AOC L22DK99U, L26DK99U, L32DK99U Schematic

22″_26″_32″LCD TV AOC L22_26_32DK99U

Service

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………………...…….……….......6

2.1 The Use of Remote Control…….…..……….…….......6

2.2 To Use the Menu….....…………………….……….......7

2.3 How to Connect……..……………….…….……….....11

2.4 Front Panel Control Knobs…….………….……….....18

3. Input/Output Specification…………....................…....19

4. Mechanical Instructions…………………….................21

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

6. PCB Layout ………………..…………………....….......38

6.1 Main Board…………..………………...…….…….......38

SAFETY NOTICE

ANY PERSON ATTEMPTING TO SERVI CE THIS CHASSIS MUST FAMILIARIZE HIMSELF WITH THE CHASSIS

6.2 Power Board……..……………….…….……….......40

6.3 Inverter Board…..……………….…….……….......44

6.4 Key Board………………………..……..……….......46

6.5 IR Board………………………….……..……….......47

7. Adjustment……..………………………….................48

8. Block Diagram.……........................................ .........4 9

9. Schematic Diagram…..…………....………………...50

9.1 Main Board…………………………………...….......50

9.2 Power Board…..………….….……...………….......68

9.3 Inverter Board.…...……….….……...………….......71

9.4 Key Board……………….……….…………….........74

9.5 IR Board……...………….……….…………….........75

10. Exploded View………………………………….…...77

11. BOM List……………….………………….………….78

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 servi ce procedures recommended by AOC and described in this service manual are effective methods of performin g 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 CAUTIO NS 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 ba cklight 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 ground ed 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 sof t material. (Cleaning with a dirty or roug h cloth may damage the panel.)

Revision List

Version Release Date Revision Instructions TPV Model

A00 Apr.11,2010 Initial Release E22A22QNCWGA1NNS

A00 Apr.11,2010 Initial Release E26A22QNCWGA1NNS

A00 Apr.11,2010 Initial Release E32A22QNCWGA1NNS

1. General Specification

Computer formats

Video formats

2. Operating Instructions

2.1 The Use of Remote Control

2.2 To Use the Menus

1. Press the MENU/EXIT button to display or close the main menu.

2. Use the “ Screen Display) menu. Press the MENU/EXIT button to enter the main OSD. Adjust the items including Picture Setting, Audio Setting, Feature Setting, Installation Setting. However, some function items in the menus may only be enabled in the

particular source modes.

Picture Setting

The Picture Settingin TV mode shows as below.

”, “v”, “﹤”, “﹥” and “ENTER” to move around to select, adjust or confirm an item in the OSD (On

Audio Setting

The Audio Setting in most source modes shows as below.

Feature Setting

The Feature Setting in TV mode shows as below.

Installation Setting

The Installation Setting in TV mode shows as below.

2.3 How to Connect

Using Your Antenna or Cable for TV

Note: It is strongly recommended that you connect the antenna/cable input using a 75-ohm coaxial cable to receive optimum picture quality.

1. Turn off the TV.

2. Connect the coaxial (RF) connector from your antenna or cable (out-of-the-wall, not from the Cable Box) to the ANTENNA connector at the rear of the TV

3. Turn on the TV.

4. Select TV using the SOURCE button on the Remote control or the INPUT keypad on the side of the TV, or pressing the TV button on the Remote Control.

5. Connect the AV OUT and AV IN of the other TV, the signal will display on the other TV.

Using the Antenna or Cable for your VCR

1. Turn off the TV.

2. Connect the “Output to TV”, “RF Out” or “Antenna Out” connector on the rear of your VCR to the ANTENNA connector at the rear of the TV.

3. Turn on the TV.

4. Select TV using the SOURCE button on the Remote control or the INPUT keypad on the side of the TV or directly by pressing the TV button on the Remote Control.

5. Connect the AV OUT and AV IN of the other TV, the signal will display on the other TV.

Connecting Your TV Set-Top Box Using HDMI

TV Set-Top Boxes that have a HDMI digital interface should be connected to the HDMI input of the LCD TV for optimal results.

Using Component Video Connecting your TV Set-Top Box (Better):

1. Turn off the TV and TV Set-Top Box.

2. Connect the Pr (red color) connector on your TV Set-Top Box to the correspo nding P r (red colo r) conne ctor in th e Component group.

3. Connect the Pb (blue color) connector on your TV Set-Top Box to the corresponding Pb (blue color) connector in the Component group.

4. Connect the Y (green color) connector on your TV Set-Top Box to the corresponding Y (green color) connector in the Component group.

5. Using an audio cable (red and white connectors), connect the cable to the audio output connectors associated with the Component output on your TV Set-Top Box and connect the other end to the audio connectors associated with the Component.

6. Turn on the TV and TV Set-Top Box.

7. Select YPbPr using the SOURCE button on the Remote control or the INPUT keypad on the side of the TV or directly by pressing the COMP button on the Remote Control.

NOTE

Refer to your TV Set-Top Box user manual for more information about the video output requirements of the product or consult your cable or satellite operator.

Connecting Your Basic Set-Top Box Using Composite Video

1. Turn off the TV and Set-Top Box.

2. Using an AV Cable, connect the Video (yellow color) connector on your Set-Top Box to the corresponding Video (yellow color) connector in the AV group at the rear of the TV.

3. Using the red and white connectors, connect the cable to the audio output connectors associated with the Video output on your Set-Top Box and connect the other end to the audio connectors associated with the AV input at the rear of the TV.

4. Turn on the TV and Set-Top Box.

5. Select AV-1 using the SOURCE button on the Remote control or the INPUT keypad on the side of the TV or directly by pressing the VIDEO button on the Remote Control.

Using Coax (RF)

1. Turn off the TV.

2. Using a Coax (RF) cable, connect one end to the TV.

3. Turn on the TV.

4. Select TV using the SOURCE button on the Remote control or the INPUT keypad on the side of the TV or directly by pressing the TV button on the Remote Control.

Connecting Your DVD Player Using HDMI

DVD players that have a digital interface such as HDMI (High Definition Multimedia Interface) should be connected to the HDMI input of the LCD TV for optimal results.

Connecting your DVD Player (Best)

1. Turn off the TV and DVD player.

2. Connect a HDMI cable to the HDMI output of your DVD player and the other end to the HDMI Input at the rear of the TV.

3. Turn on the TV and DVD player.

4. Select HDMI using the SOURCE button on the Remote control or the INPUT keypad on the side of the TV or directly by pressing the HDMI/PC button on the Remote Control.

For DVD Players with DVI:

1. Turn off the TV and DVD player.

2. Using a HDMI-DVI cable, connect the DVI end to your DVD player and the HDMI end to the HDMI Input at the rear of the TV.

3. Turn on the TV and your DVD player.

4. Select HDMI using the SOURCE button on the Remote control or the INPUT keypad on the side of the TV, or directly by pressing the HDMI/PC button on the Remote.

NOTE

Refer to your DVD player user manual for more information about the video output requirements of the product. The DVI to HDMI connection provides video only. Connection to an alternate audio player is required for audio output.

Using Component Video Connecting your DVD Player (Better)

1. Turn off the TV and DVD player.

2. Connect the Pr (red color) connector on your DVD player to the corresponding Pr (red color) connector in the Component at the rear of the TV.

3. Connect the Pb (blue color) connector on your DVD player to the corresponding Pb (blue color) conne ctor in the Component group at the rear of the TV.

4. Connect the Y (green color) connector on your DVD player to the corresponding Y (green color) connector in the Component group at the rear of the TV.

5. Using an audio cable (red and white connectors), connect the cable to the audio output connectors associated with the Component output on your DVD player and connect the other end to the audio connectors associated with the Component input at the rear of the TV.

6. Turn on the TV and DVD player.

7. Select Component using the SOURCE button on the Remote control or the INPUT keypad on the side of the TV or directly by pressing the COMP button on the Remote Control.

NOTE

Refer to your DVD player user manual for more information about the video output requirements of the product.

Using S-Video (AV-2) Connecting your DVD Player (Good):

1. Turn off the TV and DVD player.

2. Connect the S-Video jack on the rear of your DVD player to the S-Video jack in the AV group on the rear of the TV.

3. Connect an audio cable (white and red connectors) to the audio output connectors associated with the S-Video output on your DVD player and connect the other end to the audio connectors associated with the AV input on the rear of the TV.

4. Turn on the TV and DVD player.

5. Select AV-2 using the SOURCE button on the Remote control or the INPUT keypad on the side of the TV, or directly by pressing the VIDEO button on the Remote Control.

Using Composite (AV) Video Connecting your DVD Player (Good)

1. Turn off the TV and DVD player.

2. Connect the Video (yellow color) connector on your DVD player to the Video (yellow color) connector in the AV group.

3. Connect the R (red color) and L (white color) audio connectors on your DVD player to the corresponding R (red color) and L (white color) audio input connectors in the AV group.

4. Turn on the TV and DVD Player.

5. Select AV using the SOURCE button on the Remote control or the INPUT keypad on the side of the TV or directly by pressing the VIDEO button on the Remote Control.

Connecting Your VCR or Video Camera

1. Turn off the TV and VCR or Video Camera.

2. Connect the S-Video jack on the rear of your VCR or Video Camera to the S-Video jack in the AV group on the rear of the TV.

3. Connect an audio cable (white and red connectors) cable to the audio output connectors associated with the S-Video output on your VCR or Video Camera and connect the other end to the audio connectors associated with the AV input on the rear of the TV.

4. Turn on the TV and VCR or Video Camera.

5. Select AV-2 using the SOURCE button on the Remote control or the INPUT keypad on the side of the TV or directly by pressing the VIDEO button on the Remote Control.

NOTE

Refer to your VCR or Video Camera user manual for more information about the video output requirements of the product.

Connecting to a PC

1. Turn off the TV and PC.

2. Connect a 15-pin D-Sub RGB (VGA) cable to the RGB output of your PC and the other end to the VGA input at the rear of the TV.

3. Connect the Audio Out on your computer to the AUDIO input at the rear of the TV.

4. Turn on the TV and PC.

5. Select VGA using the SOURCE button on the Remote control or the INPUT keypad on the side of the TV or directly by pressing the HDMI/PC button on the Remote.

NOTE

For the best picture quality when connecting a computer through VGA, set your computer timing mode to native resolution of panel. Please refer to the PC or graphic card’s user guide for additional information on how to set the timing mode and the video output requirements of the product.

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 Reserved (N.C. on Device) 15 SCL 16 SDA 17 DDC/CEC Ground 18 +5V Power 19 Hot Plug Detect

3.3 AV/S-Video/Component Video Inputs

AV (Composite Video Input) Video1

Amplitude 1Vpp (300mV-sync, 700mV-video) Impedance 75 ohm terminated

S-Video (Y / C Input) S-Video2

System PAL/ SECAM Y signal amplitude 1VppY-signal C signal amplitude +/-300mV C-signal Impedance 75 ohm terminated

Component (Y, Pb/Cb, Pr/Cr Input)

Video3

System PAL/ SECAM

4. Mechanical Instructions

1. Remove the four screws to remove the stand base .

2. Remove twelve screws to remove the rear cover.

3. Remove six screws and unplug four connectors to remove the main board.

4. Remove five screws and unplug three connectors to remove the power board.

5. Remove five screws and unplug seven connectors to remove the inverter board.

6. Remove twelve screws to remove the bracket.

7. Remove four screws to remove two speakers.

8.Remove the screw to remove the IR board.

9. Remove the four screws to remove the front bezel.

7. Remove the connector to remove Key Board.

10.The panel

5. Repair Flow Chart

1. No power(for 22”)

No power (LED “Off”)

Check the AC input and the

ower is “ON”?

Yes

Power board output=5V?

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 (for 22”)

No power (LED “Off”)

Check the AC input and

ower is “ON”?

the

Yes

Power board output=5V?

Yes

Check the IR board and LED

Replace the IR board

Replace the main board

Power “On”

Replace the power board

3. No display (for 22”)

No display (LED green)

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

Vcc =5V?

Yes

Replace the Panel

Replace the main board

Power board output＝16V?

Yes

Replace the Panel

Replace the power board

4. Sound problem (for 22”)

No display (LED green)

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. Remote control malfunction (for 22”)

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

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