Cyber blowing F1 fuse on power-up

I have a Cyber that instantly blows fuse F1 when the unit is switched on.

Tried a different power factor cap - same thing. Swapped the PSU board with a working unit and the problem followed the PSU board. Also tried powering-up without a lamp - no difference.

So am assuming the problem lies somewhere on the PSU board.

Any suggestions as to likely faulty components?

Thanks,

Scotty.
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