LG SN4A User Manual

SERVICE MANUAL
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS”
IN THIS MANUAL.
MODEL: SN4A(SN4A, SPN4BM-W)
P/NO : AFN30064620 JULY, 2021
MODEL: SN4A
(SN4A, SPN4BM-W)
Copyright © 2021 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 SN4A Specifications

General

Total Power	300W
Channels	2.1
Subwoofer	Wireless
Wireless Connectivity	Bluetooth 4.0
USB Port	Yes
Remote Control	Yes
Connectivity	Optical
Sound Modes	Standard
Audio formats	Dolby Digital, DTS

Summary

SECTION 1 SUMMARY

PRODUCT SAFETY SERVICING GUIDELINES FOR AUDIO PRODUCTS

Guidelines for safe servicing of audio products, including precautions and tips.

SERVICING PRECAUTIONS

Precautions to be taken before and during servicing, including ES device handling.

SECTION 2 CABINET & MAIN CHASSIS

DISASSEMBLY INSTRUCTIONS

SECTION 3 ELECTRICAL

ELECTRICAL TROUBLESHOOTING GUIDE

Flowcharts for diagnosing electrical problems related to power circuits.

CIRCUIT VOLTAGE CHART

Table listing ICs, their pins, specifications, and measured voltages.

SECTION 4 WIRELESS SUBWOOFER PART

ONE POINT REPAIR GUIDE

Troubleshooting common problems specific to the wireless subwoofer.

WAVEFORMS OF MAJOR CHECK POINT

PRINTED CIRCUIT BOARD DIAGRAMS