I have a neogeo pocket here that i practicly got for free, the only problem is the screen isnt 100%, when the neogeo logo appears on the dark background i can see horizaontal lines and the dark color tends to blurr.

When playing games however it is even worse, the image is prety blurred and i can see a lot of horizontal lines especialy with pac-man.

I already openend it up but didn't see any damage.
Is there anything i can do to adjust the screen or is a simple case of a semi-dying screen.