In an earlier post I said I was having noise at the top of the screen of my 50PX60U when it was displaying 720p (specifically ABC HD local station).
I did a new test. I attached a cheap rabbit-ear antenna to the antenna input of the 50PX60U, via a coax cable. Then I tuned to the ABC HD station using the antenna and voila, no noise. Switched back to the SA8300HD component input and the noise was there.
So it was the DVR that is causing the noise, not the station. I feel so much better!