I have the following set up:
Toshiba 51" CRT HDTV
My Tivo and Xbox go into my receiver, which I use to switch between them on one of my TV's component inputs. (My Tivo started having HDMI problems like so many other people, and I am more than satisfied with the picture on component)
My DVD player runs directly into my television's second component input.
I only have two component inputs each on my receiver and my TV so this seems to be the most reasonable solution for me.
My problem is that when watching the Tivo, and only that, I get a faint scrolling vertical bar or line, running from right to left on my picture. It is almost always unnoticable when programming is on, so I've just lived with it, but I'd like to get rid of it. It is somewhat noticable on Tivo menus with the green background, but it is most clear on the gray screen that comes up for a second or two when switching channels.
It never happens with DVD, XBOX or over the air programming.
I can't be sure, but I suspect it has to do with the component inputs on my tv. I don't recall this being an issue before I started using both component inputs. I can't pin point it to that for sure, but it's my suspicion. It also never happened on my old SD Directv Tivo.
Yesterday, I had to move my TV slightly to get something behind it, and the scrolling bar became extremely heavy, visible through all programming, and impossible to watch, but by moving the TV back, and maybe jiggling it a little bit, it went back to it's previous faint and watchable quality.
I suspect someone is going to tell me it's a ground loop, but I'm not sure. Maybe it's just because I don't want it to be a ground loop, because I don't even really know what grounding of the Tivo means or how to look for it and fix it.
But moreso, I would have expected if the Tivo was not grounded correctly, it would have been doing this from day one. Maybe that idea illustrates my ignorance of grounding, I don't know.
Any suggestions you might have are greatly appreciated.