Well Guys, I got that problem sorted. I made up a bench tester for the board comprising a 5v / 12v donar power supply out of some sort of machine (found it at work while scrounging around).
I studied the article on pin wiki about making your own bench test jig.
Only thing I wasn't too keen on with their setup is they used alligator clips connected to the relevant test points on the board to power it up. I decided to go a little further and after tracing the test points back to the correct pins on the J4 connector I made up a 3 wire plug (5v, 12v and ground) using a .100 molex connector.
Also added a key so it couldn't be plugged in the wrong way.
Plugged it in, powered up the board but initially it wouldn't boot, eventually I pulled the 5101 chip back out ( had removed it before from the board mounted in the machine)
Found I had bent some of the pins on my previous effort so straightened these out and put it back and she booted up fine, at least 6 flashes as I didn't have a 43v power supply for the solonoids.
Bunged the board back in the machine but it refused to boot.
To cut a long story short it ended up that I had plugged the ribbon cables in arse about and this stopped the board from booting, I only discovered this after disconnecting every plug except for J4 and working backward from there, finally after much head scratching and trying alternate combinations I happened upon the right one and she now works.
