After several visits from my service center, we may have fixed the flickers issue with my set. However, after the replacing of the faulty parts, I seem to have a severe problem with my gray-scale. When the television is on a video input without a source connected (say Video 3 without the VCR turned on) the screen is supposed to be completely black. On my set however, the upper third of the screen is a light gray with the rest being black. Can anyone offer a procedure that would correct this gradient in gray-scale? The problem is very noticing and quite distracting. Thanks for any help.