birtyA2
A2OC Donor
So your results suggest that the amp is receiving power and that the standby signal is being correctly supplied by the head unit so does very much look like the amp is faulty. I have never had one apart but I suspect that there is a single power amp on a chip in there plus some decoupling capacitors. As with all electronics of this age there may be some dry joints going on but for speed, changing with a replacement unit is the way to go IMHO
J
J