Sometimes the sensors will be in alignment and just as the door gets close to being shut it will vibrate enough to push one sensor off.
Garage door opener goes down a little then back up.
See if you can find a manual online and go throught the setup steps again.
Try running the opener with the door still disconnected.
Your travel down setting needs to be adjusted.
There may be two nuts on one track.
You might consider calling a local garage door company to come and debug it for you.
If the door reverses and the lights blink 10 times there s still a problem with the sensors or something tripped them on the way down.
Check all of you conenctions and the installation of the new logic board.
In order to fix this you ll want to make small changes to the close limit setting until the door opener knows to stop once the door has reached the floor.
This is almost always the result of a dirty or obstructed safety feature.
If the door hits something hard it will reverse.
You push the button to close the garage door.
Here s a rundown of some of the possible reasons this can be happening.
When the opener reverses the screw turns the opposite way and the nut travels back.
If the door had hit a stop it would not have reversed.
Turn the down limit switch screw clockwise one turn with a flat blade screwdriver if the garage door closes and then begins to open back up.
If the door seems okay there may be a problem with the trolley or the opener itself.
It goes partway down reverses direction and goes back up again.
If these can t see each other when the door is almost shut it will send a signal to the garage door motor to open back up.
If it moves all the way up now then the trolley should be okay.
If your garage door is closing fully and then reversing to open again then it may be due to a problem with the close limit switch.
One for the opening limit and one for the closing limit.
The garage door will automatically go in reverse.
By adjusting the starting position of whichever nut the opening and closing limits are set.
Your garage door sensor works by having two photo sensitive devices on either side of the garage door.