LG OM4560 Service Manual page 35

PROTECTION
6-3. B(Burnt) Protection
6-3-1. Solution
Replace IC703(AMP IC) on MAIN bottom board.
6-3-2. How to troubleshoot (Countermeasure)
1) After main set power off, check red LED blink at intervals of 0.5 second. (B Protection)
2) Turn main set power on again.
3) Check voltage 3.3 V of AMP_Protect signal (pin2 of Q702).
4) If pin2 of Q702 is low (0 V) , replace IC701(AMP IC) on MAIN top board.
6-3-3. Service hint (Any picture/ Remark)
IC701 (AMP IC) IC701 (AMP IC)
< Main board top view >
ONE POINT REPAIR GUIDE
3-18
Q702 pin2 Q702 pin2
< Main board bottom view >