lost one channel on an old Onkyo amplifier (2023 Update)

I have an old and extremely heavy Onkyo stereo amplifier that I use in the basement in my workroom. I bought it years ago at a thrift shop and it's worked well for years.

Now only one channel works. I've tried it on A and B speakers and mono, doesn't matter. Sound comes out of only one side.

Is there anything simple this is likely to be, or is it time to set it out by the curb? (in my neighborhood nothing makes it to garbage day)

There was a thunderstorm and power outage this week, but I'm not sure if it failed before or after.

I've fixed my 5 channel Onkyo amplifier years ago; It was just cracked solder joints between the RCA connectors and the circuit board. I would suspect in your case that you may have a failed transistor or two. You have the other channel to compare the reading too. Remove the power transistors (mounted on heat sinks) and check them with an DMM on diode check, then compare them to the pair from the working side. It is probably worth the effort since Onkyo has a good name for mid quality Hi-Fi equipment. Then look on the internet for replacements or Substitutes and get a matched pair.

Shaun

Just don't get bit by the intermittent fuse. I got bit 2x. Test fuse with ohmmeter. Fine. Put fuse in circuit. Circuit doesn't work. Test voltage across fuse-120V What? Had schematics.

Fuse was bad.

Device was a Decwriter II 300 baud hard copy computer terminal. We had changed most of these fuses to circuit breakers.

Only a m5160 other than what I've wrote to the military why would a amp play on both yet not just one both channels work just not at the same time simultaneously.. bull shit

I've had two Onkyo receivers in the past. Strange things happened with them such as FM not working, one or the other channel would go out. In each case I put the receiver on a shelf and bought another. The first time it happened I had replaced the Onkyo with a newer Onkyo. After a while the new Onkyo flaked out and I bought a Denon. Then for some reason I connected the original Onkyo up and everything worked. After a while I tried the same thing with the second Onkyo and it also worked. My conclusion is that if you unplug the Onkyo and leave to so for several days it heals itself.

YMMV

Since you're replying to a NINE-YEAR-OLD posting, I'd bet the OP's problem is now solved.

I'm here to help.