Why not try to replace the whole power board,(and troubleshoot the original later).
as i read, the fuse is burned,so something short in the circuit causing the fuse to be burned..
isolate the power board,replace the short/leaky/open components.after replacing the bad components,connect a serries 50 watts bulb to the fuse and connect it to power source..if the bulb light thier is still short components in the circuit..if the bulb did not light then the power board is now good for voltage checking..
