[Cpt Rick]

I have to agree with Drax, if it's definitely hiss, then it's probably one of the components, not the cables.

One of the biggest problems I've found through a gazillion tech support calls, is that although people differentiate between hum and hiss, they seldom articulate it during the call or post.

So, I always go with the LCD in this case, then work up from there. I think the only way to isolate it is to take it apart and put it back together piece by piece until the noise comes back.