Avanti garage door not working ??? is there a repair manual

If this picture at the link shown looks like yours, the red and white cord with the red plastic piece needs to be pulled to disconnect the automatic door opening chain.

http://www.aypapaquerico.info/overhead-door-legacy/overhead-door-legacy-large-size-of-garage-and-modern-overhead-garage-replacement-with-legacy-opener-overhead-door-legacy-496cd-b-manual/

Then, pushing the garage door fully open should move the mechanism back to connect in the ceiling. Then the remote control may work. If not, seek a repair service.

Not sure but here are some manuals that may help:

Garage Door Opener Parts Center Chamberlain Do It Yourself Products

459950 Chamberlain Garage Door Opener Repair Parts Remotes Keypads

Chamberlain Whisper Drive Model 459950 547445 Owner Manual

When the motor stops in the down position, pull the emergency release handle. Push the door fully closed by hand then engage the emergency handle. Open the door with the remote and then close it with the remote to make sure the door closes completely.

The relay contacts are worn. Replace the relay first. If the condition is the same , look at the motor's safety overload device.

Did you change the batteries?

Sounds like your logic board has quit working.

Well, I don't think that disconnecting the garage door from the garage door opener would affect function.

The lightning strike could have destroyed the circuitry inside the garage door opener, seeing that it won't operate with the wall switch or remotes.

It's likely that a board was fried by the lightning which would render the garage door inoperable.

push the green button on the opener then push your remote button

you will need to train (link) the remote to the garage door opener. to do this you will need to find the remote "train" button on the operator.
If you have the manual for the garge door opener this will show you where it is located.
push the train button on the operator, an LED light will start blinking. Then push one of the buttons on the remote. the LED light on the operator will stay on. push the button on the remote again and the light on the operator will turn off.
try the remote it should work now.

didnt try everything cause if you did, it would work! Get two people and garage door opener. One read manual from car under Garage door" or Homelink while other pushes button. When manual says if this did not work or if you have security plus or rolling code, continue with other instructions. You will need a working remote and will need to pushh learn button on motor logic board.