I noticed that my Onkyo stereo receiver started to lose power output in some of the channels. I switched some of the speaker cables to determine that it was certain outputs and not the speakers. Some of the channels do not have any real signal and some have very weak output. How can I determine what is causing this and if it would be inexpensive to repair. My father said it sounds like rectifiers or something like that but I am not familiar with what he meant. I opened it up and see that it appear that each output jack traces back to a seperate power sink and component. The component is glued to the aluminum? heatsink with white (lithium?) compound.
Any advice would be great, otherwise I'll have to toss this out and hope for a new one for xmas.