If that resistor measures open that will cause a delay in the capacitor discharge making the motor hum.
Garage door opener hums after closing.
The resistor would need to be replaced.
When the logic board wears out it can cause your garage door to close then open and vice versa without explanation.
First check if there is something in the way of the door.
The lenses will most likely be attached to metal brackets attached to the garage door frame.
This helps protect objects which may not have been detected by the safety sensors.
This brain can wear out in time so you could need a replacement.
Think if the door was heavy then the close adjustment would have to be set higher and when the travel is done it would really go thump look for a strength screw by the closer adjustments.
When you find that your garage door motor is making a humming noise but not opening and closing it typically means that it has gone off track or needs some sort of small adjustment.
You need to measure its resistance with a multimeter and compare it to either what is stamped on it or the color code.
It might look like a nylon post out the back of the closer and easy to miss.
Because it hums when you try to open it the battery is working properly.
Locate the lens on each side of the garage door at the bottom.
Closing adjustment would be the bump sensitives.
A check garage door springs they seem ok to us.
Every time we press the button the motor makes a temporary hum and then nothing happens.
Clean the lenses with the cloth.
When the garage door is closing and it doesn t reach the fully closed position it assumes there is an obstruction in the way and then it reverses.
We looked through instruction manual which describes the opener motor hums briefly then won t work.
Your garage door s logic board is the brain of your garage door opener.
Genie garage door humming sound this method did worked out and the garage door been working great ever since i made this repair.
Here are the troubleshooting steps to follow when your craftsman garage door opener reverses after fully closing.
We ended up releasing the door and closing the door manually.
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.
Glad i did it so hope it hel.