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Active matrix problems



A couple weeks ago I told this list that one of the pixels on my
TP701's active matrix TFT was acting up.  It went bad for a day,
then started working again, then went bad for a week.  It's worked
fine ever since, but now *another* pixel has started acting up.
This one is also blue and semi-stuck on.  It flickers from faint
blue to bright blue.  Every once in a while it works fine.

Does anyone know if this is normal for a pixel going bad?  Or could
there be an electrical problem elsewhere?
--
John H. Kim
jokim@mit.edu