Liftmaster formula 1 door won't open

Garage door opener stopped working this morning. Even when I use the controller installed on the wall it won't open. I can hear the motor running when I hold the button. What could be the issue? Take the case off...look for white plastic snow. If it's there, the gears need replacement. No access to that specific manual...but that's a common problem with that and other brands made by the same company. Is it a chain or belt drive? They use the same inner parts. Also pull the emergency release and open and close the door, it should be able to be opened and closed with one hand and stopped mid way and have it stay in one place. If the doors binding it can cause the gear to stip. OK i'll open it It's a belt drive Here's a few things I've noticed Gears are in good shape. One of the spring was hanging and the aircraft cable was all chewed up in the wheel so I had to cut it off The belt is running but the arm that's attached to the door doesn't catch on the trolley Lots to fixed!!! OK so after reading the manual I realized that the main issue was the arm that attaches to the door wasn't locking in the trolley so I put that in place and it's working fine. Now I need to know if I should replace the aircraft cable that's attached to the spring? Or the door can function without the second spring without putting too much strain on the motor. And also since it's open what should I use to grease up all the nylon gear? Oh no! If a spring is not working correctly...fix it! The opener is designed to open a balanced door...which you don't have. Might work for a while, then you'll be replacing gears AND cables and pulleys. White lithium or silicone crease. They make special stuff..but those would work fine. Great thanks for the help you know..........if you dont 100% know what youre doing with a garage door spring, hire a pro. there is zero shame in keeping all your fingers and spending a few $$$'s. just a thought from a journeyman hanger who pays a guy to do plumbing...painting.......flooring.....i could go on..

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