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LG 42LA62 Series User Manual

LG 42LA62 Series
128 pages
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Printed in KoreaP/NO : MFL67727122 (1302-REV00)
CHASSIS : LD33B
MODEL : 42LA62** 42LA62**-Z*
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 42LA62 Series Specifications

General IconGeneral
Screen Size42 inches
Display TypeLED
Resolution1920 x 1080
HDMI Ports3
Smart TVYes
3DNo
Wi-FiYes
Audio Output20W
Energy RatingA+

Summary

LED TV Service Manual

Safety Precautions

Important Safety Notices

General safety guidelines to prevent shock, fire, and hazards.

General Servicing Guidance

Use of isolation transformers, handling fuses, and wire management during servicing.

AC Leakage Current Cold Check

Procedure for checking AC leakage current with the unit unplugged.

AC Leakage Current Hot Check

Procedure for checking AC leakage current with the unit plugged in.

Servicing Precautions

General Servicing Guidelines

Precautions for component removal, testing, cleaning, and handling heat sinks.

Handling Electrostatic Sensitive Devices

Techniques to prevent static discharge damage to sensitive electronic components.

Soldering Best Practices

Guidelines for soldering iron usage, tip maintenance, and proper soldering techniques.

Component Replacement Procedures

IC Replacement Procedures

Methods for removing and replacing Integrated Circuits (ICs) on the circuit board.

Fuse and Resistor Replacement

Instructions for replacing fuses and resistors, ensuring proper spacing and crimping.

Circuit Board Foil Repair

Techniques for repairing damaged circuit board copper traces using jumper wires.

Product Specifications

Specification Application Range

Identifies the LED TV models covered by this specification document.

Test Requirements

Outlines the environmental and power conditions for product testing.

General Model Specifications

Covers market, country support, and satellite specifications for various models.

Broadcast and Receiving Specifications

Broadcasting System Support

Lists supported broadcasting standards like PAL, SECAM, DVB-T/C/S/S2.

Program Coverage Details

Defines the range of digital and analog TV channels supported.

Receiving System Standards

Details analog and digital receiving system types and modulations.

HDMI Input Specifications

HDMI Input DTV Mode

Lists resolutions, frequencies, and pixel clocks for DTV signals via HDMI.

HDMI Input PC Mode

Lists resolutions, frequencies, and pixel clocks for PC signals via HDMI.

3D Input Modes Specifications

RF Input (Manual 3D)

Specifies resolutions and proposed 3D modes for manual RF input.

USB Input (Manual 3D)

Lists resolutions and proposed 3D modes for manual USB input.

Adjustment Instructions

Adjustment Application Range

Defines the LED TV models covered by these adjustment instructions.

Automatic Adjustment Procedures

Steps for MAC address, CI+ key, Widevine key, ESN, and HDCP downloads.

LAN Inspection Process

Steps for inspecting LAN connection, equipment, and confirming network status.

Key Checks and Downloads

Widevine Key Inspection

Confirms Widevine key input data in the "IN START" MENU Mode.

LAN Port Inspection (Ping Test)

Details equipment setup and execution of a LAN port ping test.

Model and Serial Number Download

Instructions for downloading model name and serial number, including manual methods.

CI+ Key Checking

Verifies if the CI+ Key has been successfully downloaded via the 'In Start' menu.

Manual Adjustment Procedures

EDID Data Information

Details on 3D EDID data, including reference points and product identifiers.

White Balance Adjustment Overview

Explains the objective and working principle of white balance adjustment.

Adjustment Methods and References

Manual Adjustment Steps

Step-by-step guide for both automatic and manual adjustment processes.

White Balance Reference Data

Provides coordinate and color temperature data for white balance adjustments.

Function Checks and Tests

Local Dimming Function Check

Steps to verify the functionality of the local dimming feature.

Magic Motion Remote Test

Procedure for testing Magic Motion remote control results via OSD.

3D Function Testing

Instructions for inputting 3D test patterns and verifying OSD display.

System Checks and Measurements

LNB Voltage and 22KHz Tone Check

Method and results for checking LNB voltage and 22KHz tone for satellite reception.

Ground and Internal Pressure Checks

Procedures for performing GND and internal pressure auto-checks.

Software Download Procedures

USB Software Download (Service Only)

Steps for downloading software via USB, including version checks and tool option setup.

System Block Diagram

Exploded View of Assemblies

Main Schematic Diagram - Core Components

2013 LED/LCD TV Engineering Guide

Applicable Models: Mid-end Platform

Lists applicable model series for the mid-end platform.

EPI Interface Overview

EPI (Embedded Point-to-Point Interface) Features

Details EPI features like topology, CDR, bandwidth, and control data.

EPI Interface Merits

Lists benefits of EPI, including reliability, EMI margin, and PCB design.

EPI vs. mini-LVDS Comparison

HF mini-LVDS Specifications

Details signals, connectors, limitations, and demerits of HF mini-LVDS.

EPI Specifications

Details EPI signals, connectors, merits, and demerits.

Detailed EPI vs. mini-LVDS Comparison

Topology Comparison

Compares the topology of HF mini-LVDS and EPI interfaces visually.

Protocol Comparison

Compares the communication protocols used by HF mini-LVDS and EPI.

Features Comparison (10bit, FHD120)

Compares data rates and clock types for both interfaces at 10bit, FHD120.

Merits Comparison

Compares advantages like structure, standardization, and PCB design.

Demerits Comparison

Compares disadvantages like line count, clock skew, and bandwidth limits.

Main PCB for Broadband (LD33B Chassis)

Main PCB with Integrated T-CON

Shows the main PCB layout and identifies key components like processor and T-CON.

Key Component Identification on Main PCB

Identifies major components on the main PCB: processor, micom, PMIC, audio amp, EPI, level shifter.

LGE2122 Chipset Block Diagram

Power Distribution Block Diagram

Tuner and CI Interface Block Diagram

Video and Audio Input Signal Paths

Audio Output Signal Paths

HDMI Interface Connections

Panel Interface (EPI Tx) Block Diagram

PMIC and Level Shift Block Diagram

USB, Wi-Fi, M-Remote, UART Interfaces

Interconnection Diagram - PCBs and Cables (1)

PCB Identification

Identifies main PCBs: Main, Power, Local Key, RF, and WIFI Assy.

Cable Connections (1)

Lists and identifies main cables: Main/LPB, EPI, LED Driver, IR, WIFI.

Interconnection Diagram - PCBs and Cables (2)

PCB Identification (Continued)

Identifies the IR Assy PCB.

Cable Connections (2)

Lists and identifies IR to Local Key and IR to Logo Assy cables.

RF Assembly and Magic Remote Control

System Overview

Provides a general overview of the system's operation.

Remote Button Functions

Details the function of each button on the remote control.

MR13 Block Diagram

Illustrates the internal components and connections of the MR13 remote control.

Component Function List

Lists the primary functions of the remote control's integrated components.

Pairing and Un-pairing Procedures

Explains the steps for establishing and removing the remote's connection.

Remote Control Communication Process

Pairing Information Transmission

Describes data sent during pairing: calibration, FW version, BD_ADDR.

Pairing Sequence Details

Outlines the packet exchange sequence for successful pairing and data transfer.

Motion Data Transmission

Details the period and type of motion data (gyro, accelerometer) transmitted.

Voice Data Transmission

Specifies the period and sampling rate for voice data transmission.

Remote Button Functionality Comparison

MR13 Remote Control Block Diagram

Remote Control Component Functions

Voice Functions

Lists voice codec and MEMS mic. ICs and their functions.

Motion Sensor Functions

Lists gyro sensor and accelerometer ICs and their sensing functions.

RF and Micom Functions

Lists RF antenna, X-tal, and RF+Micom ICs and their functions.

DC-DC Converter Function

Lists DC-DC converter IC and its function as a regulator.

LDO1 Function

Lists LDO1 IC and its function for RF, Gyro, Accelerometer.

LDO2 Function

Lists LDO2 IC and its function for Audio Codec, Mic.

RF Pairing and Un-pairing Procedures

RF Pairing Steps

Details methods for RF pairing and repairing, including IR signals and LED feedback.

RF Unpairing Steps

Explains unpairing, erasing data, and resetting to IR mode.

Wi-Fi Module Introduction

Wi-Fi Module Features

Describes the key features of the built-in Wi-Fi assembly.

Wi-Fi Module Specifications

Lists the technical specifications for the Wi-Fi module.

Wi-Fi Module Block Diagram and Pin Map

Wi-Fi Wafer Details

Shows wafer connections and pin mapping for the Wi-Fi module.

Wi-Fi Pin Map

Maps Wi-Fi module pins to USB interface functions.

Wi-Fi Module Technical Specifications

Content Protection Technologies

Understanding Widevine

Explains Widevine's role in Adaptive Streaming and DRM.

HDCP 2.0 and Netflix

Details HDCP for content protection and Netflix service features.

Understanding DTCP

Defines DTCP protocol for protecting audio/video entertainment content.

Bill of Materials Changes

Highlights changes made to the Bill of Materials.

Widevine Functionality and Key

Widevine Solution Details

Explains Widevine's function and requirement for special CP keys.

Widevine Key Information

Defines the Widevine Key as unique data stored in the TV for Widevine usage.

HDCP 2.0 and Netflix Features

HDCP Overview

Explains HDCP as High-bandwidth Digital Content Protection for digital interfaces.

Benefits of HDCP 2.0

Highlights HDCP 2.0's support for a broader range of wired and wireless interfaces.

DTCP Protocol and Cryptographic Keys

Digital Transmission Content Protection (DTCP)

Defines DTCP protocol for protecting audio/video entertainment content.

DTCP Cryptographic Keys

Explains Authentication, Exchange, and Content Keys used in DTCP for protection.

Standard Repair Process - Error Symptom Guide

Video Error Troubleshooting: No Video/Normal Audio

Video Error Troubleshooting: No Video/No Audio

Video Error Troubleshooting: Picture Broken/Freezing

Video Error Troubleshooting: Tuning Fail/Picture Issues (DVB-S/S2)

Video Error Troubleshooting: Color Error

Video Error Troubleshooting: Bars, Image Issues, Color

Power Error Troubleshooting: No Power

Power Error Troubleshooting: Auto Power Off Issues

Audio Error Troubleshooting: No Audio/Normal Video

Audio Error Troubleshooting: Wrecked Audio/Discontinuation/Noise

General Function Troubleshooting: Remote/Switch Issues

Function Error Troubleshooting: External Device Recognition

Noise Troubleshooting: Circuit and Mechanical Noise

Exterior Defect Troubleshooting

Network Error Troubleshooting

CI+ Compatibility Error Troubleshooting

Standard Repair Process Details (Continued)

Video Error Troubleshooting: White Balance Adjustment

Video Error Troubleshooting: Power Board Voltage Check

Video Error Troubleshooting: TUNER Signal Strength

Video Error Troubleshooting: TV Version Check

Video Error Troubleshooting: Connection Diagram

Video Error Troubleshooting: TUNER Check

Video Error Troubleshooting: Test Patterns

Appendix: EPI Cable or Main Board Exchange (1)

Appendix: EPI Cable or Main Board Exchange (2)

Appendix: LPB (LED Driver) Exchange

Appendix: Module Exchange (1)

Appendix: Module Exchange (2)

Power Error Troubleshooting: Front Display LED Check

Power Error Troubleshooting: ST-BY Voltage Check

Power Error Troubleshooting: Power ON Check

Power Error Troubleshooting: Power Off Mode Check

Audio Error Troubleshooting: Sound Output Setting

Audio Error Troubleshooting: Voltage and Speaker Check

Function Error Troubleshooting: Remote/Key Operation

Function Error Troubleshooting: VCOM Adjustment

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