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LG Flatron W1943SB User Manual

LG Flatron W1943SB
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E-mail: http://www.LGEservice.com/techsup.html
COLOR MONITOR
SERVICE MANUAL
MODEL: W1943SB (W1943SB-PFT.A**NAPH for
LGD TLC1, W1943SB-PFT.A**VAPH for AUO V00
) **Sales Market
CAUTION
BEFORE SERVICING THE UNIT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
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http://www.wjel.net
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LG Flatron W1943SB Specifications

General IconGeneral
BrandLG
ModelFlatron W1943SB
CategoryMonitor
LanguageEnglish

Summary

Precautions and Safety

Safety-Related Components

Critical safety components must be replaced with manufacturer-specified parts to prevent hazards.

Handling LCD Module

Guidelines for safely handling the LCD module to prevent damage and ensure proper mounting.

Electrical Shock Hazard

Warning about electric shock, especially when dealing with high voltage components like the inverter.

Service Operation Safety

Caution to use plastic tools for shock hazard protection during service.

Servicing Precautions

General Servicing Precautions

General guidelines for safely servicing the unit, including power disconnection and high voltage handling.

Electrostatically Sensitive Devices (ES)

Procedures to prevent damage to ES devices from static electricity during handling and repair.

Component Repair and Handling

General Soldering Guidelines

Best practices for soldering, including iron temperature, solder type, and tip maintenance.

IC Removal and Replacement

Step-by-step guide for removing and replacing Integrated Circuits (ICs) on circuit boards.

Transistor Removal and Replacement

Procedures for replacing discrete transistors, including small-signal and power types.

Diode Removal and Replacement

Method for safely removing and replacing diodes, emphasizing polarity and lead bending.

Fuse and Resistor Replacement

Steps for replacing fuses and conventional resistors, noting spacing for component temperature.

Circuit Board Repair Techniques

Circuit Board Foil Repair

Techniques for repairing damaged copper patterns on circuit boards using jumper wires.

Technical Specifications - Timing

Signal Timing Parameters

Detailed timing specifications for video and sync signals across different display modes.

Disassembly Procedures - Exterior

Base Removal

Steps to detach the monitor base, starting with placing it on a flat surface and releasing a button.

Front Cover Removal

Instructions for removing the front cover by pulling it upward after separating latches.

Back Cover Removal

Steps to remove the back cover by placing the monitor face down and disassembling the rear section.

Disassembly Procedures - Internal Components

Key Board and Bezel Removal

Steps to pull out the keyboard from the bezel and then disassemble the bezel itself.

LVDS Cable and Connector Disassembly

Instructions for disconnecting the LVDS cable and removing connectors.

Main Board and Panel Separation

Steps to separate the main board/power board from the panel.

Disassembly Procedures - Stand and Hinge

Rear Cover and Hinge Assembly

Steps to detach the rear cover and hinge assembly.

Hinge and Stand Components

Details on disassembling the hinge and stand components.

Block Diagrams - Main Board Overview

Core Components and Connections

Overview of the main board's functional blocks including Scalar, Flash, Crystal, and power regulators.

Block Diagrams - Power and Inverter Systems

Power Supply Block Diagram

Schematic showing the power conversion stages from AC input to DC outputs like 5V and 14.5V.

Inverter Circuit Block Diagram

Diagram illustrating the inverter's function, including PWM IC, lamp drive, and protection circuits.

Block Diagram Function Descriptions

Video Controller Functionality

Explanation of the Video Controller's role in signal amplification, digital conversion, and pixel clock generation.

Power Supply and Inverter Functions

Description of power distribution, voltage regulation, and inverter operation for backlights.

MICOM Part Explanation

Details on the Microcomputer unit's functions, including sync signal processing and mode control.

LIPS Board Details

LIPS Board Block Diagram

Diagram of the LIPS board showing its functional blocks and operation.

LIPS Operation Description

Explanation of the LIPS board's functional blocks and their roles in power management and stabilization.

EDID Adjustment Procedures

EDID Programming Setup

Configuration steps for parallel port settings required for EDID programming.

EDID Data Writing Process

Procedure for writing EDID data to the monitor using specific software and hardware.

EDID Verification

EDID Data Verification

Checking manufacturer name, model, serial number, and checksum for successful EDID record.

Service Mode Operation

Service Mode Access

Steps to enter the service mode by turning off power and pressing specific buttons.

Service Mode Options

Overview of available service menu options like Auto Color, Aging, and R/G/B adjustments.

Micom Uploading Connection

Diagram showing cable connections for Micom uploading to the monitor.

Troubleshooting Guide

Troubleshooting - No Power

Flowchart to diagnose no power issues, checking AC input, voltage levels, and crystal oscillation.

Troubleshooting - No Raster (LIPS)

Diagnostic steps for no raster/OSD display, checking power board, voltage, and scaler IC.

Troubleshooting - No Raster (MSTAR)

Troubleshooting for no raster/OSD display on MSTAR platform, checking scaler oscillation and sync signals.

Troubleshooting - DPM Issues

Steps to diagnose DPM issues by checking scaler sync signals.

Troubleshooting - Power Issues

Diagnostic flowchart for power problems, checking AC line, voltages, and internal power components.

Troubleshooting - Raster/Lamp Issues

Steps to troubleshoot raster issues when the lamp is off, checking power, signals, and backlight components.

Wiring Diagram

Component Connections Overview

Diagram illustrating the wiring connections between major components of the monitor.

Exploded View Diagram

Component Layout

Visual representation of the monitor's components in an exploded format for identification.

Exploded View Parts List

Component Identification

List of parts with their reference numbers, TPV part numbers, LGE part numbers, and descriptions.

Replacement Parts Lists

Replacement Parts - Main Board Capacitors

List of replacement capacitors for the main board with part numbers and specifications.

Replacement Parts - Main Board Components

List of replacement diodes, ICs, transistors, and resistors for the main board.

Replacement Parts - Main Board Miscellaneous

List of replacement resistors, fuses, and connectors for the main board.

Replacement Parts - Power Board Capacitors

List of replacement capacitors for the power board with part numbers and specifications.

Replacement Parts - Power Board Components

List of replacement diodes, ICs, transistors, and resistors for the power board.

Replacement Parts - Power Board Other

List of replacement resistors, transformers, and connectors for the power board.

Replacement Parts - Miscellaneous Components

List of replacement parts including wire harnesses, fuses, jumper wires, and filters.

Different Parts List - Model Comparison

Comparison of parts between W1943SB and T8RGNFNBMWLFNN models for identifying differences.

Schematic Diagrams

Schematic Diagrams - Scaler and Interface

Schematic showing the scaler's input signals and panel interface connections.

Schematic Diagrams - D-SUB and ICs

Schematic detailing the connections for the D-SUB input port and associated components.

Schematic Diagrams - Main ICs and Controls

Schematic detailing connections for major ICs like Scalar (U401), Flash (U402), and others.

Schematic Diagrams - Panel Interface

Detailed schematic of the CN405 panel connector, showing LVDS and control signal pinouts.

Schematic Diagrams - Voltage Regulators

Schematics for voltage regulators U701-U704 providing 3.3V and 1.8V to the system.

Schematic Diagrams - Power Supply

Detailed schematic of the power supply section, including AC input, filtering, transformer, and output stages.

Schematic Diagrams - Inverter Circuit

Schematic of the inverter circuit, showing its components and connections for driving CCFL lamps.

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