you're watching an SD program? Maybe you're using the S-video or composite input?
I'm getting lots of interference with my new 42 inch HDTV. It's the latest Sharp has for sale. I don't know what could be wrong. The lines appear when there is white on the screen. When the picture shows dark images the lines go away. Any help would be greatly appreciated. I have a feeling I'm going to have to return this 70+ pound bad boy.