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LG MDD105 Service Manual

LG MDD105
51 pages
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DVD Mini Hi-Fi System
SERVICE MANUAL
MODEL: MDD105 (MDS105V)
CAUTION
BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS”
IN THIS MANUAL.
MODEL: MDD105 (MDS105V)SERVICE MANUAL
P/NO : AFN73972690 JUNE, 2010
Website http://biz.lgservice.com
Internal Use Only
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LG MDD105 Specifications

General IconGeneral
KaraokeYes
Bass reflexNo
Speaker type-
Audio decodersDolby Digital, Dolby Digital 5.1
RMS rated power100 W
Number of speakers2
TypeHome audio mini system
Product colorBlack
Disc loading typeTray
Number of optical discs1 discs
Recording onCD, DVD, USB
Disc types supportedCD-R, CD-RW, DVD+R, DVD+RW, DVD-R, DVD-RW
Playback disc formatsCD audio, SVCD, VCD
Audio formats supportedMP3, WMA
Image formats supportedJPG
Video formats supportedDIVX
AM band range520 - 1720 kHz
FM band range87.5 - 108 MHz
Supported radio bandsFM, MW
Preset stations quantity50
Apple docking compatibilityNot supported
Headphone connectivity3.5 mm
USB 2.0 ports quantity1
Equalizer bands quantity5
Battery typeAAA
Power sourceAC
Cables includedRCA

Summary

SECTION 1 SUMMARY

SERVICING PRECAUTIONS

Notes on handling sensitive components like the pick-up unit during transport and repair.

ESD PRECAUTIONS

Guidelines to prevent static discharge damage to electronic components.

SERVICE INFORMATION FOR EEPROM

Procedure for detecting and editing EEPROM options via remote control.

SOFTWARE UPGRADE PROCESS

Steps for updating the unit's firmware via USB flash drive.

SPECIFICATIONS

Detailed technical specifications for the DVD Mini Hi-Fi System's features and performance.

SECTION 2 CABINET & MAIN CHASSIS

EXPLODED VIEWS

Visual breakdown of the main chassis components for identification.

CABINET AND MAIN FRAME SECTION (MDD105)

Exploded view of the main unit's cabinet and internal frame assembly.

TAPE DECK MECHANISM SECTION

Exploded view of the tape transport mechanism.

SPEAKER SECTION

Exploded view of the speaker assembly.

PACKING ACCESSORY SECTION

Illustration of included accessories and packaging materials.

SECTION 3 ELECTRICAL

ONE POINT REPAIR INSTRUCTION

Troubleshooting guide for common electrical faults and symptoms.

NO POWER PROBLEM

Steps to diagnose and fix issues where the unit does not power on.

VFD DOESN'T DISPLAY

Guidance for troubleshooting when the Vacuum Fluorescent Display is not operational.

THE DISC TRAY DOESN'T WORK

Troubleshooting steps for the disc tray mechanism failing to operate.

DISC TRAY TROUBLESHOOTING (U4, D8)

Specific troubleshooting for disc tray issues involving U4 and D8 components.

DISC TRAY TROUBLESHOOTING (IC401)

Troubleshooting disc tray faults related to IC401 and associated resistors.

DISC TRAY TROUBLESHOOTING (IC1)

Troubleshooting disc tray issues focusing on IC1 and communication resistors.

NO BOOTING WHEN YOU TURN THE UNIT ON

Steps to resolve problems where the unit fails to boot up after power-on.

NO BOOTING TROUBLESHOOTING (IC100)

Troubleshooting 'no booting' issues related to IC100 and its connections.

NO BOOTING TROUBLESHOOTING (X100)

Troubleshooting 'no booting' issues related to the X100 crystal oscillator.

NO BOOTING TROUBLESHOOTING (X101)

Troubleshooting 'no booting' issues related to the X101 crystal oscillator.

SPEAKER NO OUTPUT WHEN YOU TURN THE UNIT ON

Steps to diagnose and fix issues with no speaker output or noise.

SPEAKER NO OUTPUT TROUBLESHOOTING (IC700, IC701)

Troubleshooting speaker output problems related to IC700 and IC701.

VFD HAVEN'T SHOW WHEN YOU TURN THE UNIT ON

Steps to troubleshoot when the VFD display remains blank after power-on.

IC1 MICOM INTERFACE WAVEFORM

Oscilloscope waveforms for IC1 MICOM interface during power on.

IC100 MICOM INTERFACE WAVEFORM

Oscilloscope waveforms for IC100 MICOM interface during normal play.

SLED DRIVE AND MOTOR WAVEFORM

Oscilloscope waveforms for SLED drive and motor signals.

SPINDLE DRIVE AND MOTOR WAVEFORM

Oscilloscope waveforms for spindle drive and motor signals.

RF, FOCUS AND TRACKING ERROR WAVEFORM

Oscilloscope waveforms for RF, Focus Error, and Tracking Error signals.

WIRING DIAGRAM

Schematic illustrating interconnections between PCBs and connectors.

BLOCK DIAGRAM

Overall system block diagram showing component interactions.

SMPS - POWER CIRCUIT DIAGRAM

Detailed circuit diagram of the Switched-Mode Power Supply.

MAIN - DVD MPEG CIRCUIT DIAGRAM

Circuit diagram for the Main board's DVD MPEG processing section.

MAIN - MCU CIRCUIT DIAGRAM

Circuit diagram for the Main board's Microcontroller Unit (MCU).

MAIN - SERVO CIRCUIT DIAGRAM

Circuit diagram for the Main board's Servo control system.

MAIN - D/AC CIRCUIT DIAGRAM

Circuit diagram for the Main board's Digital-to-Analog conversion circuits.

MAIN - AMP CIRCUIT DIAGRAM

Circuit diagram for the Main board's Amplifier circuits.

AUDIO DECK SYSTEM CIRCUIT DIAGRAM

Circuit diagram of the audio deck system.

MIC / USB / KEY / VFD CIRCUIT DIAGRAM

Circuit diagrams for MIC, USB, Key, and VFD boards.

CIRCUIT VOLTAGE CHART

Chart listing test points and their corresponding expected voltages.

MAIN P.C.BOARD (TOP VIEW)

Top view of the Main Printed Circuit Board showing component placement.

MAIN P.C.BOARD (BOTTOM VIEW)

Bottom view of the Main Printed Circuit Board showing solder side.

SMPS P.C.BOARD

Diagram of the Switched-Mode Power Supply Printed Circuit Board.

FRONT P.C.BOARD

Diagram of the Front Printed Circuit Board with controls and display components.

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