LG SPH4B-W Service Manual

5-5
Copyright © 2021 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
ONE POINT REPAIR GUIDE
3. How to Duplicate Problem
Wireless rear speaker doesn’t output a sound.
3-1. Solution
Replace AMP board (No 3.3 V).
3-2. How to troubleshoot (Countermeasure)
3-3. Service hint (Any picture / Remark)
RIC307
RIC307
RIC308
RIC308
RIC307
RIC308
< AMP board top view >
NO
Replace AMP board.Check Module or connection.
YES
Replace SMPS board.
5 VA
(RIC307 pin2)
no input.
PWM 3.3 V
(RIC307 pin3)
no output.
YES
NO

LG SPH4B-W Specifications

General

Brand	LG
Model	SPH4B-W
Category	Speaker System
Language	English