LG Flatron L1515S Service Manual

The LG Flatron L1515S is a 15-inch LCD monitor featuring 1024x768 XGA resolution, 250 cd/m² brightness, 400:1 contrast ratio, analog VGA input, slim bezel design, VESA mount compatibility, power saving mode, and on-screen display controls. This service manual covers technical specifications, disassembly procedures, troubleshooting, circuit diagrams, and maintenance guidelines for qualified service personnel.

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

Product Overview

The LG Flatron L1515S LCD monitor consists of LCD panel, main board, inverter board, power supply, control buttons, and stand assembly.

ComponentDescription
LCD Panel15-inch TFT active matrix
Resolution1024 x 768 (XGA)
Main BoardSignal processing and OSD control
Inverter BoardCCFL backlight power supply
Power SupplyAC/DC conversion
Control ButtonsPower, Menu, Auto, +/-
VGA Input15-pin D-sub connector
StandTilt adjustable base

Technical Specifications

Disassembly Procedures

Follow these steps to disassemble the monitor for service:

  1. Power off and disconnect all cables
  2. Remove stand by pressing release button and pulling upward
  3. Remove rear cover screws (4 pcs)
  4. Separate front bezel from rear case using plastic tools
  5. Disconnect LVDS cable from main board
  6. Remove metal shield screws
  7. Disconnect inverter and power cables
  8. Remove main board and inverter board assembly

WARNING! High voltage present on inverter board. Discharge capacitors before servicing.

Circuit Diagrams

Complete schematic diagrams included for:

Note: Refer to separate schematic sheets for detailed component values and connections.

PCB Layouts

Board layouts showing component placement:

BoardDescription
Main BoardTop and bottom layer views
Power SupplyComponent side and solder side
Inverter BoardTransformer and driver IC placement

All layouts include reference designators matching schematic diagrams.

Troubleshooting Guide

SymptomPossible CauseCorrective Action
No powerFuse, power boardCheck fuse F101; test power board output voltages
No displayInverter, backlightTest inverter output; check CCFL connections
Dim imageBacklight agingReplace CCFL tubes; check inverter output
No OSDMain board, buttonsCheck MCU operation; test control buttons
Color problemsLVDS cable, main boardReseat LVDS cable; check scaler IC
Image distortionMain board, panelTest timing controller; check panel connections

Parts List

Critical replacement parts:

Part NumberDescriptionQty
LGE-1515S-MBMain Board Assembly1
LGE-1515S-PSPower Supply Board1
LGE-1515S-INVInverter Board1
LGE-1515S-PNLLCD Panel Assembly1
LGE-1515S-BZLFront Bezel1
LGE-1515S-STDStand Assembly1

Adjustment Procedures

Factory adjustment settings:

  1. Enter service mode: Power off, hold MENU button, power on
  2. White balance adjustment: Use color analyzer
  3. Geometry adjustment: Test pattern alignment
  4. Backlight adjustment: Luminance measurement
  5. Save settings and exit service mode

CAUTION! Only qualified technicians should perform adjustments.

Safety Precautions

Essential safety guidelines for service personnel:

WARNING! High voltage present in power supply and inverter circuits.

Block Diagram

System block diagram showing signal flow:

Detailed block diagram available in schematic section.

Service Notes

Important service information:

Service Support: Contact LG Service Center for technical assistance and parts ordering.

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