clarion apa450 powers on but no audio

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i got this amp few months back from a guy who has a small store in the flea market and deals with car audio.he told me the unit was window display that failed due to his electrical system fault-something whent wrong and the amp got powered by 24v instead of 12v.as far as i see and test there are no bad power/outputs in the unit and produces rail voltage and all op amps have -and + 15 v . there is no audio out ,operating the switches in all ranges changes nothing
 
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