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LG Flatron L1753S User Manual

LG Flatron L1753S
34 pages
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COLOR MONITOR
SERVICE MANUAL
Website:http://biz.LGservice.com
CAUTION
BEFORE SERVICING THE UNIT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
CHASSIS NO. : LM57A
MODEL: L1753S (L1753S-BFQ.A**MQP,A**DQP)
L1953S (L1953S-BFQ.A**MQP)
*To apply the MSTAR Chip.
( ) **Same model for Service
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LG Flatron L1753S Specifications

General IconGeneral
Screen Size17 inches
Display TypeLCD
Resolution1280 x 1024
Aspect Ratio5:4
Brightness300 cd/m²
Contrast Ratio700:1
Response Time8 ms
Input ConnectorsVGA
Panel TypeTN
Viewing Angle160° (horizontal), 160° (vertical)

Summary

Monitor Specifications Overview

LCD Characteristics

Details of LCD panel specifications like pixel pitch and color depth.

Optical Characteristics

Defines optical properties such as viewing angle and luminance.

Signal and Timing

Covers video input signals and timing chart references.

Maximum Resolution

Specifies the highest display resolution supported by the monitor.

Power Supply Details

Information on AC input, power consumption modes, and LED indicators.

Environmental Operating Conditions

Details operating temperature, humidity, and MTBF for the unit.

Physical Dimensions

Provides monitor dimensions with tilt and swivel adjustments.

Weight Specifications

Lists net and gross weight for different monitor models.

General Safety and Handling Precautions

Safety-Related Components

Highlights critical safety components requiring specific replacement parts for hazard prevention.

Handling LCD Module Safely

Guidelines for safely handling the LCD module and backlight unit during service.

Electric Shock Hazard Warning

Emphasizes caution regarding high voltage, especially with inverter circuits and CCFLs.

Leakage Current Hot Check

Procedure and circuit diagram for checking leakage current in the monitor.

Detailed Servicing Precautions

General Servicing Guidelines

Basic rules and practices for safe and effective servicing of the monitor.

Electrostatic Discharge (ESD) Prevention

Methods to prevent damage to sensitive components from static electricity.

Soldering and Component Replacement Procedures

Soldering and Unsoldering Techniques

Detailed procedures for soldering and unsoldering electronic components safely.

IC Removal and Replacement

Specific steps for removing and installing Integrated Circuits on circuit boards.

Discrete Transistor Handling

Procedure for removing and replacing small-signal transistors, including lead bending.

Power Transistor Replacement

Steps for replacing power output transistors, including heat sink management.

Diode Replacement Procedure

Guidelines for removing and installing diodes, noting polarity and connection methods.

Fuse and Resistor Replacement

Instructions for replacing fuses and conventional resistors, emphasizing spacing.

Circuit Board Repair Techniques

Repairing IC Connection Foil

Method for repairing damaged copper patterns at IC connections using jumper wires.

Repairing Other Connection Foil

Technique for repairing defective copper patterns at non-IC connections with jumper wires.

Video Signal Timing Chart

Monitor Disassembly - Stand Removal

Prepare Work Surface

Placing the monitor on a soft pad for safe disassembly procedures.

Detach Monitor Stand Base

Steps to detach the monitor stand by twisting and pulling specific points.

Separate Monitor Head and Stand

Procedure to separate the main monitor unit from its stand assembly.

Monitor Disassembly - Casing Removal

Remove Mounting Screws

Procedure to remove screws securing the monitor's front and rear casing.

Open Front Cover

Steps to carefully open the front cover and release internal latches.

Remove Rear Cover

Procedure for disassembling the back cover of the monitor to access internal components.

Stand Disassembly - Latch Type 4 Details

Release Bottom Stand Latches

How to release four latches on the stand bottom to separate the body and base.

Restore Stand Latches

Instruction to push stand latches inward for restoration after repair completion.

Stand Disassembly - Latch Type 2 Details

Hold Stand Body Securely

Securing the stand body during disassembly to ensure proper latch release.

Identify and Release Stand Latches

Locating and pushing internal latches to separate the monitor stand components.

Separate Monitor Stand Base

Pushing the base in the opposite direction to detach it from the stand body.

Confirm Stand Separation

Checking that the monitor stand components have been successfully separated.

Main System Block Diagram

Power System Block Diagram

Block Diagram Component Descriptions

Video Controller Functionality

Explains signal amplification, digital conversion, and scaling processes.

Power Supply Unit Breakdown

Details voltage regulators, inverter power, and LCD panel supply circuits.

MICOM Control System

Describes the microcontroller's role, EEPROM storage, and sync signal handling.

LIPS Board Diagram and Operation

LIPS Operation Description

Explains the function of EMI components, rectifiers, transformers, and feedback circuits.

Monitor Adjustment and EDID Configuration

Monitor Port Setup Procedure

Instructions for copying and running UserPort.exe for monitor port setup.

EDID Data Configuration

Steps for reading, editing, and writing EDID data using WinEDID.exe.

Service OSD Menu Access and Options

Service OSD Menu Access

Procedure to access the Service OSD menu by power cycling the monitor.

SVC OSD Menu Options

Lists available service options like Auto Color, NVRAM Init, and Aging mode.

Troubleshooting Guide: No Power Issues

No Power Troubleshooting

Flowchart for diagnosing power issues, checking voltages and key controls.

Troubleshooting Guide: No Raster (LIPS)

No Raster Troubleshooting (LIPS)

Troubleshooting steps for no raster/OSD display related to LIPS power.

Troubleshooting Guide: No Raster (MSTAR)

No Raster Troubleshooting (MSTAR)

Troubleshooting steps for no raster/OSD display related to MSTAR scaler.

Troubleshooting Guide: DPM Functionality

DPM Functionality Troubleshooting

Steps to troubleshoot Digital Power Management (DPM) issues, checking sync pulses.

Troubleshooting Guide: Power Supply Circuit

Power Supply Circuit Troubleshooting

Diagnostic flow for power supply problems, checking fuses, voltages, and waveforms.

Troubleshooting Guide: Raster Display Problems

Raster Display Troubleshooting

Troubleshooting steps for raster display problems, checking power rails and scaler outputs.

Internal Wiring Diagram

Exploded View of Monitor Components

Exploded View Parts List

Replacement Parts: Main Board Components

Main Board Capacitors and ICs

List of capacitors and integrated circuits for the main board with part numbers.

Main Board Transistors and Resistors

Part numbers for transistors and resistors on the main board.

Diodes and Zener Diodes

Replacement parts list for diodes and zener diodes used on the main board.

Replacement Parts: Power Board Components

Power Board Capacitors and ICs

List of capacitors and ICs used on the power board with part numbers.

Power Board Diodes and Transistors

Part numbers for diodes and transistors found on the power board.

Replacement Parts: Resistors and Other Components

Resistors and Miscellaneous Parts

Listing of resistors, transformers, and other miscellaneous components.

Schematic Diagram: Scaler Circuit

Scaler Circuit Schematic

Detailed schematic for the scaler IC (U201) and associated support components.

Schematic Diagram: Power and Wafer Circuitry

Power and Wafer Circuitry Schematic

Schematic of the power supply and wafer components including regulators and connectors.

Schematic Diagram: Inverter Circuit

Inverter Circuit Schematic

Schematic showing the inverter control IC (U301) and lamp drive components.

Schematic Diagram: Power Supply SMPS

Power Supply SMPS Schematic

Detailed schematic of the Switched-Mode Power Supply (SMPS) circuit.

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