Major pedal board issues!

[Paul Marossy]

There is only one shotgun approach that I can think of that might work. Since this is an older pedal, maybe the main input filter caps are reaching end of their working life and are going to higher ESR. The middle photo shows five stand-up-cylinder electrolytic caps. It would be cheap and mostly straightforward to replace those in hopes that it would cut the fed-back interference. This is easy if you have some soldering skills and the board is double sided only. It is hard if you don't have soldering experience or if there are inner ground places on that PCB.

That's worth a try. My suspicion is that one of the ICs is wonky. But it might just be a bad capacitor, you never know. Is there any tantalums on there? 

I managed to replace electro caps on a four-layer motherboard successfully once, but I had to pull out every soldering trick I know to get it done and not trash the motherboard.

I did that once, too. I don't know how many layers it had, but it was the hardest thing ever to unsolder!

[username]

I haven't been able to find a temporary replacement for it, unfortunately...

[Galego]

I'm using a sh*tty one spot power supply for them,

What brand of one spot power supply is that?

Now that you mention it... I just got 2 1Spots for free (the VisualSound ones). A store that I do pedal repairs for was throwing 3 of them away. All of them with the plastic piece that holds the AC prongs loose, which led to the AC wires also breaking. I was able to repair 2 of them by prying open the case and gluing that piece to it, since the screw hole had broken off. One of them doesn't work.

So if there's anything shitty on the 1Spot, I'd say it is that screw that holds the prongs in place. It's its Achilles heel.