I have a 24" Sony flat trinitron monitor, model GDM-FW900 that has the
following symtomps:

There are several horizontal strips of the reduced brightness. One
large strip(2") is located on top, and there are several smaller
strips(1/2") between center and top of the screen.

I still can see the text in those areas, but it is approximately 35%
darker. This problem appears when monitor warms up. There is slight
vibration of these dark horizontal strips. The text behind doesn't
move.

Any ideas? Anybody has a schematic they would be willing to share?

Thanks