I have Sylvania 6420 FF 20 inch TV - we purchased it from Sears in 2005. The picture on the screen is too big. I was on the phone with DirecTV for several hours we finally determined that the problem was with the TV. The picture is also too big when it is hooked up to the DVD player which does not run to the cable box so I know it's a problem with the TV. There is no zoom button on the remote control that I can find. Is there some way I can fix this? is there something I am missing?