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LED TV
SERVICE MANUAL
CHASSIS : LB50H
MODEL : 43/49LF5900/590T/590Y
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL69330501 (1507-REV00)
North/Latin America
Europe/Africa
Asia/Oceania
43/49LF5900/590T/590Y-TB
Internal Use Only
http://aic.lgservice.com
http://eic.lgservice.com
http://biz.lgservice.com
Printed in Korea
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Table of Contents
Related Manuals for LG 49LF590Y
Summarization of Contents
SAFETY PRECAUTIONS
General Safety Guidance
Essential safety advice for servicing, including using isolation transformers and handling fuses.
AC Leakage Current Checks
Procedures for performing cold and hot checks of AC leakage current on the unit.
SERVICING PRECAUTIONS
General Servicing Practices
Guidelines for safe component removal, high voltage testing, and contact cleaning.
Handling Electrostatic Sensitive Devices
Techniques to prevent damage to sensitive electronic components from static discharge.
Soldering Techniques and Guidelines
Best practices for soldering, including tool selection, tip maintenance, and proper methods.
SPECIFICATION
Application Range
Defines the chassis and model range to which these specifications apply.
Test Requirements and Conditions
Specifies environmental conditions and power requirements for product testing.
Test Methodologies
Outlines performance, safety, and wireless test methods.
Model General Specifications
Details market, TV system, channel storage, and input specifications.
External Input Support Formats
Component Input Formats
Lists supported resolutions, frequencies, and formats for component video input.
HDMI Input Formats
Details supported resolutions and frequencies for DTV and PC modes via HDMI.
ADJUSTMENT INSTRUCTION
Application Range & Designation
Specifies the applicable chassis and general conditions for adjustments.
Automatic Adjustment Procedures
Details downloads for MAC, Widevine, ESN, and HDCP keys.
LAN Inspection and Model/Serial Download
Guides on LAN testing and downloading model/serial information.
Wi-Fi, Tool Option, Ship-out Mode, GND/Pressure, Audio Tests
Covers Wi-Fi, tool options, ship-out mode, pressure checks, and audio testing.
Manual Adjustment Procedures
EDID DATA
Provides information on EDID data structure for HDMI inputs.
White Balance Adjustment
Covers objectives, conditions, equipment, and methods for white balance calibration.
BLOCK DIAGRAM
MKT(A5LR) Block Diagram
Overall system block diagram showing major component interconnections.
I2C Communication Diagram
Illustrates the I2C bus connections between the main IC and various peripherals.
Tuner/CI Block Diagram
Details the tuner and CI slot interface connections and signals.
POWER Block Diagram
Shows the power supply distribution and voltage rails for different TV components.
TROUBLE SHOOTING GUIDE
Video Error - No Video/Normal Audio
Troubleshooting steps for no video with normal audio, focusing on white balance.
Video Error - No Video/Audio
Steps to diagnose no video and no audio issues by checking power board voltages.
Video Error - Video Lag/Stop
Procedure for checking tuner input signal strength and lag/stop issues.
Video Error - Bars, Spots, Image Defects
Troubleshooting for visual defects like bars, spots, or residual images.
Power Error - No Power
Steps to diagnose no power issues by checking the front display LED and standby voltage.
Power Error - Intermittent Power Issues
Method to check power off modes and diagnose intermittent power issues.
Audio Error - No Audio/Normal Video
Procedure for diagnosing no audio issues by checking menu settings and speaker output.
Function Error - Remote Control Operation
Steps to troubleshoot normal remote control operation issues.
Function Error - Motion Remote/Connectivity
Steps to troubleshoot motion remote control and Bluetooth/Wi-Fi connectivity.
Appendix: Component Exchange Guides
T-Con Board Exchange Guide (1)
Visual guide to common defects requiring T-Con board replacement.
T-Con Board Exchange Guide (2)
Visual guide to additional defects indicating T-Con board replacement is needed.
LED Driver/PSU Board Exchange
Visual examples of issues related to the LED driver board or power supply unit.
Module Exchange Guide (1)
Examples of panel defects like mura, light leakage, or press damage requiring module exchange.
Module Exchange Guide (2)
Visual examples of unrepairable panel defects like vertical/horizontal blocks or lines.
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