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My audio amp isn't toast....But
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Ed_McCarron:
That toroid is probably a filter, not a transformer.  Seems small for a transformer in the power supply.

You can check a fuse in circuit and under power by looking for voltage ACROSS it.  If you see the power supply voltage across it, its open.

Got a schematic?  Got power?

Get another small amp.  Tie the input grounds together.  Feed audio into the amp under test.  Trace the audio through the circuit until it stops.  The component  before that point is probably bad.

Its a lot of work for something thats fairly easy to replace.  An amp is an amp, no?
Ummon:
I got another amp from somone, but the coupling was way different. I didn't want to hack the harness if I didn't have to. And that ring I mentioned I said was a ferrite ring, so I guess a filter like you were saying.

Anyways, I think it's likely the power supply is bad, which is what I should've concentrated on a long time ago and yanked the ---smurf--- out. Now I've lost my security bit so I have to go get one just to do that. Sheesh.
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