Screen looks very similar to a troubleshooting image I was saw on JeffsGames.com:
Here's a link to his whole article:
http://www.jeffsgames.com/2008/05/28/pole-position-2-pcb-repair/
My PP2 PCB had chips missing everywhere and my only solution was to mail it off to Eldorado Games for repair. Notice the article mentions battery acid damage should be checked to see if any nearby components are in distress / messed up / etc.