AOC LE23H037 Schematic

23″LCD TV AOC LE23H037

Service

31.5~68 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……..……………….…….……….....12

2.4 Front Panel Control Knobs…….………….……….....14

3. Input/Output Specification…………....................…....16

4. Mechanical Instructions…………………….................18

5. Repair Flow Chart ……………………….…….…….....21

6. PCB Layout ………………..…………………....….......28

6.1 Main Board…………..………………...…….…….......28

SAFETY NOTICE

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

6.2 Power Board………………..…….…….……….......30

6.3 LED Board……...…………..…….…….……….......33

6.4 Key Board………………………..……..……….......33

6.5 IR Board………………………….……..……….......33

7. Adjustment……..………………………….................34

8. Block Diagram.…….................................................35

9. Schematic Diagram…..…………....………………...37

9.1 Main Board…………………………………...….......37

9.2 Power Board…………..….….……...………….......46

9.3 LED Board………….……..….……...………….......48

9.4 Key Board……………….……….…………….........49

9.5 IR Board……...………….……….…………….........50

10. Exploded View………………………………….…...51

11. BOM List……………….………………….………….53

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 Aug.24,2010 Initial Release E23ASANSWEB13N

1. General Specification

Modelo Tamanho da Tela Resolução

Sistema da TV

Cobertura de Canais

Alto-falantes Impedância da Antena Fonte de Energia Consumo de energia em espera Terminais de Vídeo/Áudio

Entrada S-Vídeo

Entrada Vídeo/Áudio

Saída Vídeo/Áudio

Entrada Componente

Terminais HDMI

Terminais VGA

Fone de Ouvido Tamanho (L x A x P)

(com base)(mm) Peso

Tamanho do Suporte de Parede Acessórios do Suporte de Parede

Equipamento: Temperatura de Operação Temperatura de Armazenamento

LE23H037 598mm (23”) 1920 x 1080 Padrão NTSC PAL-M & PAL-N

VHF: 2 até 13 UHF: 14 até 69 Cable TV: 1 até 125

3W x 2 75 ohm 100-240V ~ 50/60Hz, 2.0A <1W Lateral AV x1: S-Vídeo/Vídeo/Áudio Saída Entrada/Áudio.

Y: 1 V(p-p), 75 ohm, sinc negativo. C: 0.286 V(p-p) (sinal de pico), 75 ohm

VÍDEO: 1 V(p-p), 75 ohm, sinc. negativo ÁUDIO: 500mv (rms)

Componente Traseiro x1: Y: 1V(p-p), 75 ohm, incluindo sinc. Pr/Cr: ±0.35V(p-p), 75 ohm Pb/Cb: ±0.35V(p-p), 75 ohm ÁUDIO: 500mv (rms)

HDMI INPUT: HDMI Traseiro x1; HDCP - em conformidade E-EDID - em conformidade

ENTRADA VGA: Traseira VGA (D-SUB 15 Pin) Entrada x1 E-EDID - em conformidade Entrada de Áudio: Plugue estéreo (3.5ø) Saída de Áudio: Plugue estéreo (3.5 ø)

579.2 x 419.7 x 160

4.1kg(com base) / 3.8Kg(sem base) 100 x 100 mm (Suporte de Parede não incluso) Acessórios opcionais não inclusos na embalagem padrão

35 oC para climas moderados (Temperatura máxima ambiente)

-20 oC~50 oC

2. Operating Instructions

2.1 The Use of Remote Control

2.2 To Use the Menus

10 11

2.3 How to Connect

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 Video Ground 14 V-Sync. 7 Green Video Ground 15 Serial Clock for DDC 8 Blue Video 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 Compatible Mode Table

Vertical

Dots x Lines

720x400 70.1 31.5 NEG POS YES YES YES YES 640x480 59.9 31.5 NEG NEG YES YES YES YES

800x600 60.0 37.9 POS POS YES YES YES YES 1024x768 60.0 48.363 NEG NEG YES YES YES YES 1360x768 59.79 47.72 NEG POS YES YES YES YES 1440x900 60 55.93 NEG POS YES YES YES YES

1680x1050 60 65.29 NEG POS YES YES YES YES 1920x1080 60 67.50 NEG POS YES YES YES YES

Frequency

(Hz)

Horizontal

Frequency

(kHz)

Sync Polarity Presence Screen Mode

Horizontal Vertical HorizontalVertical

Normal

(4:3)

FULL (16:9)

4. Mechanical Instructions

1. Remove the screws to remove the stand, base and rear cover.

2. Remove the screws to remove AC cover and bracket.

3. Remove the screws to remove main board and power board.

4. Remove the screws to remove key board, IR board, speakers and separate bezel and mainframe.

5. Remove the screws to separate mainframe and panel.

6. The panel.

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

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