If you've got one of the motherboards with the fuse, it's a simple repair, IF you can solder. The thing is soldered onto the motherboard, and looks like a small resistor with no color bands. Like I said, I can't give you the exact spot without my manuals. If your motherboard is older, it could mean the trace feeding the port melted. I have seen that happen too. In that case, I'd recommend putting in a fuse just bypassing the open trace. If you don't fix it, it's no big deal, it just means you won't be able to use the 520 or an external genlock.
