Sears garage door opener 139.53629srt
I have replaced the gear and sprocket assembly on this because they were stripped, now that I have it back together all it wants to do is go up, then it stops when it hits the housing and the motor keeps running or humming. I have tried adjusting the limit switches, but when center touches either the up or down, it still runs in the up direction. I suppose that is why the gears were were stripped. My question is, do I need to replace the limit switch assembly?? Or would the circuit board be bad?? Or any help please.