board…………….………….……..……….......25

6.5 IR Board………………………….……..……….......25

7. Adjustment..............................................................26

8. Block Diagram.…….................................................27

9. Schematic Diagram…..…………....………………...28

9.1 Main Board…………………………………...….......28

9.2 Power Board…………..….….……...………….......48

9.3 LED Board…...………….……….…………….........50

9.4 Key Board……………….……….…………….........51

9.5 IR Board……...………….……….…………….........52

10. Exploded View………………………………….…...53

11. BOM List……………….………………….………….55

Horizontal Frequency

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

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.)

Revision List

Version Release Date Revision Instructions TPV Model

A00 Oct.17,2011 Initial release E2ABATNSAEB16NX

1. General Specification

Please refer to user manual.

2. Operating Instructions

Please refer to user manual.

3. Input/Output Specification

3.1 RGB Signal Input

15 - Pin Color Display Signal Cable

Pin No. Description Pin No. Description

1 Red Video 9 No Pin

2 Green Video 10 Sync Ground

3 Blue Video 11 RXD

4 TXD 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

3.2 HDMI Digital Connector Pin Assignments

Pin No. Description Pin No. Description

1 TMDS Data2+ 2 TMDS Data2 Shield

3 TMDS Data2- 4 TMDS Data1+

5 TMDS Data1 Shield 6 TMDS Data1-

7 TMDS Data0+ 8 TMDS Data0 Shield

9 TMDS Data0- 10 TMDS Clock+

11 TMDS Clock Shield 12 TMDS Clock-

13 CEC 14 NC

15 SCL 16 SDA

17 DDC/CEC Ground 18 +5V Power

19 Hot Plug Detect

3.3 Compatible Mode Table

Analog RGB Input Signal

VESA MODES

Horizontal Vertical

Nominal

Mode Resolution

640x480@60Hz (T167) 31.469 N 59.940 N 25.175

VGA

SVGA

XGA

WXGA

WSXGA 1440x900@60Hz 55.935 N 59.887 P 106.5

1680x1050@60Hz 64.674 P 59.883 N 119

FHD 1920x1080@60Hz 66.587 P 59.934 N 138.500

640x480@72Hz (T198) 37.861 N 72.809 N 31.500 640x480@75Hz (T117) 37.5 N 75 N 31.500 720x400@70Hz (T219) 31.469 N 70.087 P 28.322 800x600@56Hz (T215) 35.156 P 56.25 P 36.000 800x600@60Hz (T126) 37.879 P 60.317 P 40.000 800x600@72Hz (T128) 48.077 P 72.188 P 50.000

800x600@75Hz (T154) 46.875 P 75 P 49.5 1024x768@60Hz (T137) 48.363 N 60.004 N 65.000 1024x768@70Hz (T138) 56.476 N 70.069 N 75.000 1024x768@75Hz (T139) 60.023 P 75.029 P 78.750 1280x720@60Hz (T281) 45 P 60 P 74.25 1280x768@60Hz (T147) 47.396 P 59.995 N 68.25

1280x1024@60Hz (T144) 63.981 P 60.02 P 108.000

Frequency

(KHz)

Sync

Polarity

Nominal

Freq.

(Hz)

Sync

Polarity

HDMI Input Signal

VESA MODES

Horizontal Vertical

Nominal

Mode Resolution Total

1080P 1920X1080P 2200 x 1125 67.5 60 148.50 1080P 1920X1080P 2200 x 1125 24 59.4

720P 1280×720P 1650 x 750 45.00 60 74.25

1080i 1920X1080i 2200 x 1125 33.75 60 74.25

480P 720X480P 858 x 525 31.50 60 27.03

480i 720X480i 1716 x 525 15.75 60 27.03

Frequency

(KHz)

Sync

Polarity

Nominal

Freq.

(Hz)

Sync

Polarit

Nominal

Pixel

Clock

(MHz)

Nominal

Pixel

Clock

(MHz)

4. Mechanical Instructions

1. Remove the screws to remove REAR COVER and BASE.

2. Remove the screws to remove AC COVER, LED BOARD and SPEAKERS.

3. Remove the screws to remove MAIN BOARD and POWER BOARD.

4. Remove the screws to remove BKT and separate the PANEL and BEZEL.

5. Remove the screws to remove IR BOARD and KEY BOARD.

5. Repair Flow Chart

1. No power

No power (LED “Off”)

Check the AC input and the

ower is “ON”?

Yes

Power board

out

ut=5.2V?

Yes

Check the IR board and LED

Replace the IR board

Replace the main board

Power “On”

Replace the power board

2. Can’t start

Can’t start（LED orange）

Power board output＝16V?

Yes

Check the power key is under control?

Check the IR receiver is normal?

Replace the power board

Yes

Replace the key board

Yes

Replace the IR board

Replace the main board

Replace the Power board

3. Abnormal display

Abnormal Display

Check the source

Yes

Enter factory mode to do

“EEPROM initial”&“Reset”

Reset the source

Check the main board

Yes

Check the LVDS cable

Yes

Check the panel

Replace the panel

Replace the main board

Replace the LVDS cable

4. No display

No display (LED blue)

Check TV is under control and power on/off by remote control and power key?

Yes

Check the LVDS cable

Yes

Check the backlight is

“On”?

Reinsert or replace the LVDS cable

Check the B/L

signal is available?

Yes

Replace the main board

Replace main board

Panel Vcc = 5V?

Yes

Replace the Panel

Replace the main board

Power board output＝16V?

Yes

Replace the Panel

Replace the power board

5. Sound problem

No sound or sound abnormal

Check the audio source connection

and the TV system are correct?

Yes

Check the TV is muted, adjust the

volume or enter the menu to reset?

Reinsert the audio cable or change the TV system

Enter factory mode to do “Reset”

Check the cable between the speakers and main board is OK?

Yes

Check the speaker resistance value is in spec (Remark: The value is marked on the speaker)?

Yes

Replace the cable

Replace the main board

Replace the speaker

6. Remote control malfunction

Remote Control malfunction

Check the remote control battery is not properly placed or no power?

Use the other remote controls

Whether the IR board is

abnormal?

Replace the main board

Yes

Replace the battery

Yes

Replace the remote control

Yes

Replace the IR board

7. OSD is unstable or can’t work normally

OSD is unstable or can’t work normally

Key board connected properly?

Yes

Buttons are OK?

Yes

Key board is OK?

Yes

Enter factory mode to do “Reset”

Reconnect the key board

Replace the button function

Replace the key board

Replace the main board

6. PCB Layout

6.1 Main Board

715G4786M0H000005K

19 20 21

6.2 Power Board

715G4485P02000002S

23 24

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