This can be a common problem in garage door openers utlizing dc motors such as the overhead door phantom 777cd or even the newer model overhead door legacy 850 2029.
Genie garage door motor hums.
The problem may be a faulty transformer located inside your garage door opener motor head.
I have a sears garage door opener.
Is your overhead door garage door opener making an unusual humming sound.
Genie garage door opener systems accessories and installations are well known and trusted by consumers.
I would have to hold down the wall button to open it all the way.
Then it quit doing that.
There was a short period where the door would start to open then reverse just a little and stop.
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I have a genie screw drive garage opener about 8 years old.
I released the door from the screw drive.
Can you let me know what the problem is.