studio spot 250 help

I have a 250 I'm working on that has a tag that says the F1 fuse keepes blowing. I pulled all the motor and fan plugs off the board, the fuse is not blowing but the display is ALL lit up! I have another board I could swap but I'm affraid that what was blowing the F1 might have messed up the board too. anybody got any clues?
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