LG CM2760 Service Manual page 22

PROTECTION
4-3. B(BURNT) PROTECTION
4-3-1. Solution
Replace IC301(AMP IC) on MAIN board.
4-3-2. How to troubleshoot (Countermeasure)
1) Press the power button, the display is normal, no sound output. (B Protection)
2) Check Voltage 3.3 V of AMP_Protect signal. (collector Q303)
3) If collector Q303 is low(0 V), Replace IC301(AMP IC) on MAIN board.
4-3-3. Service hint (Any picture/ Remark)
ONE POINT REPAIR GUIDE
< MAIN board top view >
Q303 Q303
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