D(Dc) Protection - LG SJ3 Service Manual

7. D(DC) PROTECTION

7-1. Solution
Replace IC703 (AMP IC) on MAIN board.
7-2. How to troubleshoot (Countermeasure)
1) Check DC Voltage of speaker out FL+/- (CN703 pin1, 2), FR+/- (CN704 pin1, 3).
2) Check resistor crack, cold solder of IC501 out (R570 ~ R573).
3) If IC501 out is ok and speaker out (FL+/-, FR+/-) has DC Voltage,
Replace IC703 (AMP IC) on MAIN bottom board.
7-3. Service hint (Any picture / Remark)
IC501 IC501
ONE POINT REPAIR GUIDE
R570 ~ R573 R570 ~ R573
< MAIN board top view >
IC703 IC703
< MAIN board bottom view >
CN704 CN704
3-8
CN703 CN703