AOC T954we, T2254we Service manual

18.5″ & 21.5″ LCD TV AOC T954we-T2254we

Service

31~60 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

2.1 The Use of Remote Control…….…..……….…….......5

2.2 To Use the Menus….....………………….…..…….......6

2.3 How to Connect……..……………….…….……….....14

2.4 Front Panel Control Knobs…….………….……….....16

3. Input / Output Specification………....................…....18

4. Mechanical Instructions…………………….................20

5. Repair Flow Chart ……………………….…….…….....26

SAFETY NOTICE

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

6. PCB Layout ………………..………………....….......33

6.1 Main Board…………..……………...…….…….......33

6.2 Power Board……...…………..….…….……….......35

6.3 IR Board…...…………………………………….......36

7. Adjustment..............................................................37

8. Block Diagram.…….................................................38

9. Schematic Diagram…..…………....………………...40

9.1 Main Board…………………………………...….......40

9.2 Power Board…………..….….……...………….......51

9.3 IR Board…...…………….……….…………….........53

10. Exploded View………………………………….…...54

11. BOM List……………….………………….………….57

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 Customer Model TPV Model

T954we E1BBMKNSBVB13N

A00 Apr.24,2012 Initial release

T2254we E2ABMKNSBVB13N

1. General Specification

Note:

• Designs and specifications are subject to change without notice.

• This model may not be compatible with features and/or specifications that may be added in the future.

2. Operating Instructions

2.1 The Use of Remote Control

2.2 To Use the Menus

2.3 How to Connect

Connecting TV

2.4 Front Panel Control Knobs

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 Clock13 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 Timing

HDMI Input Signal Timing

4. Mechanical Instructions

T954we

1. Remove the screws to remove STAND and BASE.

2. Remove the screws to remove REAR COVER.

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

4. Remove the screw to remove the BKT and separate the Panel and Bezel.

5. Remove the screw to remove IR BOARD.

T2254we

1. Remove the screws to remove STAND and BASE.

2. Remove the screws to remove REAR COVER.

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

4. Remove the screws to remove the BKT and separate the Panel and Bezel.

5. Remove the screw to remove IR 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 red)

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 (No LED)

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 = 3.3V?

Yes

Replace the Panel

Replace the main board

Power board output＝16V?

Yes

Replace the Panel

Replace the power board

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