Why do I lose my picture but I still have sound?

When I start my games I have great video quality. Then it changes to static and goes out completely but I still have sound. I have cleaned the game slot and the games, but it didn't change anything. Reading on here I scene mentioned the expansion pac trick. That didn't work either. I also saw about the changing of the video capacitor. However I have not been able to find that one. Can someone please send me a link to it? If you also have other ideas please let me know? I have new AV cables also thinking they went bad. Any help would be greatly appreciated! Thanks.

Here's a picture of the capacitor