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LG 32LJ550B Service Manual

LG 32LJ550B
52 pages
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P/NO : MFL69920608 (1702-REV00)
CHASSIS : LA75M
MODEL : 32LJ550B
32LJ550B-UA
Internal Use Only
LED TV
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

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LG 32LJ550B Specifications

General IconGeneral
Screen Typeled
Wall Mount100mm x 100mm
Tunerdigital
Screen Size31.5 inches, 32 inches
Refresh Rate60hz
HDRno
Built-In Speakersyes
Speakers Output10 watts
USB Ports1
Ethernetyes
RF Antennano
Networkbuilt-in wi-fi, ethernet
Digital Optical Audio Outputs1
Component Video Inputs1
Composite Video Inputs1
DVI0
SmartTVwebos
Remote Controlstandard
3Dno
Power Consumption81 kilowatt hours
Depth with Stand7.1 inches
Height with Stand18.7 inches
Width with Stand28.7 inches
Net Weight with Stand11 pounds
Depth without Stand3.1 inches
Height without Stand17.2 inches
Net Weight without Stand10.8 pounds

Summary

LED TV Service Manual

Safety Precautions

Important Safety Notice

Highlights critical safety information for technicians performing repairs.

General Guidance

Provides general advice for safe servicing procedures.

Servicing Precautions

General Servicing Precautions

Outlines standard procedures and warnings for servicing.

Electrostatically Sensitive Devices (ES)

Details precautions for handling sensitive electronic components.

Soldering Guidelines

Provides best practices for soldering electronic components safely.

Component Replacement

Procedures for replacing ICs, transistors, diodes, fuses, and resistors.

Circuit Board Foil Repair

Techniques for repairing damaged circuit board foil.

Specifications

Application Range and Test Conditions

Defines scope, test parameters, and methods for TV specifications.

General Specifications

Lists key technical specifications of the TV.

External Input Support Format

Details supported video input formats.

Software Update

USB and Network Update Methods

Instructions for updating TV software via USB or network.

Block Diagram

Power Block Diagram

Illustrates the power supply circuit block.

Exploded View

Disassembly

Screw Disassembly

Instructions for removing screws during disassembly.

Snap-Based Disassembly

Guidance on releasing snap-fit components.

Upward Removal Technique

Method for pulling components upwards.

Trouble Shooting Guide

Video Error Diagnostics

Troubleshooting steps for various video display issues.

Power Error: No Power

Troubleshooting steps for a completely dead TV.

Power Error: Auto Power Off

Diagnosing issues with unexpected power cycling.

Audio Error: No Audio/Normal Video

Steps to resolve audio output problems.

Audio Error: Distortion, Discontinuation, Noise

Troubleshooting audio quality issues.

Function Error: Remote Control

Diagnosing remote control and button issues.

Function Error: WiFi Operation

Troubleshooting WiFi connectivity and functionality.

Function Error: External Device Recognition

Steps for when external devices are not recognized.

Noise and Mechanical Issues

Diagnosing and rectifying noise and physical damage.

Exterior Defect

Procedures for addressing physical damage to the TV.

Video Error: Check Backlight

Inspecting the LCD backlight for video issues.

Video Error: Check White Balance

Procedure for verifying and adjusting white balance settings.

Video Error: Check Tuner Signal Strength

Method for checking tuner signal quality.

Video Error: Check Software Version

Guide to checking the TV's software version.

Video Error: Tuner Component Check

Inspecting components related to the tuner.

Video Error: Connection Diagram for Bars/Image Issues

Illustrates connections for video signal diagnosis.

Video Error: Check Link Cable Connection

Verifying the reconnection of the link cable for color errors.

Video Error: Adjustment Test Patterns

Using test patterns via the ADJ key for color diagnostics.

Power Error: Check Front Power Indicator

Inspecting the TV's front power indicator status.

Power Error: Check Input Voltage & ST-BY

Verifying power input and standby voltages.

Power Error: Check Power Off Mode

Method for checking power off modes and status.

Audio Error: Check Menu for No Audio

Steps to check audio settings via the menu.

Audio Error: Voltage & Speaker Check

Verifying voltage and speaker connections for audio issues.

Function Error: Remote Control Operation Check

Method for checking the remote control's functionality.

Function Error: Remote Control & WiFi Check

Verifying remote control function related to WiFi.

Appendices: Component Exchange Guides

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