LG Flatron L1811S Service Manual
LG Flatron L1811S Service Manual

LG Flatron L1811S Service Manual

Chassis no. : cl-43

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COLOR MONITOR

SERVICE MANUAL

CHASSIS NO. :
CL-43
FACTORY MODEL:
MODEL:
CAUTION
BEFORE SERVICING THE UNIT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
L1811S
L1811SG
L1811S
(L1811SG-VL)

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Summarization of Contents

SPECIFICATIONS
LCD CHARACTERISTICS
Details the type, size, pixel pitch, color depth, and interface of the LCD panel.
OPTICAL CHARACTERISTICS
Covers viewing angle, luminance, and contrast ratio for optimal visual performance.
SIGNAL CHARACTERISTICS
Specifies sync signal types and video input signal characteristics, including frequency.
MAXIMUM RESOLUTION
Defines the maximum supported display resolution and refresh rate.
POWER SUPPLY SPECIFICATIONS
Details the power supply specifications including input voltage and consumption modes.
ENVIRONMENTAL SPECIFICATIONS
Outlines operating temperature, humidity, and MTBF for the monitor.
DIMENSIONS AND WEIGHT
Provides physical dimensions and weight of the monitor with its stand.
SAFETY PRECAUTIONS
SAFETY-RELATED COMPONENTS
Highlights critical safety components requiring specific replacement parts to prevent hazards.
HANDLING LCD MODULE
Provides guidelines for safely handling the LCD module, emphasizing ESD protection and environmental conditions.
ELECTRIC SHOCK WARNING
Warns about electric shock hazards, especially when working with the inverter circuit or backlight.
TOOL USAGE CAUTION
Advises using plastic tools to prevent electric shock during service operations.
OPERATING INSTRUCTIONS
MONITOR VIEWS AND CONTROL PANEL
Illustrates monitor views and describes front control panel buttons and indicators.
AUTO ADJUSTMENT FUNCTION
Explains the automatic adjustment function for screen position, clock, and phase.
DESCRIPTION OF BLOCK DIAGRAM
VIDEO CONTROLLER AND TRANSMITTER
Explains the video signal processing, conversion, and transmission functions.
POWER PART DESCRIPTION
Details the power supply conversion and distribution for the monitor's components.
POWER BOARD OPERATIONS
POWER BOARD BLOCK DIAGRAM
Visualizes the functional blocks of the monitor's power board, from input to output.
POWER CIRCUIT OPERATION
Explains the function of each part within the power board, including EMI, rectification, and isolation.
ADJUSTMENT PROCEDURES
GENERAL ADJUSTMENT GUIDELINES
General guidelines for monitor adjustment, including prerequisites and warming-up time.
STARTING ADJUSTMENT
Steps to initiate the alignment program and reset data to default states.
WHITE BALANCE CALIBRATION
Procedures for calibrating white balance using BIAS and GAIN calibration commands.
EDID DATA ADJUSTMENT
Instructions for writing EDID data to resolve potential display compatibility issues.
CABLE CONNECTION FOR ADJUSTMENT
Illustrates the necessary cable connections for performing monitor adjustments.
NO POWER TROUBLESHOOTING
NO POWER DIAGNOSIS
Diagnostic flowchart for troubleshooting issues where the monitor does not power on.
NO RASTER TROUBLESHOOTING
NO RASTER DIAGNOSIS
Flowchart for diagnosing problems related to the absence of a display raster.
CLOCK AND DPM TROUBLESHOOTING
NO CLOCK (CLOCK GENERATOR)
Steps to diagnose issues with the clock generator circuit, specifically no dot clock.
DPM MODE TROUBLESHOOTING
Troubleshooting flowchart for issues related to the DPM (Display Power Management) mode.
MAIN BOARD PCB LAYOUT
MAIN BOARD COMPONENT LAYOUT
Diagram showing the component placement on the main PCB.
ADDITIONAL PCB LAYOUTS
POWER BOARD LAYOUTS
Component layouts for the power board (component and solder sides).
CONTROL BOARD LAYOUT
Component layout for the control board, detailing component placement.
REPLACEMENT PARTS LIST (CAPACITORS, DIODES, ICs)
CAPACITORS
Lists replacement part numbers and specifications for various capacitors.
DIODES
Lists replacement part numbers and specifications for diodes.
INTEGRATED CIRCUITS (ICs)
Lists replacement part numbers and specifications for integrated circuits.
REPLACEMENT PARTS LIST (CONTINUED - RESISTORS, COILS, TRANSISTORS)
COILS AND CORES
Lists replacement part numbers and specifications for coils and cores.
TRANSISTORS
Lists replacement part numbers and specifications for transistors.
RESISTORS
Lists replacement part numbers and specifications for resistors.
REPLACEMENT PARTS LIST (CONTINUED - POWER & CONTROL BOARD)
POWER BOARD PARTS
Lists replacement parts for the power board, including capacitors and fuses.
CONTROL BOARD PARTS
Lists replacement parts for the control board, including switches and capacitors.
SCHEMATIC DIAGRAMS
GM2121 INTEGRATED CIRCUIT SCHEMATIC
Detailed schematic of the GM2121 integrated circuit and its surrounding components.
L1811SG POWER CIRCUIT SCHEMATIC
Schematic diagram detailing the internal power circuit of the L1811SG monitor.
L1811SG CONNECTOR SCHEMATIC
Schematic illustrating the wiring and connections of various connectors on the L1811SG monitor.
CONTROL AND POWER SCHEMATIC
Schematic diagram for the control and power interface, including switch functions.
LB886F INTERNAL POWER CIRCUIT SCHEMATIC
Detailed schematic of the LB886F internal power circuit, showing component interconnections.

Table of Contents