Popeye Pachislo - lcd display not showing graphics- HELP!!!

Hi
I'm new to he forum and hoping someone can help me out.
The Popeye machine has been working fine turned it on after a time of not using it and the surrounding screen lcd screen lights up / powers up white but no graphics/cartoons on the display?
Is there a lead loose or something I can do to get the graphics to come back up - rest of machine works fine but just no display on the screen?
Cheers
Any advise appreciated