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LG 49UF640 SERIES User Manual

LG 49UF640 SERIES
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Printed in KoreaP/NO : MFL69305903 (1506-REV00)
CHASSIS : LD59R / LD5ZR
MODEL : 43/49UF640* 43/49UF640*-ZA
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 49UF640 SERIES Specifications

General IconGeneral
Screen Size49 inches
Display TypeLED
HDRNo
Smart TVYes
Wi-FiYes
HDMI Ports3
USB Ports2
Operating SystemwebOS
Refresh Rate60 Hz
BluetoothNo
Resolution3840 x 2160

Summary

SAFETY PRECAUTIONS

IMPORTANT SAFETY NOTICE

Crucial safety guidelines for servicing the receiver to prevent hazards.

SERVICING PRECAUTIONS

General Servicing Precautions

Procedures for safe component removal, testing, and handling of electrical parts.

Electrostatically Sensitive (ES) Devices

Techniques to prevent damage to sensitive electronic components from static electricity.

General Soldering Guidelines

Best practices for soldering, including tool usage and temperature control.

SPECIFICATION

1. Application Range

Defines the LED TV models and chassis this specification applies to.

4. Model General Specification

Details general specifications for various markets and supported features.

5. External Input Format

Lists standard levels and resolutions for video/audio input signals.

ADJUSTMENT INSTRUCTION

3.1. MAC address D/L, CI+ key D/L, Widevine key D/L, ESN D/L, HDCP2.0 D/L

Instructions for downloading critical security and identification data via USB.

3.2. LAN Inspection

Procedure for checking LAN connectivity and network settings on the TV.

3.3. WIDEVINE key Inspection

Steps to verify Widevine key data input within the TV's service menu.

MANUAL ADJUSTMENT

4.1. EDID(The Extended Display Identification Data)/DDC(Display Data Channel) download

Procedure for downloading EDID data for optimal display resolution and information sharing.

4.1.5. Green Eye inspection guide(Depending on model)

Steps to inspect the Intelligent Sensor module's functionality and backlight response.

V-COM ADJUST (ONLY FOR EPI model)

4.2.1 Overview

Objective and mechanism for reducing panel V-COM voltage deviation to prevent flicker.

4.2.5. Adj. method

Detailed procedure for performing automatic and manual V-COM adjustments.

WHITE BALANCE ADJUSTMENT

4.3.1. Overview

Objective and method to reduce panel W/B deviation for color accuracy.

4.3.5. Adj. method

Procedures for automatic and manual white balance adjustment based on color temperature.

LOCAL DIMMING FUNCTION CHECK

4.4. Local Dimming Function Check

Steps to check the local dimming function by observing backlight movement.

MAGIC MOTION REMOTE CONTROL TEST

4.5. Magic Motion Remote control test

Procedure for testing and pairing the Magic Motion remote control with the TV.

3D FUNCTION TEST

4.6. 3D function test

Instructions for inputting 3D test patterns and checking the OSD.

OPTION SELECTION PER COUNTRY

4.7. Option selection per country

Guide for selecting country-specific options using the adjustment remote control.

HDMI ARC FUNCTION INSPECTION

4.8. HDMI ARC Function Inspection

Procedure to test HDMI ARC functionality by checking audio output.

GND AND INTERNAL PRESSURE CHECK

5.1. Method

Steps for performing auto-checks for ground and internal pressure.

USB S/W DOWNLOAD (SERVICE ONLY)

7. USB S/W Download(Service only)

Instructions for downloading software updates via USB for service purposes.

BLOCK DIAGRAM

1. LM14A(+URSA11)

High-level overview of the main system components and their interconnections.

EXPLODED VIEW

IMPORTANT SAFETY NOTICE

Safety warnings related to handling specific parts during disassembly.

IR/KEY

IR/KEY

Schematic for the IR receiver and keypad interface.

ETHERNET BLOCK

Ethernet Block

Diagram showing the Ethernet interface circuitry and connections.

AUDIO AMP (NTP7515)

Audio AMP (NTP7515)

Schematic detailing the connections and operation of the Audio Amplifier IC.

TU_CIRCUIT

TU_CIRCUIT

Schematic of the Tuner circuit, including option names and ground separation.

LNB PART

DVB-S2 LNB Part

Circuit diagram for the DVB-S2 LNB part, including power and protection.

T-Con

T-Con

Schematic for the T-Con board, showing EPI connections and power sequencing.

eMMC I/F

eMMC I/F

Interface diagram for the eMMC memory, including power and data connections.

TUNER EMS GND SEPERATION

TUNER EMS GND SEPERATION

Diagram illustrating tuner ground separation for EMS and error pin information.

MICOM

MICOM

Schematic of the Renesas MICOM, including power sequence and option settings.

USB

USB

Diagram for the USB connector and its power/data connections.

STANDARD REPAIR PROCESS

A. Video error

Troubleshooting steps for various video issues like no video, broken picture, color errors.

B. Power error

Troubleshooting steps for power-related issues like no power or auto power off.

C. Audio error

Troubleshooting steps for audio issues like no audio or distorted sound.

D. Function error

Troubleshooting steps for errors related to remote control, Wi-Fi, and camera functions.

E. Noise

Steps to diagnose and resolve circuit or mechanical noise issues.

F. Exterior defect

Procedures for addressing physical damage like module, cabinet, or remote defects.

APPENDIX : EXCHANGE MAIN BOARD (1)

Appendix : Exchange Main Board (1)

Visual guide to common defects requiring main board replacement.

APPENDIX : EXCHANGE POWER BOARD (PSU)

Appendix : Exchange Power Board (PSU)

Visual guide to common defects indicating power board (PSU) replacement.

APPENDIX : EXCHANGE THE MODULE (1)

Appendix : Exchange the Module (1)

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