Is there a way I can correct overscan and picture centering without disrupting the aspect ratio using the test patterns on the S&V disk? My TV is a Panasonic GAOO 27" (Don't know the exact model numbers) I found on the net some information on how to access the service menus. But it's all hex codes, not that I have a problem with that, but for example if the setting value for the H-Size and V-Size are say 27 and 32, to reduce overscan without altering aspect ratio doesn't mean I have to substract the same number on each. So that is why I need some sort of reliable test pattern that will let me minimize overscan and also I suspect that my picture is not perfectly centered (There are settings for H-Position and V-Position somewhere in those cryptic service menus) Is there any of the "Advanced Test Patterns" on that disk useful for that type of tweak? The convergance grid?