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Vorlon
 
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Default Zenith pict comes on bright then goes dark

Hi
I was wondering if any of you have had any experience with Zenith
H0958x or H09c59x 9" TVs. These TVs were also modified by a company
called PDI for hospital TV usage (PDIZ9TV-B)but doesnt seem to be a
problem in the modifications, I could be wrong though.

When first powered on the TV will come on full brightness then quickly
fade to a very dim picture. The audio is ok as is the on screen
displays but as I said the video get very dark, almost completly black
on some. And on some of the TVs the brightness will return to normal
after being on for about 3 or 4 min while others dont seem to ever come
back up. But turning off tv then back on will continue to give the
normal brightness good pict then fade away results until TV has "warmed
up"

Also the voltage on the high voltage anode is still present. It seems
to be something in the video chip and associated components since the
on screen display and menu appear normally but I havent had any luck
tracng the problem down.

I have recently inherited about 7 or 8 of those TVs so any help would
be apreciated