can someone please help me with my sony tv (KV28FX68...100Hz). i have switched it on, started watching and realised that the top left corner of the picture is dipping. seems like there is 3-5mm of the picture not there. when i watched a dvd it was the same. is there a way i can adjust the picture so that it covers the full screen? is there some special function on the remote that i can use to have a full picture again. any help will be appreciated.