My garage door bucks like a bronco

Chamberlain Liftmaster garage door opener problems ...

? 3:10
https://www.youtube.com/watch?v=Zq_CxeTXoSM
Jul 2, 2013 - Uploaded by Mike McCarron
Might have taken a lightening strike, knocked out GFCI that was on the circuit that garage door opener was on. When I ... And sometimes after it happens it takes 30 or so seconds before the opener will work again. ... The keypad unit worked well butneither the homelink or the remote units worked.

Garage Door Openers - Lightning Strike - Forum - Bob Vila

www.bobvila.com/posts/30883-garage-door-openers-lightning-strike?...

Aug 6, 2005 - The house did not lose power and I do not believe the house was actually hit. ... the light comes on on the unit (as expected), but neither door opens or ... Afterplugging it back in, try opening the door with the hardwired button first - if it still doesn'twork, chances are your opener's taken some damage but not ...

I Have A Liftmaster Garage Door Opener Unit. The Remote Work ...

www.diyforums.net/i-have-a-liftmaster-garage-door-opener-unit.-the-re.

If these problems started immediately after a lightning storm, the printed circuit board is probably damaged. Contact a garage door service company (check the phonebook) for diagnostic support.

If when the door reverses the main light flashes 10 times you have a problem with the door sensors. Make sure they are pointed at one another and the small light on each one is lit and not flickering. They must be pointed at one another for both lights to be on. If you cannot get the lights to come on you have a bad logic board.

Check your door springs. Usually just over the door and can be seen when the door is closed. A broken spring is the most common cause of this problem.

You may have a fairly cheap problem that can be found by nearly any electronic tech in possession of a couple of instruments; specifically a decent multimeter and maybe a capacitance meter.
It is apparent that either some passive component or low-level transistor in the timing/sensing circuit has bit the dust.

Unfortunately there isn't a reset switch but I would pull the logic board and look for burnt or missing traces on the printed circuit board. Electronics do not like lightning.

Check to see if the trolley (the part that slides back and forth on the rail and is connected to the door) is jammed against the bolt just in front of the motor unit. If so, remove the bolt and run the door until it is closed. On the side of the motor unit there is an 'up limit' control. Turn this 3 turns in the opposite direction of the arrow printed on the cover. Be sure to replace the bolt.

If you had an lightning storm you most likely have a bad logic board. That is not a reset button you are pressing.

Remove the cover and take a look at the drive gear. It sounds like it is stripped.

What has happened is that you electric eyes are blocked or have gone out. The eyes are at the garage door about a foot of the ground on both sides. There should be a red or green light on one of them. If not some thing is blocking the beam that goes across the door. It is a safety beam so kids can nt get hurt when the door is coming down. If the beam is broke the door will go back up.