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LG MDT505 Service Manual

LG MDT505
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MINI HOME THEATER
SERVICE MANUAL
MODEL:
MDT505 (MDS505V/W)
CAUTION
BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS”
IN THIS MANUAL.
MODEL: MDT505(MDS505V/W)SERVICE MANUAL
0102,SEPTEMBER21827947NFA:ON/P
Website http://biz.lgservice.com
Internal Use Only

Other manuals for LG MDT505

Questions and Answers:

LG MDT505 Specifications

General IconGeneral
BrandLG
ModelMDT505
CategoryStereo System
LanguageEnglish

Summary

MINI HOME THEATER SERVICE MANUAL

Model Identification and Safety Precautions

Identifies model MDT505 and advises reading safety precautions.

SECTION 1. GENERAL SERVICING PRECAUTIONS

Pick-up Handling and Repair Notes

Guidelines for safe handling and repair of the pick-up unit.

COMPACT DISC PLAYER REPAIR GUIDELINES

ESD PRECAUTIONS AND SYMBOLS

Handling Electrostatically Sensitive Devices (ESD)

Techniques to prevent damage from static electricity to components.

EEPROM SERVICE INFORMATION

EEPROM Update Procedure

Steps to update EEPROM settings via remote control.

FIRMWARE UPDATE PROCEDURES

SECTION 2 CABINET & MAIN CHASSIS

SECTION 3 ELECTRICAL

Electrical Troubleshooting Guide

Comprehensive guide for diagnosing and resolving electrical issues.

System Test and Waveforms

Details system test procedures and signal waveforms for debugging.

Wiring, Block, and Circuit Diagrams

Schematics and diagrams showing system interconnections and circuits.

ELECTRICAL TROUBLESHOOTING GUIDE

SMPS Board Troubleshooting

Diagnostic steps for the Switch Mode Power Supply board.

No Audio Troubleshooting

Steps to diagnose and resolve issues with no sound output.

Front Board Troubleshooting

Diagnostic steps for the front panel board.

No Audio Check Flow

Flowchart for diagnosing no audio issues across functions.

No Video Check Flow

Diagnostic steps for no video output issues.

SYSTEM OPERATION FLOW

Power On and Disc Handling Sequence

Flowchart detailing power-on and disc insertion/ejection.

TEST AND DEBUG FLOW

Power and Voltage Verification

Steps for testing power supply and DC voltage outputs.

SLED and Lens Movement Troubleshooting

Steps for diagnosing SLED and optical lens movement issues.

Laser and Disc Reading Checks

Procedures for verifying laser operation and disc type.

Focus and Tracking Signal Verification

Steps to check focus and tracking signals for disc playback.

Audio Output and Data Stream Verification

Final checks for audio output and data stream integrity.

SYSTEM TEST AND WAVEFORMS

Clock, Reset, and Flash R/W Signals

Waveforms for system clock, reset, and Flash read/write signals.

SERVO OPEN/CLOSE SIGNAL WAVEFORMS

SLED CONTROL SIGNAL WAVEFORMS

LENS AND LASER CONTROL SIGNALS

DISC TYPE JUDGEMENT WAVEFORMS

FOCUS CONTROL SIGNAL WAVEFORMS

SPINDLE CONTROL SIGNAL WAVEFORMS

TRACKING CONTROL SIGNAL WAVEFORMS

WIRING DIAGRAM

Component Interconnection Diagram

Diagram showing connections between major PCBs and modules.

CIRCUIT DIAGRAMS

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