LG SPK8-W Service Manual

3-12
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
ONE POINT REPAIR GUIDE
3. PROTECTION ERROR
No display or No Sound.
3-1. D(DC) PROTECTION
3-1-1. Solution
Replace MAIN board.
3-1-2. How to troubleshoot (Countermeasure)
1) Check DC voltage of speaker out FL+, FL-, TOP L+, TOP L-, SR L+, SR L+ (CN700 pin6, 5, 4, 3, 2, 1),
Center+, Center- (CN701 pin2, 1) and SR L+, SR L-, TOP R+, TOP R-, FR R+, FR R- (CN702 pin8, 7, 5,
4, 2, 1).
2) Check resistor crack, cold solder of AMP IC out (R718, R723, R724, R719, R7L9, R7L8, R7M1, R7M0,
R722, R720, R7L5, R7H1, R7K9, R7H9).
3) If AMP IC out is ok and speaker out has DC voltage, replace MAIN board.
3-1-3. Service hint (Any picture / Remark)
< MAIN board top view >
CN702
CN702
CN701
CN701
CN700
CN700

LG SPK8-W Specifications

General

Brand	LG
Model	SPK8-W
Category	Speaker System
Language	English