sorry to hear that. mine it's still in a plastic bag, waiting for a magnifying lamp to put it together. check if do you see some domed capacitors, those are gone. that's how I fixed an lcd monitor. I have found three capacitors with domed top, replaced them and it worked as new. maybe you are lucky. usually semiconductors go out the fastest like transistors, diodes and ICs.
the amp doesn't have some kind of protection if a speaker is not connected?