Haier L22B1120 User Manual

SERVICE MANUAL
LCD TV
Model No. L22B1120
Chassis
MSD318
This service information is designed for experienced repair technicians only and is not designed for use by the general public.
It does not contain warnings or cautions to advise non-technical individuals of potential dangers in attempting to service a product.
Products powered by electricity should be serviced or repaired only by experienced professional technicians. Any attempt to service or repair
the product or products dealt with in this service information by anyone else could result in serious injury or death.
Haier Group
©2009 Qingdao Haier Electronics Co., Ltd.
All rights reserved. Unauthorized copying and distribution is a violation of law.
WARNING

Haier L22B1120 Specifications

General

Screen Size	22 inches
Display Type	LCD
Aspect Ratio	16:9
Brightness	250 cd/m²
Contrast Ratio	1000:1
Response Time	5 ms
HDMI Ports	1
USB Ports	1
Weight	3.5 kg
Viewing Angle	170°/160°
Sound Output	2 x 3W
Input Ports	HDMI, USB, VGA
Power Consumption	35W
Resolution	1366 x 768 (HD)

Summary

General Information and Guidelines

General Guidelines for Servicing

Guidelines for safe and effective servicing, including ESD prevention and lead-free solder use.

Disassembly and Assembly Procedures

Installation and Connection Guide

HDMI and DVI Connections

Detailed instructions for connecting devices using HDMI and HDMI-to-DVI cables.

TV Operation and Controls

Front Panel Controls Explained

Explanation of the function of each button on the TV's front control panel.

Back Panel Connectors Overview

Overview of all input and output connectors located on the back of the TV.

Remote Control Setup and Functions

Electrical Parts and Diagrams

System Block Diagram

Visual representation of the TV's internal architecture and signal flow.

Detailed Circuit Diagrams

Detailed schematics illustrating the electronic circuitry of the TV's main components.

Wiring Connection Diagram

TV User Operation Modes

Picture Menu Settings

Audio Menu Settings

Setup Menu Configuration

Parental Control Setup

Factory Model Access

Procedure to access the hidden factory service mode for advanced adjustments and diagnostics.

Software Update Procedure

Step-by-step guide for updating the TV's firmware using a USB flash drive.

Troubleshooting Common Issues

Simple Troubleshooting Checks

Initial troubleshooting steps for common picture and audio problems.

Main Board Failure Diagnostics

Diagnostic flowcharts for identifying issues related to the main board, such as black or white screens.

LCD Panel Failure Troubleshooting

Troubleshooting guide for common LCD panel failures like vertical or horizontal bars and lines.