Mitsu WD-62525 interference issue

I posted earlier about this issue concerning my tv, but I feel maybe I didn't explain it well enough for someone to comment on it.  The issue that I am having is when I am watching a DVD or TV through my digital box I can see lines scrolling through corner to corner as if it were picking up interference from somewhere.  To throw another loop into this is that when I am watching an HD channel or playing my xbox 360 the lines do not show up.  I ran an extension cord to an outlet on my 2nd floor and still had the lines showing when watching tv or a dvd.  Another point is when all of the inputs are turned off but the tv is on and showing the blue screen the lines are gone.  Does anyone have any idea what this might be.  Since I moved the tv to a different outlet and the lines were present I can rule out that the outlet is bad so I am assuming that it is something within the tv.  I had recently replaced the resistors on the DM board back in December, so I am very familiar with taking this tv apart.  Any help would be greatly appreciated.