LG OLED65G2 A Series - User Manual

P/NO : MFL71888124 (2201-REV00)
CHASSIS : E*21G
MODEL : OLED65G2**A
CAUTION
BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
OLED TV
SERVICE MANUAL
Copyright © 2022 LG Electronics Inc. All rights reserved. Only training and service purposes.
Any reproduction, duplication, distribution (including by way of email, facsimile or other electronic means),
publication, modification, copying or transmission of this Service Manual is STRICTLY PROHIBITED unless you
have obtained the prior written consent of the LG Electronics entity from which you received this Service Manual.
The material covered by this prohibition includes, without limitation, any text, graphics or logos in this Service
Manual.

Summary

SERVICING PRECAUTIONS

General Servicing Precautions

Handling Electrostatically Sensitive Devices

Soldering Best Practices

Component Replacement Procedures

Details methods for replacing ICs, transistors, diodes, and fuses in the TV.

BLOCK DIAGRAM

System Power and Signal Flow

Illustrates the power distribution and signal paths within the TV system.

ASSEMBLY; DISASSEMBLY GUIDE

Back Cover Disassembly Steps

Details the initial steps for disassembling the TV back cover, starting with the stand.

Removing Covers and Screws

Describes how to remove wall mount/AV covers and indicator screws before back cover removal.

Separating Back Cover Holders

Explains how to release back cover holders using a plastic scraper.

Lifting and Handling the Back Cover

Details how to lift and handle the back cover safely after separation.

Back Cover Installation

Covers placing and aligning the back cover for assembly and checking alignment.

Securing the Back Cover

Describes pressing holders and tightening screws to secure the back cover.

Reassembling Covers and Stand

Details reattaching wall mount/AV covers, stand, and stand cable cover.

Overview

This document is a service manual for an LG OLED TV, specifically the OLED65G2**A model, which operates on the E*21G chassis. It provides comprehensive information for technicians on servicing, maintaining, and updating the device.

The primary function of this device is to provide a high-quality visual and audio experience as an OLED TV. Its advanced display technology delivers vibrant colors and deep blacks, characteristic of OLED panels. The TV is designed to receive various broadcasting signals, including digital and analog formats, depending on the region of use. It supports multiple input sources, such as HDMI for high-definition video and audio, USB for media playback and service functions, and Ethernet for network connectivity.

Key usage features include its ability to connect to the internet for software updates and potentially smart TV functionalities, although the latter is not explicitly detailed in the provided excerpts. The TV's HDMI inputs support various resolutions and refresh rates, including 4K UHD and even 8K models (though 8K models are noted as not supporting BS8K Digital Channels), indicating its capability to handle modern high-resolution content from external devices like gaming consoles, Blu-ray players, and PCs. The inclusion of multiple HDMI ports (HDMI1, HDMI2, HDMI3, HDMI4) and USB ports (USB1, USB2, USB3) allows for extensive connectivity with various peripherals. Audio output options include a headphone jack and SPDIF (Optical Audio out), providing flexibility for external audio systems.

Maintenance features are a significant focus of this manual, aimed at guiding service personnel. It outlines crucial safety precautions to prevent electrical shock, fire, and other hazards during servicing. Technicians are advised to use an isolation transformer, replace blown fuses with specified types, and maintain proper spacing for high-wattage resistors. Before returning a serviced unit to a customer, an AC leakage current check is mandatory to ensure operational safety.

The manual also details specific servicing precautions, such as always unplugging the AC power cord before working on components, using appropriate high-voltage meters, and avoiding spraying chemicals on assemblies. It emphasizes the importance of handling Electrostatically Sensitive (ES) Devices with care to prevent damage from static electricity, recommending the use of grounded-tip soldering irons and anti-static solder removal devices. Detailed guidelines for soldering and unsoldering components, including ICs, transistors, diodes, fuses, and resistors, are provided to ensure proper repair and replacement. Instructions for circuit board foil repair are also included, addressing situations where copper patterns might be damaged.

Software update procedures are clearly laid out, supporting both USB download and Network Software Update (NSU). For USB updates, the user plugs in a USB drive with update files, and the TV prompts to start the update. For NSU, the TV must be connected to the internet, and updates can be initiated through the "Software Update" menu. The manual describes the process of checking for updates, monitoring progress, and applying the new software, which typically requires a TV restart. It also covers scenarios for canceling updates and how the TV indicates update completion.

The assembly and disassembly guide provides step-by-step instructions for technicians to access internal components. This includes laying the TV on a flat pad, removing the stand cable cover, detaching the stand by loosening screws and pulling out the power cable, and removing wall-mounted and AV covers. Crucially, it details how to remove the back cover by unscrewing 18 indicator screws and carefully separating the holder positions using a plastic scraper to prevent damage. The reassembly process is also covered, emphasizing proper alignment and securing of the back cover and other components. These detailed instructions ensure that technicians can safely and efficiently perform repairs and component replacements.

LG OLED65G2 A Series Specifications