EasyManua.ls Logo

LG 20LB45 Series - User Manual

LG 20LB45 Series
35 pages
Print Icon
To Next Page IconTo Next Page
To Next Page IconTo Next Page
Loading...
Printed in KoreaP/NO : MFL68122401 (1401-REV00)
LED TV
SERVICE MANUAL
North/Latin America http://aic.lgservice.com
Europe/Africa http://eic.lgservice.com
Asia/Oceania http://biz.lgservice.com
Internal Use Only
CHASSIS : LB45S
MODEL : 20LB45** 22LN45**-T*
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
Question and Answer IconNeed help?

Do you have a question about the LG 20LB45 Series and is the answer not in the manual?

Summary

LG LED TV Service Manual

Safety Precautions

Important Safety Notice

Essential safety information regarding special parts and design modifications.

General Guidance for Servicing

Provides general advice on using isolation transformers and handling components safely.

Leakage Current Cold Check Procedure

Details the process for performing AC leakage current checks on exposed metallic parts.

Leakage Current Hot Check Procedure

Outlines the method for measuring AC voltage across a resistor for leakage current.

Servicing Precautions

General Servicing Precautions

Lists essential precautions for all servicing tasks, including unplugging power and handling components.

Handling Electrostatic Sensitive Devices

Provides techniques to prevent damage to ES devices from static electricity.

General Soldering Guidelines

Covers proper techniques and tools for soldering electronic components.

Component Removal and Replacement Procedures

Details methods for replacing ICs, transistors, diodes, fuses, and resistors.

Circuit Board Foil Repair Techniques

Details methods for repairing damaged copper traces on printed circuit boards.

Specifications

Application Range and Test Requirements

Defines the scope of specifications and the conditions for testing the TV.

Model General Specifications

Provides general specifications for the TV models covered.

Input Signal Specifications (Component and HDMI)

Lists supported resolutions and frequencies for Component Video and HDMI inputs.

HDMI Input (DTV) Specifications

Lists supported resolutions and frequencies for HDMI DTV input.

Adjustment Instructions

Application Range and Designation Notes

States the scope and provides crucial notes for performing adjustments.

ADC Calibration Procedure

Explains the automatic and manual ADC calibration process.

EDID Download Process

Details the overview, equipment, and method for EDID data download.

White Balance Adjustment Overview

Covers the objective, working principle, and conditions for white balance adjustment.

Adjustment Command Protocol

Lists RS-232C commands and their functions for auto-adjustment.

Medium and Warm Mode Adjustments

Details the purpose and principles for adjusting medium and warm white balance modes.

Tool Option Settings and Inspection

Describes how to set tool options and perform country-specific inspections.

Safety Checkpoints

Lists critical voltage and current checks for safety compliance.

USB Software Download Procedure

Explains the steps for downloading software via USB.

Trouble Shooting

Troubleshooting: No Power Issue

Provides a flowchart for diagnosing and resolving no power problems on the main PCB.

Troubleshooting: No Raster (Black Screen)

Offers a flowchart to diagnose issues with no picture display despite power.

Troubleshooting: Abnormal;No Screen (All Inputs)

Provides a flowchart for diagnosing abnormal or no screen issues across all inputs.

Troubleshooting: Abnormal Screen (TV Input)

A flowchart for diagnosing abnormal screen issues specifically for TV input.

Troubleshooting: Abnormal Screen (AV Input)

Flowchart for diagnosing abnormal screen issues related to AV input.

Troubleshooting: Abnormal Screen (RGB PC Input)

Flowchart for diagnosing abnormal screen issues with RGB PC input.

Troubleshooting: Abnormal Screen (HDMI Input)

Flowchart for diagnosing abnormal screen issues with HDMI input.

Troubleshooting: No Sound (All Sources)

Flowchart for diagnosing and resolving issues with no sound from any source.

Troubleshooting: Abnormal Sound (TV Input)

Flowchart for diagnosing abnormal sound issues specifically for TV input.

Troubleshooting: Abnormal Sound (AV Input)

Flowchart for diagnosing abnormal sound issues with AV input.

Troubleshooting: Abnormal Sound (HDMI Input)

Flowchart for diagnosing abnormal sound issues with HDMI input.

Block Diagram

Disassembly Working Guide

Cabinet Disassembly

Instructions for disassembling the TV cabinet.

Back Cover Disassembly

Instructions for removing and disassembling the back cover.

Exploded View

LG 20LB45 Series Specifications

General IconGeneral
Screen Size20 inches
Display TypeLED
Resolution1366 x 768
Aspect Ratio16:9
Refresh Rate60 Hz
Sound Output5W x 2
InputsHDMI, USB

Related product manuals