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I have seen this before, and I can only describe it as a flaking of the phosphorus coating in one of the picture tubes. If you can, remove the back such that you can take a flashlight and look down into the 3 picture tubes. If you see any flaking or dark spots in the phosphor, there will be a spot on the screen missing that color. Unfortunately, this is not repairable, as all 3 tubes would need to be replaced (like replacing all 4 car tires when one is completely bald) and that would cost more than a new TV.