Here's the steps to diagnose the board:
1. Unplug J2 connector from control board.
2. Check for 12 VDC at control board pin J2-8 to J2-3 Do you have voltage?
If YES: Short in fan motorcircuits! Replace fan motor
If NO: Replace control board and check all fan motors circuit for shorts. If short is detected repair short or replace fan motor. If you are not sure the fan motor is shorted or not, replace it anyeway. Failure to replace shorted component will damage the new control board upon installation