LG SPH7B-W User Manual

3-23
ONE POINT REPAIR GUIDE
22. D(DC) PROTECTION
22-1. D PROTECTION
22-1-1. Solution
Replace IC700, IC701 (AMP IC) on MAIN board.
22-1-2. How to troubleshoot (Countermeasure)
1) Check DC Voltage of speaker out FL+/-, TWL+/- (CN703 pin1, 2, 3, 4), FR+/-, TWR+/- (CN704 pin1, 2, 4, 5).
2) Check resistor crack, cold solder of PWM IC out (R602, R603, R607, R608, R609, R611, R612, R613).
3) If PWM IC out is ok and speaker out (FL+/-, FR+/-, TWL+/-, TWR+/-) has DC Voltage,
Replace IC700, IC701 (AMP IC) on MAIN bottom board.
22-1-3. Service hint (Any picture / Remark)
< MAIN board bottom view >
< MAIN board top view >
IC701
IC701
IC700
IC700
CN704
CN704
CN703
CN703
R602, R603,
R602, R603,
R607 ~ R609,
R607 ~ R609,
R611 ~ R613
R611 ~ R613

LG SPH7B-W Specifications

General

Brand	LG
Model	SPH7B-W
Category	Speaker System
Language	English