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LG 27GL850 User Manual

LG 27GL850
33 pages
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P/NO :
CHASSIS :
MODEL :
CAUTION
BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
SERVICE MANUAL
Copyright © 2019 LG Electronics Inc. All rights reserved. Only training and service purposes.
CONFIDENTIAL
P/NO : MFL70211519 (1906-REV00)
LED MONITOR
SERVICE MANUAL
LM61C
27GL850 27GL850-BB
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.
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LG 27GL850 Specifications

General IconGeneral
Screen Size27 inches
Resolution2560 x 1440 (QHD)
Panel TypeIPS
Refresh Rate144Hz
Response Time1ms (GtG)
Aspect Ratio16:9
Brightness350 cd/m²
Contrast Ratio1000:1
Color Support1.07 billion colors
Adaptive SyncNVIDIA G-Sync Compatible, AMD FreeSync
Color GamutDCI-P3 98%
HDRHDR10
VESA Mount100 x 100 mm
Viewing Angle178° (H)/178° (V)
ConnectivityHDMI, DisplayPort, USB 3.0
Ports2 x HDMI, 1 x DisplayPort, 2 x USB 3.0, 1 x Headphone Out
Weight6.1 kg (with stand)

Summary

Safety Precautions

Important Safety Notice

Describes special safety parts and modification.

General Guidance

Provides general advice for servicing.

Leakage Current Checks

Explains how to perform cold and hot leakage current tests.

Specifications

General Specification

Details product specifications like model, features, and components.

Signal Timing

H/V Timing Parameters

Details horizontal and vertical timing parameters for various resolutions.

Block Diagram

27GL850 Component Layout

Illustrates the main components and their interconnections.

Exploded View

Part Identification

Visual representation of parts with reference numbers for identification.

Disassembly Procedures

Stand Assembly Separation

Instructions for detaching the monitor stand.

Back Cover Assembly

Steps for removing the rear casing of the monitor.

Cabinet Disassembly

Component Removal

Details on removing internal components and the main cabinet.

Troubleshooting - No Power

No Power Issues

Step-by-step guide to diagnose and resolve power-related issues.

Troubleshooting - Screen Issues

No Screen Issues

Guide for diagnosing and fixing issues where the screen remains blank.

Troubleshooting - HDMI Video

No Video - HDMI Issues

Steps to troubleshoot video signal loss over HDMI connection.

Troubleshooting - DisplayPort Video

No Video - DP Issues

Steps to troubleshoot video signal loss over DisplayPort connection.

Adjustment Specification Overview

LM61C Adjustment Details

Specific adjustment details for the LM61C chassis.

Adjustment Specification Revisions

Revision History

Records of changes and updates to the adjustment specifications.

Adjustment Specification Contents

Document Structure

Overview of the sections covered in the adjustment specification document.

Adjustment Procedures - Part 1

Application and Designation

Details scope, applicability, and order for adjustments.

Main PCB Check Process

Covers procedures for checking and testing the main printed circuit board.

Adjustment Procedures - Part 2

Assembly Line Processes

Procedures for EDID, HDCP, and Gamma calibration during assembly.

Final Checks and Conditions

DPM Operation Check

Details checks for Dynamic Power Management operation.

Shipping Condition

Specifies requirements for product shipping and final checks.

Outgoing Condition Settings

Game and Picture Adjustments

Settings related to game modes and picture quality adjustments.

Signal Composition and Commands

I2C Communication

Details I2C communication protocols and commands for adjustments.

Screen Adjust Commands

Lists specific commands for screen adjustments and calibration.

EEPROM Operations - Part 1

EEPROM Data Write

Details commands and procedures for writing data to EEPROM.

EEPROM Operations - Part 2

EEPROM Command Set

Lists specific commands for EEPROM operations.

EEPROM Data Read

Details procedures for reading data from EEPROM.

EDID Operations

EDID Write

Instructions for writing Extended Display Identification Data.

EDID Read

Instructions for reading Extended Display Identification Data.

Input Port Schematics

HDMI and DisplayPort Circuits

Circuit diagrams for HDMI and DisplayPort input connectors.

Power Supply Schematics - Part 1

Main IC Power Lines

Schematic showing power line capacitors for the main IC.

Power Supply Schematics - Part 2

Main IC Power Line Details

Detailed schematic of power distribution and filtering for main ICs.

Power Supply Schematics - Part 3

Power Supply Regulators

Circuit diagrams for DC jack input, panel voltage, and power supply regulators.

Audio Schematics

Headphone Amplifier Circuit

Circuit diagrams for the headphone amplifier and output jack.

LED Driver Schematics

LED Backlight Drivers

Circuit diagrams for the LED backlight driver ICs.

System Component Schematics - Part 1

USB Hub Circuit

Circuit diagrams for the USB hub and its power management.

System Component Schematics - Part 2

Scaler and I2C Master Circuits

Diagrams for the scaler IC and I2C master controller.

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