I also have an AV-1. I suspect you might be missing the pair of bridging pins (looks like a shiny u-shaped stubby nail) inserted between the center of the "Pre-Out" and "Main In" rca connectors on the back of the unit. There are two sets, one set of left and right each for the Front and Rear. Without these, you will get no output from the unit.
Hope this helps.
From the initial posting of this question. (Please only update one.)
There is a switching IC inside this unit that may be the problem, but without seeing the actual unit and signal tracing, this will be near impossible to diagnose. If you have an oscilloscope, place an input signal on one of the inputs and trace the signal to the IC. It will be a TA9263 or something similar. You should see the signal on 2,4 or 6 pins. If you see the signal only on 2, then the IC is likely to be defective.
That would be my first attempt. Also check the power supply to that IC.
Keep us posted on progress.
Thanks,
Dan
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