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LG Flatron L1953S Service Manual

LG Flatron L1953S
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 L1953S Specifications

General IconGeneral
Screen Size19 inches
Panel TypeTN
Resolution1280 x 1024
Aspect Ratio5:4
Brightness300 cd/m²
Contrast Ratio700:1
Response Time5 ms
Viewing Angles160° horizontal, 160° vertical
Weight4.2 kg
ConnectivityD-Sub (VGA)
Input ConnectorsD-Sub

Summary

SPECIFICATIONS

LCD CHARACTERISTICS

Details of the LCD panel's physical and electrical properties.

OPTICAL CHARACTERISTICS

Describes viewing angle and luminance specifications.

SIGNAL CHARACTERISTICS

Covers sync signal types and video input signal parameters.

MAXIMUM RESOLUTION

Specifies the maximum display resolution supported.

POWER SUPPLY DETAILS

Details power input requirements and consumption levels.

ENVIRONMENTAL CONDITIONS

Outlines operating temperature and humidity conditions.

DIMENSIONS AND WEIGHT

Provides physical measurements and weight for monitor models.

SAFETY PRECAUTIONS

SAFETY-RELATED COMPONENTS

Highlights critical safety components requiring specific replacement parts.

LCD MODULE HANDLING

Provides guidance on safely handling the LCD module to prevent damage.

ELECTRICAL SHOCK HAZARDS

Alerts to high voltage hazards, especially with CCFL/inverter circuits.

LEAKAGE CURRENT TESTING

Describes a circuit for checking leakage current during servicing.

SERVICING PRECAUTIONS

GENERAL SERVICING GUIDELINES

Standard safety procedures for servicing electronic equipment.

ESD HANDLING PROCEDURES

Methods to prevent damage to sensitive components from static electricity.

COMPONENT REPLACEMENT PROCEDURES

SOLDERING AND UNSOLDERING

Best practices for soldering and unsoldering electronic components.

IC REPLACEMENT STEPS

Step-by-step process for replacing integrated circuits.

TRANSISTOR REPLACEMENT

Procedures for replacing small-signal and power transistors.

DIODE AND FUSE REPLACEMENT

Steps for replacing diodes, fuses, and conventional resistors.

CIRCUIT BOARD REPAIR

COPPER TRACE REPAIR

Guidelines for repairing damaged copper traces on circuit boards.

TIMING CHART

DISASSEMBLY GUIDE

STAND DISASSEMBLY GUIDE

MAIN BLOCK DIAGRAM

POWER BLOCK DIAGRAM

BLOCK DIAGRAM DESCRIPTIONS

VIDEO CONTROLLER PART

Explains the function of the video signal amplification and conversion.

POWER SUPPLY PART

Describes the power supply circuitry and voltage regulation.

MICOM (MICROCOMPUTER) PART

Details the microcontroller unit and its associated memory and control functions.

LIPS BOARD OPERATION

LIPS BOARD OPERATION DESCRIPTION

Explains the operational flow and function of the LIPS board components.

MONITOR ADJUSTMENT PROCEDURE

EDID V1.0 USER MANUAL

Guide for setting up and using the EDID adjustment program.

PORT SETUP PROCEDURE

Steps for configuring the serial port for the adjustment program.

EDID DATA MANAGEMENT

Instructions for reading and writing EDID data using WinEDID.

SERVICE OSD MENU

SVC OSD MENU OPTIONS

Lists and describes the functionalities available within the Service OSD menu.

TROUBLESHOOTING GUIDE

NO POWER (INDICATOR OFF)

Diagnostic steps for when the monitor does not power on.

TROUBLESHOOTING: NO RASTER (LIPS)

NO RASTER (OSD NOT DISPLAYED) - LIPS

Troubleshooting steps for a blank screen with no OSD on LIPS models.

TROUBLESHOOTING: NO RASTER (MSTAR)

NO RASTER (OSD NOT DISPLAYED) - MSTAR

Troubleshooting steps for a blank screen with no OSD on MSTAR models.

TROUBLESHOOTING: DPM ISSUES

TROUBLE IN DPM

Diagnosing issues related to the DPM (Display Power Management) function.

TROUBLESHOOTING: POWER PROBLEMS

POWER CIRCUIT TROUBLESHOOTING

Troubleshooting steps specifically for power-related issues.

TROUBLESHOOTING: RASTER ISSUES

NO RASTER (LAMP OFF)

Steps to troubleshoot when the backlight (raster) is not functioning.

WIRING DIAGRAM

EXPLODED VIEW

EXPLODED VIEW PARTS LIST

REPLACEMENT PARTS LIST

SCHEMATIC DIAGRAMS

SCALER SCHEMATIC

Detailed schematic of the scaler IC and its connections.

POWER & WAFER SCHEMATIC

Schematic details for the power supply and associated components.

INVERTER SCHEMATIC

Schematic diagram of the inverter circuit controlling the backlight.

POWER SCHEMATIC

Schematic diagram of the power supply unit and its components.

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