[ScottishColin]

I admire your optimism...

Colin.

Originally Posted by SiriusHardware

Not really, because the best / most convenient source of test signals for the monitor is the mainboard. If we get to the point where your scope shows video and sync signals coming out of the mainboard but still nothing on the monitor, that's the time to go looking at the monitor.

Wait until you have a replacement UD7 - who knows, that may be all the machine now needs to make it work. (He says, optimistically). .

Best not to over-think things at this stage - whenever you find a definite fault (as you have with UD7, which is a big step forward), fix that first and see what effect that has before moving on to look for any further faults.