If the brightness is adjusted correctly for the line level input, the
coax input will be darker by a large amount. Is there a setting for this in
the serivce menu, how is it accessed on this model? The screen does not roll
at all. Thank you very much for all your help so far.

-glasnostJDC

"David" wrote in message
...
So please give more details. Which is brighter? Is one too bright or too
dark?
That set may have a limited service menu, early Zenith service menus did
have eeprom value settings for rf brightness and video brightness.

If the video input is low, you could have a weak capacitor in the video
path. Too weak and the picture will roll.

David