I saw this post at AVS. If he is correct the fixes you list wouldn't work since it's not the pixels that are the problem.
"Its true that LCDs are not supposed to burn in. Still some of them do. I have seen it before. It's not the actual LCD that is burned! It is the Anti-glare coating layer or the polarizer film that is becoming discolored. This is a result of cheap-o manufacturing process. The panel manufacturer is using substandard film layers for AG and polarizer."
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