LG HT552TH - DVD & Amp Part Electrical Troubleshooting Guide; Section 3. DVD & Amp Part

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ELECTRICAL TROUBLESHOOTING GUIDE
SECTION 3. DVD & AMP PART
1. AMP PROTECTION
"PROTECTION" appears on the FLD.
Power on.
Replace TI AMP IC(IC701~704).
"PROTECTION"
appears continuously on the FLD.
Is the IC101 pin64
"LOW" signal(0V)?
Is the Q703, Q704 and 705 normal?
After unplug power cord, connect again.
OK.
Replace IC101.
Replace the Q703, Q704 and Q705.
No
No
No
Yes
Yes
Yes