LG GX / SPN5-W User Manual

SERVICE MANUAL
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS”
IN THIS MANUAL.
MODEL: GX / SPN5-W
P/NO : AFN30024644 JUNE, 2020
MODEL: GX / SPN5-W
Copyright © 2020 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Wireless Sound Bar
“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 GX / SPN5-W Specifications

General

Brand	LG
Model	GX / SPN5-W
Category	Speaker System
Language	English

Summary

Section 1: Summary

Product Safety Servicing Guidelines

Guidelines for safe servicing of audio products, covering hazard prevention.

Servicing Precautions

Precautions for general servicing, insulation checks, and handling sensitive devices.

Hidden Key Mode

Information on special key combinations for accessing hidden operational modes.

Software Update Guide

Instructions for updating product software via USB or application.

Section 2: Cabinet & Main Chassis

Disassembly Instructions

Step-by-step procedures for disassembling the main unit and subwoofer.

Exploded Views

Diagrams showing assembly breakdown of main unit and subwoofer parts.

Section 3: Electrical

Wiring Diagram

Illustrates the electrical interconnections between components and modules.

Block Diagram

Shows the functional blocks and signal flow within the system.

One Point Repair Guide

Troubleshooting common issues: no booting, no sound, protection errors.

Waveforms of Major Check Points

Expected signal waveforms for critical components during operation.

Circuit Voltage Chart

Expected voltage measurements for various ICs and test points.

Printed Circuit Board Diagrams

Top and bottom views of main, amp, front, USB, and key PCBs.

Section 4: Wireless Subwoofer Part

Wiring Diagram

Electrical connections diagram for the wireless subwoofer unit.

Block Diagram

Illustrates the functional blocks and signal flow of the subwoofer system.

One Point Repair Guide

Troubleshooting common power on and wireless connection issues.

Waveforms of Major Check Points

Expected signal waveforms for critical points in the subwoofer.

Circuit Voltage Chart

Expected voltage measurements for subwoofer ICs and components.

Printed Circuit Board Diagrams

Diagrams of the woofer SMPS & AMP PC board.

Section 5: Wireless Receiver Part (Option)

Wiring Diagram

Electrical connections diagram for the wireless receiver.

Block Diagram

Shows the functional blocks and signal flow of the wireless receiver system.

One Point Repair Guide

Troubleshooting guides for rear speaker no sound issues.

Electrical Troubleshooting Guide

Flowcharts for diagnosing pairing and sound output problems.

Waveforms

Expected signal waveforms for the receiver's audio part (I2S).

Printed Circuit Board Diagrams

Diagrams of wireless receiver SMPS and AMP PC boards.