Quote Originally Posted by Tanooki View Post
Looks like a broken RF adapter that's beyond its life. I've seen this on the NES and older stuff like the fairchild channel F which is from the mid 70s. Try getting a new RF from radio shack or something, or get a RCA cable and pop that in. Even if the RCA you have is stereo, it still will at least let you see and hear if it's a busted system or busted RF cable.
http://www.ebay.com/itm/For-SNES-Sup...item2c7f5a78fb
Would this help?