How do I check for a short in my dishwasher

How do I check for a short in my dishwasher

my dishwasher stopped I checked the junction box and the nuts were burned out I fix that, still no power to the unit, I changed the control board twice & the door assembly, I've got 120v at the junction box, also power to the door switch but once I connect it to the control board no power. So how to I check for a Short in the components. It's a Frigidaire FDB1050REM0