Lupin the Third III Pachislo Screen Dim and/or Inverted

[Jedah Doma]

So I just picked up a Lupin III Pachislo for a song. Problem was the screen is a bit iffy. It's very dim and displays what I can only describe as inverted color (what should be white is black etc.). I've looked at connections and tried to diagnose the problem on my own but have come up blank. Anyone have any idea as to what might be causing this? Is it an easy fix or should I be looking at a new screen?

I've attached a picture of the screen so you can see what I'm talking about. Thanks in advance for any help.

IMG_20130610_183130.jpg