LG SH93SA-S Service Manual page 20

6. AMP Protection
"PROTECTION" appears on the FLD.
After unplug power cord, connect again.
Power on.
"PROTECTION"
appears continuously on the FLD.
Is the IC101 pin54
"LOW" signal(0V)?
Is the Q703, Q704 and Q705 normal?
Replace TI AMP IC(IC701, IC702, IC703, IC704)
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Only for training and service purposes
YES
YES
YES
YES
YES
YES
NO
NO
NO
Replace the Q703, Q704 and Q705.
2-11
OK.
Replace IC101.
LGE Internal Use Only