LG Flatron W2253TQ Service Manual

The LG Flatron W2253TQ is a 22-inch LCD monitor featuring 1680x1050 resolution, 5ms response time, 300 cd/m² brightness, 1000:1 contrast ratio, D-Sub and DVI-D inputs, HDCP support, tilt adjustment, and power saving features. This service manual provides technical information for service personnel including disassembly instructions, troubleshooting, block diagrams, and replacement procedures.

1. Product Overview 2. Specifications 3. Disassembly Instructions 4. Block Diagrams 5. PCB Layouts 6. Troubleshooting Guide 7. Parts List 8. Adjustment Procedures 9. Safety Precautions 10. Wiring Diagrams 11. Service Information

Product Overview

The LG Flatron W2253TQ monitor consists of LCD panel, main board, power supply board, control board, and stand assembly.

ComponentDescription
LCD Panel22-inch TFT LCD, 1680x1050 resolution
Main BoardSignal processing and control circuitry
Power Supply BoardAC/DC conversion and power distribution
Control BoardFront panel buttons and LED indicators
Backlight InverterCCFL backlight power supply
Stand AssemblyTilt adjustment mechanism
Input ConnectorsD-Sub (VGA) and DVI-D digital input
Power ConnectorExternal power adapter input
OSD ControlsAuto/Source, Menu, +/- buttons
LED IndicatorPower/status indicator

Specifications

Disassembly Instructions

Follow these steps to disassemble the monitor for service.

  1. Remove stand: Press release button and lift monitor from stand.
  2. Remove rear cover: Remove 4 screws and carefully separate rear cover.
  3. Disconnect cables: Disconnect LVDS cable, inverter cables, and control cables.
  4. Remove metal shield: Remove screws holding metal shield.
  5. Access main board: Remove main board mounting screws.
  6. Remove LCD panel: Carefully lift LCD panel assembly.

WARNING! Disconnect power before disassembly. Handle LCD panel with care to avoid damage.

Block Diagrams

System block diagram showing signal flow and power distribution.

PCB Layouts

Detailed PCB layouts for main board and power supply board.

PCBComponentsTest Points
Main BoardScaler IC, memory, voltage regulators3.3V, 5V, 12V test points
Power BoardDC-DC converters, fuse, connectorsInput voltage, backlight enable
Control BoardButtons, LED, microcontrollerKey signals, LED drive
Inverter BoardTransformer, MOSFETs, controller ICBacklight voltage, current sense

Troubleshooting Guide

SymptomPossible CauseCorrective Action
No powerPower adapter, fuse, main boardCheck adapter output, replace fuse, test main board voltages
No displayBacklight, inverter, main boardCheck backlight operation, test inverter output, verify main board signals
Distorted imageLVDS cable, main board, panelReseat LVDS cable, test main board output, check panel
Color problemsMain board, LVDS cable, panelCheck color settings, test LVDS signals, inspect panel
OSD not workingControl board, main boardTest control board buttons, check connection to main board

Parts List

Critical replacement parts for service.

Adjustment Procedures

Factory adjustment procedures for optimal performance.

  1. White balance adjustment: Use color analyzer to adjust RGB gains
  2. Geometry adjustment: Check and adjust image position and size
  3. Backlight uniformity: Verify even backlight illumination
  4. Color temperature: Set to 6500K standard
  5. Gamma correction: Adjust gamma curve for optimal gradation

Note: Special test equipment required for factory adjustments.

Safety Precautions

Important safety information for service personnel.

WARNING! High voltage present in inverter circuit - risk of electric shock.

Wiring Diagrams

Interconnection diagrams for all internal cables and connectors.

ConnectionConnector TypePin Count
Main to Inverter10-pin header10
Main to ControlFlex cable6
Inverter to BacklightCCFL connectors4 (2 per lamp)
Main to LCD PanelLVDS connector30
Power InputDC jack1

Service Information

Technical support and service contact information.

Note: This manual is for qualified service personnel only.

LG Flatron W2253TQ Service Manual © - All Rights Reserved 2025