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LG 49LF6400-DA User Manual

LG 49LF6400-DA
92 pages
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Printed in KoreaP/NO : MFL68627615 (1503-REV00)
CHASSIS : LT51H
MODEL : 49LF640* 49LF6400-DA
49LF640T-DA
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
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

Table of Contents

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LG 49LF6400-DA Specifications

General IconGeneral
Screen Size49 inches
Display TypeLED
Resolution1920 x 1080
Refresh Rate60 Hz
Smart TVYes
Operating SystemwebOS
HDMI Ports3
USB Ports3
Wi-FiYes
BluetoothNo

Summary

SAFETY PRECAUTIONS

IMPORTANT SAFETY NOTICE

Essential safety information for preventing hazards like shock and fire.

General Safety Guidance

General precautions for safe servicing procedures, including transformer use and handling blown fuses.

Leakage Current Checks

Procedures for performing cold and hot checks to ensure electrical safety before returning the unit.

SERVICING PRECAUTIONS

General Servicing Precautions

Safety rules for handling components, testing, cleaning, and connections during servicing.

Handling Electrostatically Sensitive (ES) Devices and Soldering

Guidelines for preventing ES device damage and best practices for soldering.

SERVICING PRECAUTIONS (Continued)

Component Removal and Replacement Techniques

Detailed methods for removing and replacing ICs, transistors, diodes, fuses, and resistors.

Circuit Board Foil Repair Procedures

Techniques for repairing damaged copper patterns on circuit boards using jumper wires.

SPECIFICATION

Application Range, Test Conditions, and Methods

Defines the scope, test conditions, and methods for product specifications.

General Specifications Overview

Details markets, broadcasting systems, channels, and input/output specifications.

SPECIFICATION (Continued)

External Input Support Formats

Lists supported resolutions, frequencies, and pixel clocks for component inputs.

SPECIFICATION (Continued)

HDMI EDID Data Formats

Specifies EDID data for DTV and PC modes via HDMI, detailing resolutions and frequencies.

SPECIFICATION (Continued)

3D Mode Input Specifications

Details supported resolutions and modes for 3D input via RF and HDMI.

SPECIFICATION (Continued)

HDMI 1.4b 3D Input Specifications

Lists detailed resolutions, frequencies, and proposed 3D modes for HDMI 1.4b input.

SPECIFICATION (Continued)

HDMI-PC and Component 3D Input Specifications

Specifies 3D input modes for HDMI-PC and Component connections.

SPECIFICATION (Continued)

USB and DLNA 3D Input Support

Lists supported resolutions and 3D modes for USB and DLNA inputs.

ADJUSTMENT INSTRUCTION

Scope, Notices, and Adjustment Items Overview

Outlines the manual's scope, important notices, and the general categories of adjustments.

PCB Assembly Adjustment Procedures

Step-by-step guide for downloading MAC Address, ESN Key, and Widevine Key via PC.

ADJUSTMENT INSTRUCTION (Continued)

LAN Port Inspection and ADC Adjustment Procedures

Instructions for LAN port inspection and ADC calibration, including equipment setup and protocols.

ADJUSTMENT INSTRUCTION (Continued)

Factory Adjustment: EDID/DDC Data Download

Explains EDID/DDC communication and provides data tables for various FHD, 2D, and 3D formats.

ADJUSTMENT INSTRUCTION (Continued)

Color Temperature and White Balance Adjustment

Covers equipment setup, specifications, and methods for color temperature and white balance adjustments.

White Balance Adjustment Methods

Explains auto and manual WB calibration methods, including using RS-232C commands and EZ adjust.

White Balance Reference Data

Provides reference coordinates and color temperatures for white balance adjustment based on aging time.

ADJUSTMENT INSTRUCTION (Continued)

HDMI ARC Function Inspection and 3D Pattern Test

Details procedures for inspecting HDMI ARC and performing 3D pattern tests.

ADJUSTMENT INSTRUCTION (Continued)

Local Dimming, Sensor Checks, and Hi-Pot Testing

Covers procedures for checking local dimming, sensors, and performing ground/Hi-Pot safety tests.

ADJUSTMENT INSTRUCTION (Continued)

Default Service Options and USB Download

Guides accessing service options, setting ADC/WB, and performing USB firmware downloads.

BLOCK DIAGRAM

M14+ Main System Block Diagram

Illustrates the main components and connections of the M14+ system.

BLOCK DIAGRAM (Continued)

M14+ I2C Interface Block Diagram

Shows the I2C communication interfaces between the M14+ IC and other components.

BLOCK DIAGRAM (Continued)

Power Distribution Block Diagram

Details the power supply rails and converters for various system components.

BLOCK DIAGRAM (Continued)

Tuner Interface Block Diagrams

Depicts connections for TDJM-B301F/K301F and TDJK-T301F tuners.

BLOCK DIAGRAM (Continued)

Tuner Interface Block Diagrams

Depicts connections for TDJM-B301F/K301F and TDJK-T301F tuners.

BLOCK DIAGRAM (Continued)

Video/Audio Input Signal Flow

Shows how video and audio signals enter the system and connect to the main IC.

BLOCK DIAGRAM (Continued)

Audio Output Signal Paths

Illustrates the audio output paths for speakers, headphones, and digital outputs.

BLOCK DIAGRAM (Continued)

HDMI Interface Connections and Signals

Details the HDMI port connections, DDC signals, TMDS links, and MHL interface.

BLOCK DIAGRAM (Continued)

Panel Interface (EPI) Signal Connections

Shows the EPI interface signals between the main IC and the panel, including power and clock lines.

BLOCK DIAGRAM (Continued)

Panel Interface (LVDS) Signal Connections

Depicts the LVDS interface signals for panel data transmission, including bit selection.

BLOCK DIAGRAM (Continued)

USB, WiFi-BT, and IR-Key-Eye Interfaces

Illustrates the connections for USB ports, WiFi/Bluetooth module, and IR/Key/Eye sensors.

EXPLODED VIEW

Important Safety Notice for Exploded View

Highlights safety precautions related to specific parts identified in the exploded view.

Standard Repair Process Overview

Troubleshooting Categories: Video, Power, Audio

Lists common error categories including video, power, and audio issues for troubleshooting.

Troubleshooting Categories: Function, Noise, Exterior

Covers troubleshooting for function errors, noise issues, and exterior physical defects.

Standard Repair Process - Video Errors

Troubleshooting No Video / Normal Audio

Step-by-step guide to diagnose and fix "No video/Normal audio" issues, checking backlight and power board.

Standard Repair Process - Video Errors (Continued)

Troubleshooting No Video / No Audio

Diagnostic steps for "No video/No audio" faults, focusing on power board voltages and main board checks.

Standard Repair Process - Video Errors (Continued)

Troubleshooting Picture Problems (Broken/Freezing)

Guide for diagnosing picture issues like freezing or breaking, checking RF signal, connections, and software.

Standard Repair Process - Video Errors (Continued)

Troubleshooting Color Errors

Steps to diagnose color errors by input type, checking link cables and external devices.

Standard Repair Process - Video Errors (Continued)

Troubleshooting Bars/Image Retention/Light Spot

Diagnostic flow for screen issues like bars, image retention, or light spots, checking module and software.

Standard Repair Process - Power Errors

Troubleshooting No Power Issues

Steps to diagnose "No Power" errors by checking the power LED, cord, standby voltage, and power board output.

Standard Repair Process - Power Errors (Continued)

Troubleshooting Auto Power Off Issues

Guide for diagnosing "Off when on" or auto power off faults by checking power off modes and voltages.

Standard Repair Process - Audio Errors

Troubleshooting No Audio / Normal Video

Steps to diagnose "No audio" faults by checking menu settings, power board voltages, and speaker connections.

Standard Repair Process - Audio Errors (Continued)

Troubleshooting Audio Discontinuation/Noise

Diagnostic flow for audio problems like noise or discontinuation, checking input signals and external devices.

Standard Repair Process - Function Errors

Troubleshooting Remote Control Operation

Guide for diagnosing normal and motion remote control issues, checking connections, batteries, and signals.

Standard Repair Process - Function Errors (Continued)

Troubleshooting External Device Recognition Errors

Steps to diagnose issues with external device recognition, checking technical information and cables.

Standard Repair Process - Exterior Defects

Troubleshooting Exterior Defects

Procedures for addressing physical defects such as module damage, cabinet damage, or remote control issues.

Standard Repair Process - Noise Issues

Troubleshooting Circuit and Mechanical Noise

Guide for identifying and resolving circuit noise and mechanical noise issues, including module replacement.

Standard Repair Process Detail Technical Manual Contents

Detailed Troubleshooting Index: Video, Power, Audio Errors

Index for detailed procedures on video, power, and audio errors.

Detailed Troubleshooting Index: Function, Noise, Module Defects

Index for detailed procedures on function errors, noise, and module defects.

Standard Repair Process Detail Technical Manual - Video Errors

Troubleshooting No Video/Normal Audio: White Balance Adjustment

Detailed procedure for adjusting white balance to resolve "No video/Normal audio" errors using EZ ADJUST.

Standard Repair Process Detail Technical Manual - Video Errors (Continued)

Troubleshooting No Video/Audio: Power Board Voltage Measurement

Guide for measuring power board voltages, specifically D13V and A13V, to fix "No video/Audio" issues.

Standard Repair Process Detail Technical Manual - Video Errors (Continued)

Troubleshooting Video Lag/Stop: Tuner Signal Strength Check

Procedure for checking tuner input signal strength to resolve video lag or stop issues.

Standard Repair Process Detail Technical Manual - Video Errors (Continued)

Troubleshooting Video Lag/Stop: Version Checking Method

Method for checking the TV's software version to resolve video lag or stop issues.

Standard Repair Process Detail Technical Manual - Video Errors (Continued)

Troubleshooting Bars/Image Retention: Connection Diagram

Illustrates connections and provides guidance on checking screen condition via external input signals.

Standard Repair Process Detail Technical Manual - Video Errors (Continued)

Troubleshooting Video Lag/Stop: Tuner Checking

Guide for checking tuner operation and power supply voltages to resolve video lag or stop issues.

Standard Repair Process Detail Technical Manual - Video Errors (Continued)

Troubleshooting Color Errors: Test Pattern Adjustment

Detailed steps for using the ADJ Key and test patterns to diagnose and fix color errors.

Appendix: T-Con Board Exchange Guide (Part 1)

Visual Examples of T-Con Board Defects

Visual examples of T-Con board defects like solder issues, CNT breaks, and power section problems.

Appendix: T-Con Board Exchange Guide (Part 2)

Visual Examples of T-Con Board Defects

Visual examples of T-Con board defects including abnormal power, display, and gradation issues.

Appendix: LED Driver Board (PSU) Exchange Guide

Visual Examples of LED Driver Board Failures

Visual examples of LED driver board failures such as no light, dim light, or no picture/sound.

Appendix: Module Exchange Guide (Part 1)

Visual Examples of Module Defects: Mura, Leakage, Damage

Visual examples of module defects like panel mura, light leakage, press damage, and crosstalk.

Appendix: Module Exchange Guide (Part 2)

Visual Examples of Module Defects: Blocks, Lines, IC Defects

Visual examples of module defects like vertical/horizontal blocks, lines, and gate TAB IC defects.

Standard Repair Process Detail Technical Manual - Power Errors

Troubleshooting No Power: Front Display LED Check

Guide for checking the front display LED status to diagnose "No Power" errors, noting standby light control UI.

Standard Repair Process Detail Technical Manual - Power Errors (Continued)

Troubleshooting No Power: Voltage Checks

Procedure for checking input and standby voltages, specifically D13V and A13V, on the power board.

Standard Repair Process Detail Technical Manual - Power Errors (Continued)

Troubleshooting Auto Power Off: Power Off Mode Check

Steps to check power off modes via the IN-START menu to diagnose auto power off issues.

Standard Repair Process Detail Technical Manual - Audio Errors

Troubleshooting No Audio: Menu Sound Out Settings

Guide for checking and adjusting sound out settings in the TV menu to resolve "No audio" issues.

Standard Repair Process Detail Technical Manual - Audio Errors (Continued)

Troubleshooting No Audio: Voltage and Speaker Checks

Procedure for checking main board connector conditions, power board voltage, and speaker connectivity.

Standard Repair Process Detail Technical Manual - Function Errors

Troubleshooting Remote Control Issues (IR)

Steps to diagnose IR remote control problems by checking cable conditions, standby voltage, and pre-amp.

Standard Repair Process Detail Technical Manual - Function Errors (Continued)

Troubleshooting Remote Control Issues (Motion/BT)

Guide for diagnosing motion remote and BT issues by checking IR cable, WiFi voltage, and BT version.

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