My door suddenly quit a couple inches from open position, Now it rams against stop bolt even after giving slack and readjusting limit contacts. I removed the chain and it only rotates in one position only. The up limit contact has no effect on the travel as it will ram against stop bolt. When I ran without chain I removed the terminal from the down limit contact and it stops the motor every time, but when I remove the terminal from the up limit contact the motor still runs and will not reverse direction no matter what. I removed the gear from the traveling limit switch when doing these tests so not to strip. Is this the logic board cause I am out of ideas.