I agree with GGG I'll bet you your board is now dead and you'll need another board, the problem is if you don't find what caused the short YOUR ASKING TO BLOW ANOTHER BOARD. you need to inspect thoroughly and if need be trouble shoot with a ohm meter while moving wires round no voltage applied just use ohm meter and see if you can get the short to show up if nothing is obvious I would look on the frame area described for a arc deposit that was left. anytime there is a short where ac hits the dc on these boards there usually toast!
Alan