Old garage door opener question

Hi.  New to the Forum, and hoping someone more expert than I can help.  

Because of COVID-19, I finally, after 22 or so years since bringing it home, got the Stanley WH455 QuietGlide garage door opener I bought at Home Depot out of the box and installed it.  I know.  I know.

Install went great, safety sensor works and light works, but when I got to the last page of instructions on how to "learn" up position and down position, the unit was unresponsive.  The motor that drives the chain wouldn't engage, either in response to the remote button pushes (changed the batteries to new ones and still no dice) as well as the buttons on the unit itself that are supposed to move the door up and down.  Didn't notice any hum or smell of burning.

Took the unit down and put it on the bench and opened it up.  I had thought that perhaps after sitting all this time, the charge capacitor would be the culprit, but it isn't bulging or leaking, and everything else looks pristine, although there was a very, very (very) faint burnt aroma from the motor.

Would a motor that sits for 22 years somehow electrically "seize" and burn up when first applying power?  I was able to manually grab the shaft and turn the motor, and it rotated the sprocket.

Thanks in advance for the assistance.

Thom

Could be an issue with the logic board. Do you see any burn marks on the circuits?