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LCD TV
SERVICE MANUAL
CHASSIS : LD01B
MODEL : 42LD420/420C/420N/425/428
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL50326847 (1102-REV01)
North/Latin America
Europe/Africa
Asia/Oceania
42LD420/420C/420N/425/428-ZA
42LD421/426
http://aic.lgservice.com
http://eic.lgservice.com
http://biz.lgservice.com
42LD421/426-ZB
Printed in Korea
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Summarization of Contents
SAFETY PRECAUTIONS
IMPORTANT SAFETY NOTICE
Critical safety information and component identification.
General Guidance
General advice for safe servicing practices.
Leakage Current Hot Check
Procedure to check AC leakage current.
General Servicing Precautions
Fundamental rules for safe receiver servicing.
Electrostatically Sensitive (ES) Devices
Techniques to prevent damage to static-sensitive components.
General Soldering Guidelines
Best practices for soldering electronic components.
IC Remove/Replacement
Methods for removing and installing integrated circuits.
Circuit Board Foil Repair
Procedures for repairing damaged printed circuit board foil.
SPECIFICATION
Application range
Defines the scope of the specification for LD01B chassis TVs.
Requirement for Test
Specifies conditions and procedures for testing.
Test method
Outlines the methods for performance and safety testing.
Module General Specification
Details general specifications of the LCD module.
Module optical specification(AUO)
Provides optical characteristics of the AUO module.
Component Video Input (Y, CB/PB, CR/Pr)
Lists supported component video resolutions and frequencies.
RGB (PC)
Details supported RGB (PC) input resolutions and frequencies.
HDMI Input
Lists supported HDMI input resolutions and frequencies.
ADJUSTMENT INSTRUCTION
Application Range
Specifies that instructions apply to LD01B chassis LCD TVs.
Designation
Outlines the order and conditions for adjustments.
Main PCB check process
Procedures for checking the main PCB, including boot file download.
ADC Process
Step-by-step guide for Analog-to-Digital Converter calibration.
Function Check
Verifies display and sound output after adjustments.
Total Assembly line process
Covers the entire process for assembly line adjustments.
Adjustment Preparation
Details equipment and conditions needed before adjustment.
DDC EDID Write (RGB 128Byte)
Procedure for writing EDID data for RGB interface.
DDC EDID Write (HDMI 256Byte)
Procedure for writing EDID data for HDMI interface.
EDID DATA
Explains the format and structure of EDID data.
V-COM Adjust
Adjustment procedure for V-COM voltage.
Outgoing condition Configuration
Steps for configuring the TV after adjustments.
Internal pressure
Test for internal pressure resistance.
Model name & Serial number D/L
Process for downloading model name and serial number.
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