Unfortunately I think this may be my fault.

I managed to blow one of the fuses while initially testing the display board and replaced it with a 250mA fuse that I had on hand so I could continue testing. What I later forgot to do was source and replace the temporary fuse with one of the correct 1A rating. My guess is that the underrated fuse has blown. You could confirm this my measuring the voltage on the capacitor on the back of the display board for 60 volts (be careful).

Of course I am happy to fix this and apologise for the inconvenience.

Rod.