LG SPH4B-W Service Manual

5-4
Copyright © 2021 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
ONE POINT REPAIR GUIDE
1. How to Duplicate Problem
Wireless rear speaker doesn’t output a sound.
1-1. Solution
Replace SMPS board (No PVDD).
1-2. How to troubleshoot (Countermeasure)
2. How to Duplicate Problem
Wireless rear speaker doesn’t output a sound.
2-1. Solution
Replace AMP board (No 12 V).
2-2. How to troubleshoot (Countermeasure)
2-3. Service hint (Any picture / Remark)
Check LED color of RX BOX.
Try to remate or reset.
Color is yellow? Replace SMPS board.
YES
NO
RIC307
RIC307
RIC308
RIC308
RIC307
RIC308
< AMP board top view >
NO
Replace AMP board.Check 3.3 V.
YES
Replace SMPS board.
14 VA
(RIC308 pin2)
no input.
AMP 12 V
(RIC308 pin4)
no output.
YES
NO

LG SPH4B-W Specifications

General

Brand	LG
Model	SPH4B-W
Category	Speaker System
Language	English