I've got a Philips 42pf9966 which, when displaying only black / darks, has an area (top right) which is constantly darker than the rest of the TV. Its not screen burn and certainly not due to loudspakers. This seems to only affect the blacks as all other colours are perfect. (ie the Nickleodeon screen saver is all orange, and perfect throughout, but if it was black then you'd see the disparity) Is this normal? Please help F.