Well, I've got a 4-port Atari 5200 system that I mistakenly left plugged in for a while, and when I powered it on last night, I got nothing but black screen. I changed over to my backup switchbox, and the picture was fine.
I've read that the switchboxes are easy to repair, and I've got basic soldering skills. I opened it up I saw that everything is nicely mounted with legs onto the board, so now I just gotta figure out which component fried and get a replacement. While the Atari 5200 faq (posted at Atari Age and gamefaqs.com) tells me how to build one from scratch, it doesn't seem to cover repairs to the original switch boxes. Any helpful hints?