A friend of mine has a Toshiba Cinema Seies 36" tube and is having a problem we cannot figure out. When watching television (cable) or a DVD, we can see farely large swiggle-type lines in the middle of the set. They are most apparent when the screen is black. Even if the video source is turned off and the whole screen is just black, you can still see them. I'm positive it's not a magnetic shielding problem. Although, I'm having trouble figuring out what else it could be. Any thoughts or help is greatly appreciated... Thank You.