Home Improvement Questions? Ask a Handyman for Answers ASAP
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The opener may be trying too hard to open the door either because the spring(s) is weak or broken or the tracks/ rollers are bent or need lubricating. Since the opener is humming, I would definitely check these out. The opener does not do the heavy lifting of the door, the springs do all the work, the opener just aids in moving the door open.
With the door closed, disconnect the door from the trolley and operate the door manually. The door NEEDS to roll smoothly and not bind on anything and it NEEDS to be balanced and stay at any point you stop it. If the door wants to go down by itself the springs are weak and at fault, have a qualified service technician fix/ adjust them...don't attempt yourself, they can be very dangerous to work with since they are under extreme tension.
In addition, operate the motor unit without the door attached and see if it operates correctly. The trolley will fully go up and down if working properly.
If the springs are good and the door is moving smoothly manually but the trolley still does not move then verify that there is nothing stuck in the gears of the motor unit and make sure they are not stripped or missing teeth. If the gears are good then I would have to say that you have a bad start capacitor and it would need to be replaced. These average around $15, much cheaper than a new board.
If you need further help or clarification on this answer, please do not hesitate to reply to this post.