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When you say the LCD looks old and grey, does that mean that you cannot see anything in it? no picture, no menu items, no info ?
Or is that still visible, just at very low contrast and/or hardly visible?
How old is the D90 camera in question, please?
It's not within warranty if bought used from a pawn shop, unfortunately - so the serial # ***** ***** little importance. (Though possibly Nikon might think differently - you could inquire.)
Looking through the lens, doesn't involve the screen.
I would advise you to inquire with Nikon, at
about repair of this grave screen error (or doubtfully, memory error.)
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