LG DM5420K User Manual

KARAOKE DVD Mini Hi-Fi System
SERVICE MANUAL
MODEL: DM5420K
(DM5420K, DMS5420V)
CAUTION
BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS”
IN THIS MANUAL.
MODEL: DM5420K (DM5420K, DMS5420V)SERVICE MANUAL
P/NO : AFN75814472 JULY, 2012
Website http://biz.lgservice.com
Internal Use Only

LG DM5420K Specifications

General

Bluetooth	Yes
CD Player	Yes
USB Playback	Yes
FM Tuner	Yes
Playable Media	CD, USB
Audio Formats	MP3, WMA
USB Port	Yes
Audio Line-in	Yes
Speaker Type	2-Way

Summary

System Overview and Safety

Servicing Precautions

Safety and handling guidelines for servicing the karaoke DVD system.

ESD Precautions for Component Handling

Procedures to prevent electrostatic discharge damage to sensitive electronic components.

EEPROM Service Information Access

Steps to display EEPROM information using the remote control and TV display.

Firmware Update Guide

Instructions for updating the system's MICOM and DVD programs via USB.

Technical Specifications

Detailed electrical and physical specifications of the karaoke DVD system.

Chassis, Cabinet, and Accessories

Exploded Views Overview

Visual breakdowns of the unit's internal and external component assemblies.

Cabinet and Main Frame Assembly

Detailed illustration of the unit's main chassis and frame components.

Packaging and Accessory Contents

List and visual representation of included accessories and packaging materials.

Speaker Unit Details

Exploded view and identification of the front speaker system components.

Electrical System Diagnostics and Schematics

Electrical Troubleshooting Procedures

Step-by-step guide for diagnosing and resolving common electrical malfunctions.

Key Signal Waveform Analysis

Examples of expected oscilloscope waveforms for critical system signals.

SMPS Circuit Schematic

Detailed circuit diagram for the Switched-Mode Power Supply (SMPS) section.

SMPS Printed Circuit Board Layout

Component placement diagram for the SMPS Printed Circuit Board (PCB).