AOC L42H931

42″LCD TV AOC L42H931(P)
1
Service
Service
Service
Horizontal Frequency
31.5~67.5 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………………..…….…….……….....30
6.3 Inverter Board……………..…….…….……….......33
6.4 Key Board………………………..……..………......34
6.5 IR Board………………………….……..………......34
7.Adjustment……..…………………………................35
8.Block Diagram.……....................................................36
9.Schematic Diagram…..………….......………………...38
9.1 Main Board…………………………………...…......38
9.2 Power Board…………..….….……...…………......48
9.3 Inverter Board…………..….……...………….........53
9.4 Key Board……………….……….…………….........54
9.5 IR Board……...………….……….……………........55
10.Exploded View………………………………….…….56
11. BOM List……………….…….…………….…………..58
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 Menu….....…………………….……….......6
2.3 How to Connect……..……………….…….……….....10
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

AOC L42H931 Specifications

General

Screen Size	42 inches
Aspect Ratio	16:9
HDMI Ports	3
Response Time	5ms
Display Type	LCD
Refresh Rate	60 Hz
Contrast Ratio	5000:1
Brightness	500 cd/m²
Viewing Angle	178°/178°
Sound Output	10W x 2
Display Resolution	1920 x 1080
Input Ports	Component, Composite, VGA

Summary

Safety Notice

Important Safety Notice

Warning on Substitute Parts

Substitution of parts can create shock, fire, or other hazards.

Laser Product Safety Warnings

Dangers of laser radiation exposure when servicing laser products.

Use of Original Replacement Parts

Use only original manufacturer's replacement parts for product reliability.

LCD Module Handling Precautions

Precautions for handling the LCD module to prevent damage.

General Specifications

Operating Instructions

Remote Control Operation

Explains the function of each button on the remote control.

Using On-Screen Menus

Video Menu Settings

Explains video adjustment options like contrast, brightness, color.

Audio Menu Settings

Describes audio adjustments like bass, treble, balance, and surround.

Feature Menu Options

Covers general TV features like language, sleep timer, and captions.

Parental Control Menu

Parental Control Password Setting

Details the process for changing the parental control password.

How to Connect External Devices

Connecting TV Set-Top Box via HDMI

How to connect a set-top box using HDMI for optimal results.

Connecting TV Set-Top Box via Component Video

Step-by-step guide for connecting a set-top box using component video.

Connecting Additional Video Sources

Connecting TV Set-Top Box via Composite Video

Connecting DVD Player via HDMI

Connecting DVD Players

Connecting via DVI

Connecting via Component Video

Connecting via S-Video (AV-2)

Connecting Other Devices

Connecting DVD Player via Composite Video (AV)

Connecting a PC

Front Panel Controls

Repair Flow Chart

Troubleshooting No Power

Diagnostic steps for when the TV has no power.

Troubleshooting TV Not Turning On

Diagnostic steps for when the TV does not turn on.

Troubleshooting Abnormal Image

Diagnostic steps for when the TV displays an abnormal image.

Troubleshooting No ImageDisplay

Diagnostic steps for when the TV has no image or display.

Troubleshooting Sound Issues

Diagnostic steps for when there is no sound or abnormal sound.

Troubleshooting Remote Control Malfunction

Diagnostic steps for when the remote control is malfunctioning.

Troubleshooting OSD Issues

Diagnostic steps for unstable or malfunctioning On-Screen Display.