LG HT904TA Service Manual page 21

. AMP Protection
"PROTECTION" appears on the FLD.
After unplug power cord, connect again.
Power on.
"PROTECTION"
appears continuously on the FLD.
Is the IC101 pin53
"LOW" signal(0V)?
Is the Q703, Q704 and
Q705 normal?
Replace TI AMP IC(IC0, IC02, IC0, IC0)
YES
YES
YES
YES
YES
YES
NO
NO
NO
Replace the Q703, Q704 and Q705.
2-2
OK.
Replace IC101.