Way back when, at the time the F3 came out, Nikon recommended the lcd panel be replaced at some interval I don't remember anymore. As I recall it was something like 5 years give or take. I never bothered, as initial interval and a many more came and went on my camera, and the LCD is fine.
Given that Nikon apparently intended for the panel to be replaced often, it should be an easy fix, if the part is available still. Probably worth contacting Nikon, or other repair service.