Well the sound is lifted directly from the sound chip with Ben Heck's mod, there fore it bypasses the RF Board sound. Check to make sure the two connections to the snd chip are not touching.
The Video is lifted from the RF board, so if there's a problem with the RF board for video, it will happen with the mod too.
BUT, I think you said both CV's have the same video problem so I'm not sure whats wrong.
That power switch that you said moved around creates artifacts and blackens the screen, I'm pretty sure that's not related.
So I don't think I can help any further, unless there's something near the tv interfering or the power supply is plugged into a noisy power outlet.
Maybe move to a different room tv and cv and see what happens. Don't have the controllers plugged in just in case.
Edited by Mark_Coleco, Mon Sep 5, 2011 4:19 PM.