LG S55A3-D Service Manual

3-10
ONE POINT REPAIR GUIDE
9. B(BURNT) PROTECTION
9-1. Solution
Replace IC703 (AMP IC) on MAIN board.
9-2. How to troubleshoot (Countermeasure)
1) After MAIN SET power off, check Red LED blink at intervals of 0.5 sec. (B Protection)
2) Turn MAIN SET power on again.
3) Check voltage 3.3 V of AMP_PROTECT signal (pin2 of Q701).
4) If pin2 of Q701 is Low (0 V), replace IC703 (AMP IC) on MAIN bottom board.
9-3. Service hint (Any picture / Remark)
< MAIN board top view >
< MAIN board bottom view >
Q701
Q701
Pin2
Pin2
IC703 (AMP IC)
IC703 (AMP IC)

LG S55A3-D Specifications

General

Brand	LG
Model	S55A3-D
Category	Speaker System
Language	English