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LG FLATRON L1919S Service Manual

LG FLATRON L1919S
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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. : LM57A
MODEL: L1919S (L1919S-SFQ.A**REP,A**XEP,AX**EP)
*To apply the MSTAR Chip.
( ) **Same model for Service
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LG FLATRON L1919S Specifications

General IconGeneral
Screen Size19 inches
Resolution1280 x 1024
Panel TypeTN
Brightness300 cd/m²
Contrast Ratio700:1
Response Time5 ms
Display TypeLCD
Aspect Ratio5:4
Viewing Angle160° (H) / 160° (V)
ConnectivityVGA
Input ConnectorsD-Sub

Summary

PRECAUTIONS

SAFETY-RELATED COMPONENT WARNING

Critical safety components must be replaced with manufacturer's parts to prevent hazards.

LCD MODULE HANDLING CARE

Handle LCD modules with care to prevent damage from ESD, heat, humidity, or liquids.

SERVICING PRECAUTIONS

General Servicing Precautions

Follow safety procedures, unplug power, handle components with care, and use proper tools.

Electrostatic Discharge (ESD) Protection

Minimize static discharge when handling sensitive electronic components to prevent damage.

GENERAL SOLDERING GUIDELINES

IC Component Repair

Procedure for desoldering, removing, and soldering ICs on circuit boards.

Discrete Transistor Repair

Steps for removing and replacing transistors, including lead bending.

Power Transistor Repair

How to remove and replace power output transistors, including heat sink management.

Diode Component Repair

Method for removing and replacing diodes, ensuring proper lead connection and polarity.

Fuse and Resistor Replacement

Steps for replacing fuses and resistors, maintaining component spacing.

CIRCUIT BOARD TRACE REPAIR

IC Connection Trace Repair

Procedure for repairing foil traces at IC connections using jumper wires.

Non-IC Connection Trace Repair

Method for repairing foil traces at non-IC connections using jumper wires.

TIMING CHART

DISASSEMBLY - MONITOR SET

Step 1: Rotate Stand Body

In assembly state, rotate stand body to upper side.

Step 2: Separate Stand

Pull the stand and separate stand from monitor set.

Step 3: Remove Screws

Remove the screws.

Step 4: Separate Front Cover

Pull the front cover upward and separate latches.

Step 5: Disconnect Cable

Disassemble Connector.

DISASSEMBLY - MONITOR STAND

Step 1: Stand Body Rotation

In assembly state, rotate stand body to upper side.

Step 2: Stand Separation

Pull the stand and separate stand from monitor set.

Step 3: Latch Release

Pull four latches each side the on stand body to outside.

Step 4: Stand Orientation Adjustment

Rotate the stand body to reverse of pulling direction.

Step 5: Stand Base Detachment

Pull the stand body and separate the stand body from stand base.

SYSTEM BLOCK DIAGRAM

POWER BLOCK DIAGRAM

BLOCK DIAGRAM DESCRIPTIONS

Video Controller Function

Amplifies video signals, converts analog to digital, and outputs R, G, B signals.

Power Supply Function

Provides regulated power (3.3V, 1.8V) to main board, 12V to inverter, and 5V to panel.

MICOM Controller Function

Includes video controller, EEPROM for data, Reset IC, and Micom for sync distinction.

LIPS BOARD BLOCK DIAGRAM

EMI Components Function

Contains EMI components to comply with global marketing EMI standards.

Input Rectifier & Filter Function

Transfers input AC voltage to DC voltage using a bridge rectifier and capacitor.

Energy Transfer Function

Transfers primary energy to secondary through a power transformer.

Output Rectifier & Filter Function

Stabilizes DC output by controlling duty cycle and monitoring over-power protection.

Photo-Coupler Isolation Function

Provides feedback to the primary controller for stabilized DC output voltage.

Signal Collection Function

Collects DC output changes and feeds back to the primary through a photo transistor.

ADJUSTMENT PROCEDURES

Port Setup Configuration

Steps to copy UserPort.sys and run Userport.exe for port setup.

EDID Data Management

Procedures for running WinEDID.exe to read, write, and edit EDID information.

SERVICE OSD MENU OPERATIONS

OSD Menu Feature Descriptions

Describes features like Auto Color, NVRAM INIT, CLEAR ETI, AGING, R/G/B settings, and MODULE selection.

TROUBLESHOOTING GUIDE

Troubleshooting: No Power

Troubleshooting steps for when the monitor has no power, including checking voltages and components.

Troubleshooting: No Raster (LIPS)

Diagnoses issues where no raster or OSD is displayed on LIPS models.

Troubleshooting: No Raster (MSTAR)

Diagnoses issues where no raster or OSD is displayed on MSTAR models.

Troubleshooting: DPM Issues

Troubleshooting steps for Display Power Management (DPM) issues.

Troubleshooting: Power Supply

Troubleshooting steps related to power supply issues, checking fuses, voltages, and components.

Troubleshooting: Raster Issues

Troubleshooting steps for raster issues, including checking voltages and waveforms.

WIRING DIAGRAM

EXPLODED VIEW

SCHEMATIC DIAGRAMS

Scaler Schematic

Detailed schematic of the scaler section, showing ICs, connections, and components.

Power & Wafer Schematic

Schematic diagram of the power supply and wafer sections.

Inverter Schematic

Schematic diagram of the inverter circuit, showing components for lamp driving.

Power Supply Schematic

Detailed schematic of the power supply circuit, including SMPS components.

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