AOC LE40H137M User Manual

40″ LCD TV AOC LE40H137M
1
Service
Service
Service
Horizontal Frequency
31~67 KHz
TABLE OF CONTENTS
Description Page Description Page
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
6.2 Power Board……...…………..….…….……….......39
6.3 Key Board………………………..……..……….......42
6.4 IR Board………………………….……..……….......42
7. Adjustment..............................................................43
7.1 ADC Adjustment……………………..……...………43
7.2 FW Upgrade.………………………………...………44
8. Block Diagram.…….................................................46
9. Schematic Diagram…..…………....………………...48
9.1 Main Board…………………………………...….......48
9.2 Power Board…………..….….……...………….......60
9.3 Key Board……………….……….…………….........66
9.4 IR Board……...………….……….…………….........67
10. Exploded View………………………………….…...68
11. BOM List……………….………………….………….70
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….....………………….…..…….......7
2.3 How to Connect……..……………….…….……….....22
2.4 Front Panel Control Knobs…….………….……….....24
3. Input/Output Specification…………....................…....25
4. Mechanical Instructions…………………….................27
5. Repair Flow Chart ……………………….…….…….....30
6. PCB Layout ………………..…………………....….......37
6.1 Main Board……………..……………...…….…….......37

AOC LE40H137M Specifications

General

Brand	AOC
Model	LE40H137M
Category	LCD TV
Language	English

Summary

Important Safety Notice

WARNING

Safety warning for using substitute replacement parts.

FOR PRODUCTS CONTAINING LASER:

Laser safety precautions when operating products containing lasers.

Revision List

1. General Specification

2. Operating Instructions

2.1 The Use of Remote Control

Explains the functions of each button on the remote control.

2.2 To Use the Menus

Instructions on how to turn the TV on and off using the remote or TV buttons.

Language Setting

Step-by-step guide to changing the TV's language settings via the menu.

2.3 How to Connect

Guides on connecting external devices like antennas, HDMI, and component sources.

Channel Search

Instructions for tuning TV channels, including auto and manual search modes.

Changing Channel/Flashback

Methods for changing TV channels and using the flashback feature.

Changing Volume, Mute and Sound Mode

How to adjust volume, mute the TV, and select audio modes.

Adjust Video Setting

How to adjust picture settings like brightness, contrast, color, and sharpness.

Adjust Audio Setting

How to select audio modes like standard, theatre, voice, music, and personal.

Setting / PC

On-screen menu guide for adjusting PC input settings like Auto Adjust and Position.

Other function adjust setting

Accessing and adjusting various TV functions like Password Setting, Video Lock, and Sleep Time.

Parental Control

Details on setting up parental controls for TV content based on ratings.

Sound and OSD

Settings for sound modes, language, and On-Screen Display transparency and timeout.

Media

Instructions for playing multimedia files from USB devices.

Composite and External Sound Connections

Connecting composite video/audio and external audio systems.

2.4 Front Panel Control Knobs

Description of buttons and ports located on the front panel of the TV.

3. Input/Output Specification

3.1 RGB Signal Input

Pin assignments for the 15-pin color display signal cable.

3.2 HDMI Digital Connector Pin Assignments

Pin assignments for the HDMI digital connector.

3.3 Compatible Mode Table

Reference charts for PC and video input signal compatibility and resolutions.

4. Mechanical Instructions

5. Repair Flow Chart

1. No power

Troubleshooting steps for when the TV does not power on.

2. Can't start

Troubleshooting flow for when the TV fails to start up, indicated by a red LED.

3. Abnormal display

Diagnostic steps for issues related to abnormal screen display.

4. No display

Troubleshooting guide for scenarios where the screen remains blank (white LED).

5. Sound problem

Steps to diagnose and resolve issues with no sound or abnormal audio output.

6. Remote control malfunction

Troubleshooting steps for a non-functional remote control.

7. OSD is unstable or can't work normally

Steps to fix issues where the On-Screen Display is unstable or unresponsive.

6. PCB Layout

6.1 Main Board

Visual layout of the main printed circuit board.

6.2 Power Board

Visual layout of the power supply printed circuit board.

6.3 Key Board

Visual layout of the key control board.

6.4 IR Board

Visual layout of the infrared receiver board.

7. Adjustment

Factory Mode

Procedure to enter the TV's factory mode for advanced adjustments.

ADC Adjustment

Adjusting Analog-to-Digital Converter settings for optimal video signal processing.

White Balance Adjustment

Steps to calibrate white balance for accurate color reproduction.

7.2 FW Upgrade

8. Block Diagram

9. Schematic Diagram

9.1 Main Board

Electrical schematic for the main control board.

9.2 Power Board

Electrical schematic for the power supply board.

9.3 Key Board

Electrical schematic for the key input board.

9.4 IR Board

Electrical schematic for the IR receiver board.

10. Exploded View

11. BOM List