Shilohhyena

Hello I have an Atari 2600 "Vader" it has worked flawlessly until yesterday night I unplugged the Atari from the tv (Coaxial to RCA Adapter using a switch box between cable tv and Atari). I went to my friends house and the image was corrupted (see link) every game is like this. I went back to my home and It is still corrupted. Any ideas? The Game is MIDNIGHT MAGIC. http://i.imgur.com/ZUHHb7P.jpg