Still having problems? Sounds like the motor or linkage is locked up. Disengage the connection to the door(pull the rope with red handle that allows manual door opening) and see if it works that way. Check the voltage and amps going to the motor to see if the circuit board is acting up again.
Check to see if the door opens manually without great effort. Maybe your springs slipped or are out of adjustment overworking your motor causing it to burn out.
It is probably easier and cheaper to replace the entire opener than a motor or circuit board. The same brand would allow using the same mounting brackets and would be a quick install. Post back with how it checks out.