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LG 32LF550B Service Manual

LG 32LF550B
74 pages
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Printed in KoreaP/NO : MFL68625507 (1502-REV00)
CHASSIS : LB55H
MODEL : 32LF550B 32LF550B-TA
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
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
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LG 32LF550B Specifications

General IconGeneral
Screen shapeFlat
Response time- ms
Display diagonal32 \
Display brightness- cd/m²
Display resolution1366 x 768 pixels
Native refresh rate50 Hz
LED backlighting type-
Display diagonal (metric)80 cm
Supported graphics resolutions1366 x 768
MHL version2.0
Audio formats supportedAAC, MP3, OGG, PCM, WAV, WMA
Image formats supportedBMP, JPG, PNG
Video formats supported3G2, 3GP, AVC, AVI, DIVX, H.264, M2TS, M4V, MKV, MOV, MPEG4, MTS, TP, TS, WMV, XVID
Digital signal format systemDVB-T
Internet TVNo
Audio decodersDolby Digital
RMS rated power10 W
Number of speakers2
DVI-D ports quantity0
USB 2.0 ports quantity1
Product colorGray
Panel mounting interface200 x 200 mm
Power consumption (standby)- W
Sustainability certificatesENERGY STAR
Weight and Dimensions IconWeight and Dimensions
Depth (with stand)208 mm
Height (with stand)480 mm
Weight (with stand)5900 g
Depth (without stand)57 mm
Width (without stand)731 mm
Height (without stand)442 mm
Weight (without stand)5700 g

Summary

SAFETY PRECAUTIONS

General Service Guidance

Basic safety instructions for servicing electronic equipment.

Leakage Current Safety Checks

Procedures for verifying AC leakage current to prevent shock hazards.

SERVICING PRECAUTIONS

General Servicing Practices

Essential rules for safe and effective electronic device repair.

Handling Electrostatic Discharge Sensitive Devices

Precautions for preventing damage to ES components.

Soldering Best Practices

Guidelines for proper soldering techniques and tools.

Component Replacement Procedures

Step-by-step instructions for replacing ICs, transistors, diodes, and fuses.

Circuit Board Trace Repair Methods

Techniques for repairing damaged conductive traces on circuit boards.

SPECIFICATIONS

Application Range and Test Requirements

Defines the scope of specifications and testing conditions.

Test Methods and General Model Specs

Outlines testing methodologies and overall TV model specifications.

Video Input Interface Specifications

Details supported component and HDMI video input formats.

ADJUSTMENT INSTRUCTIONS

Preparation and PCB Check Process

Steps for preparing, checking the main PCB, and downloading files.

Software Update Procedures

Instructions for updating TV software via USB.

ADC Calibration and Function Verification

Procedures for calibrating ADC and checking TV functions.

Assembly Line and White Balance Adjustment

Process for assembly line adjustments and white balance calibration.

EDID Data Management and Safety Testing

Handling EDID data, download, and safety tests like GND/HI-POT.

BLOCK DIAGRAMS

System Architecture Overview

High-level diagram of the TV's main components and connections.

I2C Communication Paths

Illustrates the I2C bus connections between components.

Power Supply Circuitry

Schematic diagram of the TV's power supply section.

EXPLODED VIEW

Component Layout and Identification

Visual guide showing parts and their physical locations on the TV.

A. Video Error Troubleshooting

No Video or Normal Audio Issues

Steps to address scenarios with no video but normal audio.

No Video and No Audio Issues

Troubleshooting steps for complete lack of video and audio.

Picture Break or Freezing

Diagnostic procedures for frozen or broken video display.

Signal Tuning and Reception Problems

Steps to resolve issues with signal tuning and reception.

Color Display Malfunctions

Guide for diagnosing and fixing problems related to incorrect color display.

Display Artifacts and External Input Issues

Troubleshooting bars, spots, and external input color errors.

B. Power Error Troubleshooting

No Power Condition

Steps to resolve scenarios where the TV does not power on.

Intermittent Power Operation

Troubleshooting for issues like auto power on/off or turning off during use.

C. Audio Error Troubleshooting

No Audio or Normal Video

Steps to address scenarios with no audio but normal video.

Audio Distortion or Noise

Diagnostic procedures for distorted, discontinuous, or noisy audio.

D. Function Error Troubleshooting

Remote Control and Switch Malfunctions

Steps to troubleshoot remote control and physical button issues.

External Device Recognition Errors

Guide for diagnosing issues with connected external devices.

E. Noise Troubleshooting

Circuit and Mechanical Noise Diagnosis

Procedures for identifying and fixing circuit and mechanical noises.

F. Exterior Defect Troubleshooting

Physical Damage Assessment

Steps for identifying and resolving external physical damage.

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