I've rebuilt the cab and fixed the wires in the power supply. Good news is it now powers up. Bad news is there are still issues.
The 1 slot has a video RAM error
The 60 in 1 is fine!
The LED header is working fine!
Monitor is unwell :( It makes a bigh pitch buzzing and produces no image. It did briefly produce an image but that disappeared when I pressed the test button and the buzzing returned.
With a jamma pcb connected through the jamma > jvs there's no sound but when I connected a naomi set up (set at 15k) it would play blind. It wouldn't coin up with the coin switch, had to do that with the service button. I guess the chassis needs servicing. Maybe a new monitor required. I have some expert friends coming over soon so I'll get them to have a peek and give me some advice.