Table of Contents
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LED TV
LED TV
SERVICE MANUAL
SERVICE MANUAL
CHASSIS : LB45B
CHASSIS : LB45B
MODEL : 42LB550A
MODEL : 42LB550A
42LB552A
42LB552A
CAUTION
CAUTION
BEFORE SERVICING THE CHASSIS,
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
North/Latin
North/Latin
America
America
Europe/Africa
Europe/Africa
Asia/Oceania
Asia/Oceania
42LB550A-TA
42LB550A-TA
42LB552A-TB
42LB552A-TB
Internal Use Only
Internal Use Only
http://aic.lgservice.com
http://aic.lgservice.com
http://eic.lgservice.com
http://eic.lgservice.com
http://biz.lgservice.com
http://biz.lgservice.com
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Table of Contents
Related Manuals for LG 42LB552A
Summarization of Contents
SAFETY PRECAUTIONS
IMPORTANT SAFETY NOTICE
General safety warnings and precautions for servicing.
General Guidance
Guidelines for safe servicing practices and component replacement.
Leakage Current Hot Check
Procedure for checking leakage current to prevent shock hazards.
SERVICING PRECAUTIONS
General Servicing Precautions
Basic precautions before and during servicing.
Handling ES Devices
Precautions for handling Electrostatic Sensitive devices.
General Soldering Guidelines
Recommendations for proper soldering techniques.
IC Remove/Replacement
Procedure for removing and replacing Integrated Circuits.
Discrete Transistor Removal/Replacement
Steps for replacing discrete transistors.
Circuit Board Foil Repair
Methods for repairing damaged copper foil on circuit boards.
SPECIFICATION
Application Range
Defines the scope of specifications for the LB45B chassis.
Requirement for Test
Specifies conditions and parameters for testing.
Test Method
Outlines the methods used for testing.
Model General Specification
Details general specifications for the models.
ADJUSTMENT INSTRUCTION
Application Range
Specifies the applicability of instructions for the LB45B chassis.
Designation
Details important notes and conditions for adjustment procedures.
EDID Download
Information and methods for EDID data download.
WHITE BALANCE ADJUSTMENT
Overview
Explains the objective and working principle of W/B adjustment.
Adj. condition and cautionary items
Specifies conditions and precautions for white balance adjustment.
Equipment
Lists the necessary equipment for adjustment.
Adjustment Command (Protocol)
Details RS-232C commands for auto-adjustment.
Adjustment method
Describes the procedure for automatic white balance calibration.
Medium / Warm Mode
Details adjustment modes for color temperature (Medium/Warm).
Reference
Specifies color temperature and coordinate references for adjustment.
Tool Option Setting
Guides setting tool options for different countries.
Ship-out Mode Check
Procedure for checking the unit before shipment.
Audio Output Check
Procedure for checking audio output.
OPTIONAL ADJUSTMENTS
Manual ADC Calibration
Steps for manual adjustment of ADC calibration.
Manual White balance Adjustment
Details conditions and precautions for manual W/B adjustment.
STANDARD REPAIR PROCESS: VIDEO ERROR
No video/Normal audio
Troubleshooting for TVs with no video but normal audio.
No video/ No audio
Troubleshooting for TVs with no video and no audio.
Picture Issues & Tuning Fail
Troubleshooting for picture problems, freezing, and tuning failures.
Color error
Troubleshooting steps for color-related display errors.
Visual Artifacts
Troubleshooting for bars, residual images, light spots, and similar issues.
External Device Color Error
Troubleshooting color issues with external devices.
STANDARD REPAIR PROCESS: POWER ERROR
No power
Troubleshooting steps when the TV does not turn on.
Power Off Issues
Troubleshooting for unexpected power-off events.
STANDARD REPAIR PROCESS: AUDIO ERROR
No audio/Normal video
Troubleshooting steps for no audio with normal video.
Audio Disruption/Noise
Troubleshooting for audio problems like crackling or dropouts.
STANDARD REPAIR PROCESS: FUNCTION ERROR
Remote Control & Local Switch Issues
Troubleshooting for remote control and local button malfunctions.
External Device Recognition Error
Troubleshooting issues with connected external devices.
STANDARD REPAIR PROCESS: NOISE
Circuit and Mechanical Noise
Diagnosing and resolving circuit or mechanical noise issues.
STANDARD REPAIR PROCESS: EXTERIOR DEFECT
Exterior Damage
Procedures for addressing physical damage to the TV unit.
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