LG 55LA66 Series User Manual

Printed in KoreaP/NO : MFL67727008(1302-REV00)
CHASSIS : LB33B
MODEL : 55LA66** 55LA66**-T*
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

LG 55LA66 Series Specifications

General

Screen Size	55 inches
Display Type	LED
Resolution	1920 x 1080
Smart TV	Yes
HDMI Ports	3
USB Ports	3
Wi-Fi	Yes
Audio Output	20W
3D	Yes
Operating System	LG Smart TV
Bluetooth	No

Summary

SAFETY PRECAUTIONS

IMPORTANT SAFETY NOTICE

Critical safety warnings for servicing the TV chassis.

General Safety Guidance

Basic safety advice for technicians during servicing procedures.

Leakage Current Check Procedures

Steps for performing cold and hot leakage current checks.

SERVICING PRECAUTIONS

General Servicing Precautions

Essential guidelines for safe and effective TV servicing.

Electrostatic Discharge (ESD) Prevention

Techniques to protect sensitive electronic components from static damage.

Soldering Best Practices

Recommended methods for soldering components on circuit boards.

SPECIFICATION DETAILS

Application Range and Test Requirements

Defines the scope of specifications and conditions for testing.

Model General Specifications

Comprehensive table of general TV specifications by model.

HDMI Input Specifications

DTV Mode HDMI Input

HDMI specs for DTV, including resolution and frequency.

PC Mode HDMI Input

HDMI specs for PC input, including resolution and frequency.

3D Mode Specifications

HDMI 1.4b 3D Mode

Detailed 3D support specifications for HDMI 1.4b interface.

Multi-Format 3D Input Support

Details 3D support across HDMI-PC, USB, and RF inputs.

ADJUSTMENT INSTRUCTIONS

Automatic Adjustment Procedures

Steps for automatic MAC, HDCP, Widevine, ESN, and LAN settings.

LAN Inspection and Model/Serial Download

Procedures for LAN inspection and downloading model/serial information.

MANUAL ADJUSTMENT PROCEDURES

EDID Data Configuration

Covers 3D, 2D FHD, 2D HD EDID data specifications.

White Balance Adjustment Process

Detailed steps for performing white balance adjustment.

FUNCTIONAL CHECKS AND SERVICE OPERATIONS

Specific Functional Checks

Procedures for testing Local Dimming, Magic Remote, 3D, and Wi-Fi.

Service Tools and Procedures

Covers tool options, ship-out check, GND/pressure check, and USB S/W download.

SYSTEM ARCHITECTURE AND COMPONENTS

Block Diagrams

Visual representation of system modules and their interconnections.

Exploded View of Components

Illustrated breakdown of the TV's internal parts for identification.

MAIN PCB AND INTERCONNECTIONS

Main PCB Component Layout

Identification of key components on the main PCB for various models.

Interconnection Diagrams

Visual guides showing cable routing and PCB connections.

REMOTE CONTROL AND WI-FI MODULE

Magic Remote Control System

Overview, buttons, block diagram, functions, and pairing for Magic Remote.

Wi-Fi Module Features and Specifications

Details on Wi-Fi module capabilities and technical specifications.

CONTENT PROTECTION AND SERVICES

Widevine, HDCP 2.0, and Netflix

Explanation of content protection technologies and streaming services.

Digital Transmission Content Protection (DTCP)

Definition and cryptographic keys used in DTCP for content protection.

STANDARD REPAIR PROCESS GUIDE

Troubleshooting Symptom Index

Categorized list of common TV errors and their corresponding page numbers.

Detailed Repair Process Flows

Step-by-step troubleshooting guides for Video, Power, Audio, and Function errors.

REPAIR APPENDICES AND GUIDELINES

Component Exchange Visual Guides

Visual examples for replacing EPI cables, Main B/D, LED driver, and modules.

Specific Repair Procedures

Detailed steps for front display LED, power voltages, remote control, and VCOM adjustments.