VECTOR: Starwars Main PCB Problem

Hi Guys,

I'm just trying to repair a Star Wars Main Cpu board (running ESB).  AVG and Sound Boards are Tested and 100% OK.

It passed all the diagnostics.. Divider OK.. Mathbox OK.. Scaling Tests OK... BLEEPS/RAM/ROM/Checksums etc... All Fine...

During the Game, a lot of the objects are either missing / distorted / or chopped (walkers have legs but nothing else) / Tie fighters are just dots.

Now I could swear that I found a FAQ somewhere (listing missing tie fighters as a problem), but cant seem to find it now...

Any hints or assistance in locating the problem would be appreciated... 

Many thanks, 
Regards,
Colin