I have a Sony KP-57HW40 and for the last year or so I get a line down the middle of the screen. It can be blue, red, or green. Its not there when the TV is showing HD, just digital. Also if I plug the cable into the TV via the coax in I do not get the line. I have also tried to switch the components around and that dose not matter. If I play a DVD I have yet to see the line. My DVD player is ran through a Denon AVR 3805 and I also had the TV set up this way and I still had the line. I clean inside of the TV a few times and the problem doesn't clear up. The line is not always there. Just seems to depend on what colors it is on.