Many many moons ago, I bought a used SCSI based 16MP digital back (very very old one lah - company "chup lup" already) with a 'power supply' problem and I never got it fixed. I thought I'd get someone locally with good electronics kungfu (with smt diagnosis and soldering skills) to help me repair it.
Basically the external power supply brick works good, so I am thinking that it's something in the back itself that's problematic. I have popped open the back to have a look and nothing at the power supply side looks burnt or smells burnt. But that's just a very rudimentary look. Last owner mentioned that the power to the unit became intermittent when it was on it's last legs.
I intend to 'convert' the back into some kind of panoramic shooting unit.
If anyone can help, let me know. I will pay for the repair, though I am not a rich man ;-)