LG RN7 User Manual

SERVICE MANUAL
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS”
IN THIS MANUAL.
MODEL: RN7
P/NO : AFN30014624 MARCH, 2020
MODEL: RN7
Copyright © 2020 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Mini Hi-Fi Audio
“Any reproduction, duplication, distribution (including by way of email, facsimile or other
electronic means), publication, modification, copying or transmission of this Service Manual is
STRICTLY PROHIBITED unless you have obtained the prior written consent of the LG Electronics
entity from which you received this Service Manual. The material covered by this prohibition includes,
without limitation, any text, graphics or logos in this Service Manual.”

LG RN7 Specifications

General

Connectivity	Bluetooth
FM Radio	Yes
Multi Bluetooth Pairing	Yes
Features	DJ Effects
Inputs	USB

Summary

SECTION 1 GENERAL

Product Safety Servicing Guidelines

Guidelines for safe servicing of audio products, including important notices and graphic symbols.

Servicing Precautions and ESD Control

General precautions for servicing, insulation checks, and handling of electrostatic sensitive devices.

Hidden Key Mode Operations

Details on accessing and using hidden key modes for version checks and EEPROM initialization.

Program Download Procedures

Guides for downloading Main MCS, MICOM, and Option/EQ programs via USB.

FOTA Update via Bluetooth App

Step-by-step instructions for updating firmware over-the-air using the Bluetooth application.

Product Specifications

Technical specifications including general, inputs, tuner, and system details.

SECTION 2 CABINET & MAIN CHASSIS

Disassembly Instructions

Detailed steps for disassembling the unit's cabinet and main chassis components.

FFC Cable Insertion Guide

Instructions for correct insertion of Flexible Flat Cables (FFC) into connectors.

Exploded Views: Cabinet and Frame Section

Visual breakdown of cabinet and main frame parts with assembly references.

Packing Accessory Section

Illustration and list of packing accessories included with the product.

SECTION 3 ELECTRICAL

One Point Repair Guide

Troubleshooting common issues like no power, no booting, and display problems.

Electrical Troubleshooting Guide

Flowcharts for diagnosing power, MCS, PWM, amplifier, tuner, USB, and Bluetooth functions.

Waveforms of Major Check Points

Visual representations of signal waveforms for DSP, SDRAM, Servo, Motor Driver, ADC, USB, and Bluetooth.

Wiring Diagram

Diagram illustrating the interconnection of major components and modules.

Block Diagram

Functional block diagram showing the overall system architecture and data flow.

Circuit Voltage Charts

Reference voltages for ICs, capacitors, and connectors to aid in troubleshooting.

Printed Circuit Board Diagrams

Layout diagrams for SMPS, Main, Top Key, Lighting LED, and DAB Module PCBs.