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LG Flatron L1900J User Manual

LG Flatron L1900J
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COLOR MONITOR
SERVICE MANUAL
Website:http://biz.LGservice.com
E-mail:http://www.LGEservice.com/techsup.html
CAUTION
BEFORE SERVICING THE UNIT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
CHASSIS NO. : LM62A
MODEL: L1900J (L1900J-BFQ.A**TNP)
*To apply the MSTAR Chip.
( ) **Same model for Service
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LG Flatron L1900J Specifications

General IconGeneral
Screen Size19 inches
Display TypeLCD
Resolution1280 x 1024
Aspect Ratio5:4
Brightness250 cd/m²
Contrast Ratio700:1
Response Time5 ms
Viewing Angles160° horizontal, 160° vertical
ConnectivityVGA, DVI-D
Panel TypeTN
Power Consumption (standby)1 W
Input ConnectorsDVI, VGA
Viewing Angle160° horizontal, 160° vertical

Summary

SPECIFICATIONS

1. LCD CHARACTERISTICS

Technical specifications for the LCD panel, including type, size, and interface.

2. OPTICAL CHARACTERISTICS

Details on visual performance metrics like viewing angle and contrast ratio.

3. SIGNAL

Information on input signal types, voltage levels, and impedance.

4. Max. Resolution

Supported maximum display resolutions for analog and digital inputs.

5. POWER SUPPLY

Specifications for the power input, voltage, and consumption.

6. ENVIRONMENT

Operating conditions including temperature and humidity ranges.

7. DIMENSIONS (with TILT/SWIVEL)

Physical dimensions of the monitor with stand adjustments.

8. WEIGHT (with TILT/SWIVEL)

Weight specifications of the monitor with stand.

SERVICING PRECAUTIONS

General Servicing Precautions

General guidelines for safe and effective repair procedures.

Electrostatically Sensitive (ES) Devices

Procedures for handling components sensitive to static electricity.

General Soldering Guidelines

Best practices for soldering and unsoldering components.

IC Remove/Replacement

Steps for removing and installing integrated circuits.

Small-Signal Discrete Transistor Removal/Replacement

Methods for handling discrete transistors.

Power Output Transistor Device Removal/Replacement

Procedures for replacing power transistors.

Diode Removal/Replacement

Techniques for replacing diodes.

Fuse and Conventional Resistor Removal/Replacement

Steps for replacing fuses and resistors.

Circuit Board Foil Repair

Techniques for repairing damaged printed circuit board traces.

TIMING CHART

DISASSEMBLY

BLOCK DIAGRAM

DESCRIPTION OF BLOCK DIAGRAM

Explanation of the overall system architecture.

Video Controller Part

Details on signal processing and scaling.

Power Part

Description of the power supply circuitry.

MICOM Part

Functionality of the microcontroller and memory.

Adapter Board Block Diagram

1. EMI components.

Filtering for electromagnetic interference.

2. Input rectifier and filter.

AC to DC conversion process.

3. Energy Transfer.

Power transfer via transformer.

4. Output rectifier and filter.

Stabilizing the DC output.

5. Photo-Coupler isolation.

Feedback mechanism for voltage regulation.

6. Signal collection.

Feedback for primary control.

ADJUSTMENT

1. Port Setup

Configuring communication ports for software.

2. EDID Read & Write

Managing Extended Display Identification Data.

SERVICE OSD

1. LPT port Seting

Selecting the parallel port for communication.

2. Jig to use

Using the specific connection jig.

3. ABUS Commander

Using the commander interface for adjustments.

TROUBLESHOOTING GUIDE

1. NO POWER

Diagnosing and fixing power issues.

2. NO RASTER (OSD IS NOT DISPLAYED) – INVERTER

Troubleshooting display issues related to the inverter.

3. NO RASTER (OSD IS NOT DISPLAYED) – MSTAR

Troubleshooting display issues related to the MSTAR chip.

4. TROUBLE IN DPM

Diagnosing Dynamic Power Management issues.

WIRING DIAGRAM

EXPLODED VIEW

EXPLODED VIEW PARTS LIST

Identification of monitor components by number.

REPLACEMENT PARTS LIST

SCHEMATIC DIAGRAM

1. SCALER

Schematic of the video scaling circuitry.

2. POWER

Schematic of the main power supply unit.

3. CONNECTOR

Schematics detailing various interface connectors.

4. J-Type LED

Schematic for the J-Type LED backlighting system.

5. POWER

Schematic for a specific power sub-circuit.

6. LED Bright control

Schematic for controlling LED brightness.

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