(I asked this question once before, but received no replies, so thought I'd give it one more try).

I've got a Samsung HLN617W. One of the pixels has gone bad, but in a way that confuses me.

When the set starts, it is fine. After an hour or two, one pixel starts acting up, as described below.

If the pixel is supposed to be black, it is black. If it is supposed to be bright white, it is bright white. If it is supposed to be a bright color other than white, it is bright white. If it is supposed to be a dim color, it is black or dimly flickering grey.

What the heck could cause this? If it was a stuck mirror on the DLP chip, it would be always white or always black. The fact that it can do both shows the mirror is still working. If something was slowing down the response time, so that it could not flip fast enough to sync with the color wheel, that could explain why colors are now white, but I'm not sure this explains it all.

And what would cause one pixel's response time to go out of whack, but only after the set has been in use for an hour or two?