It's nearly impossible to completely disable those things. Built like tanks they are
I think I was watching that auction for a while. I buy a LOT of broken consoles. Then I fix them and never bother selling them LOL! I gotta stop hoarding all this crap.
Hey, on that "fried" SNES, did they tell you what was wrong? Those systems are incredibly robust. I would wager that the only thing wrong is a blown fuse. It's SUPER easy to replace.