The other day I bought a cheap faulty Korg A5 guitar effects pedal board from Ebay; these units were always too expensive for me back in the day so I thought it would be a nice little addition to my guitar gear.
It turned out to be a simple fix; one of the power jack terminal pins had rather sneakily broke the entire power track; so after adding a wire link and then replacing one of the broken pedal pcb switches with a switch from an old keyboard, which was a perfect foot-print fit! I gave it a good clean; It didn't take long to put it all back together, then I fired-up my amp and gave it a blast, and it now works really well!
Pictures attached.