According to my knowledge and experience most dead pixels usually exist from day one because of the manufacturing process, there are also stuck pixels that can get unstuck and usually dont return after that. But Im pretty sure that they can develop anythings possible, but with the dozens of computer LCD screens and LCD Tv's that I bought it has never happened to me. To date there has only been two products that had dead pixels on them when I bought them and that was a computer LCD screen which I RMA'ed back and my Pre which I returned, because I couldn't exchange it back.

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