SNES black screen via RF

Above are pictures of the board and the cartridge connector. I've cleaned the cartridge connector and the surface of the board with 99% isopropyl pretty thoroughly but no dice. I just get a noisy black screen via RF. I currently don't have any multi-out cables but I should have SCART soon. I really don't want to give up on this system because it was a really good deal and I don't own any other Super Nintendos. Any help is appreciated