Problem with Pioneer SX-737 Stereo Receiver

[dandanflake]

Hi, I recently made this post on Audio Karma but I decided to throw it here too to see if anyone in the Geekhack community could help me as well.
I recently got my SX-737 fixed for a fried output relay. After it was fixed it ran perfectly for weeks. A few days ago I had left my receiver on overnight (on accident, I always turn it off when not in use) and I came back and.. no sound. I turned off the receiver for awhile and then turned it back on. I got the "click" but then shortly after the right speaker (Pioneer HPM-60's) made a crackling noise and popped. I turned it off again and then turned it back on and received no audible "click". I turned it back off and waited about 20 minutes and turned it back on and I DID receive the click again however the same issue occurred shortly after. I re cut all of my wires and attached them to the B connectors instead of the A and... it worked perfectly fine. However about a day later while watching a video the right speaker started crackling and then... no sound. Same issue as stated above. I really only seem to hear the sound from the right speaker. I'm not sure what the issue is. If maybe it's an issue with the right speaker that could have fried something? Also of note I don't know if it's just coincidental or what but both times I had left my receiver on for long periods of time prior. Although of note I have used it for periods just as long prior. Any answers to this problem are greatly appreciated. Thank you

[fohat.digs]

I have a similar vintage Pioneer that got flaky on me last year. I never diagnosed it and repaired it, because I really don't know much about circuitry, but capacitors are often the first components to fail.

[dgneo]

Hi, I recently made this post on Audio Karma but I decided to throw it here too to see if anyone in the Geekhack community could help me as well.
I recently got my SX-737 fixed for a fried output relay. After it was fixed it ran perfectly for weeks. A few days ago I had left my receiver on overnight (on accident, I always turn it off when not in use) and I came back and.. no sound. I turned off the receiver for awhile and then turned it back on. I got the "click" but then shortly after the right speaker (Pioneer HPM-60's) made a crackling noise and popped. I turned it off again and then turned it back on and received no audible "click". I turned it back off and waited about 20 minutes and turned it back on and I DID receive the click again however the same issue occurred shortly after. I re cut all of my wires and attached them to the B connectors instead of the A and... it worked perfectly fine. However about a day later while watching a video the right speaker started crackling and then... no sound. Same issue as stated above. I really only seem to hear the sound from the right speaker. I'm not sure what the issue is. If maybe it's an issue with the right speaker that could have fried something? Also of note I don't know if it's just coincidental or what but both times I had left my receiver on for long periods of time prior. Although of note I have used it for periods just as long prior. Any answers to this problem are greatly appreciated. Thank you

Any pics of the internals in their current state? I've the black-faced version of the 737 (7730), and mine has had to have a few caps replaced.

What ohms are the speakers that it's powering? Unlikely that a speaker caused it, unless it's stressing the 737 too much (ohms too low, etc.)

[dandanflake]

Hi, I recently made this post on Audio Karma but I decided to throw it here too to see if anyone in the Geekhack community could help me as well.
I recently got my SX-737 fixed for a fried output relay. After it was fixed it ran perfectly for weeks. A few days ago I had left my receiver on overnight (on accident, I always turn it off when not in use) and I came back and.. no sound. I turned off the receiver for awhile and then turned it back on. I got the "click" but then shortly after the right speaker (Pioneer HPM-60's) made a crackling noise and popped. I turned it off again and then turned it back on and received no audible "click". I turned it back off and waited about 20 minutes and turned it back on and I DID receive the click again however the same issue occurred shortly after. I re cut all of my wires and attached them to the B connectors instead of the A and... it worked perfectly fine. However about a day later while watching a video the right speaker started crackling and then... no sound. Same issue as stated above. I really only seem to hear the sound from the right speaker. I'm not sure what the issue is. If maybe it's an issue with the right speaker that could have fried something? Also of note I don't know if it's just coincidental or what but both times I had left my receiver on for long periods of time prior. Although of note I have used it for periods just as long prior. Any answers to this problem are greatly appreciated. Thank you

Any pics of the internals in their current state? I've the black-faced version of the 737 (7730), and mine has had to have a few caps replaced.

What ohms are the speakers that it's powering? Unlikely that a speaker caused it, unless it's stressing the 737 too much (ohms too low, etc.)

The speakers are 60 watt speakers and are 8 ohms.That should be fine with the SX-737. The speakers I use are Pioneer HPM-60's which are also vintage and were commonly used with the 737 back when. As for the internals I'll have to take it apart and post back on what they look like. I'm hoping this will be an easy problem to fix.

[dandanflake]

Ok interesting update on this. I just turned on my receiver and it plays everything fine again. I literally don't understand what's wrong