Washer with full load will not go into a spin it will toss the load but not spin. If you take most of the load out it will then go into a spin.
Take off the back and see if the motor is trying to turn when it is not spinning. If not, take off the front lower service panel and look for tech notes that will tell you how to trouble shoot it. Focus on the door lock assembly and the speed control board, these are the weak links in these Frigidaire front loaders.
No the speed control board is separate. If you ordered the main board from this site you can return it if it does not fix the problem, and then try replacing the speed board.