My garage door is a chamberlain lift master. We had to pull the latch and manually close it last week. When I opened it, my super-strength:) threw it open too fast and I think I threw off the main drive piece. Anyway, when I shut it now, it moves too far and closes completely, but then reopens. How can I move that metal piece that the latch attaches to? It is very secure and I don't want to start prying at it. Is there a trick?

SOURCE: Door will only close when held down

if you obstruct the photo eye does the light flash ?

SOURCE: chamberlain garage door opener not working properly

Turn up the force adjustment or the bottom part of the door could be getting in the way of the photo eyes.

SOURCE: Chamberlain garage door opener won't close

read manual, if you have, on trolley engagement

SOURCE: Chamberlain Garage Door Opener will not close door

It is most likly your sensors You should not have to mess with your force settings but I can help you with your sensors assume you have checked to make sure there both looking at each other. First close the door so you can see them better. Tap each one of the sensors to see if any of the lights are flickering. if your then you need to tight them up and try again. Also when its dusk or night close your garage door and look at the lights see if one of the tracks is shaking sensor. If not check the wires make sure there is not staple or cuts in them. Then last thing you can check see if your door is hitting the back of the sensor mount it does happen. Also remove and ropes or handles you have fromt eh buttom of the door. That should take care of the problem. Make another post if your still having problems

SOURCE: Garage door opener doesnt close the garage

If you have to hold down the button to close the door, you are bypassing the sensors ...
Check the alignment of the sensors. Should see a solid GREEN light