When the lay-person typically sees a circuit board, they immediately seize up and think that's it's too advanced for them to fix. In reality, replacing circuit boards for the Chamberlain Liftmaster, Sears, and Craftsman garage door openers is relatively easy with proper instruction. This video will walk you through the process of replacing the circuit board on a Chamberlain Liftmaster, Sears, and Craftsman garage door opener.
Roberto was very courteous and explained the details of what he was doing. He also pointed out a repair I might consider having done (replacement of the bottom panel of my door) and asked the office to follow up with me on this. Someone did follow up with me and since replacement of the bottom panel is not an option and I would have to replace the door, I decided that I can wait.
The torsion springs on steel rolling doors work the same way as other torsion springs in the garage door industry. When the door is closed, the spring is wound. The spring is secured to a spring anchor bracket on one end and to the shaft on the other. When the steel rolling door opens, the spring in the barrel supports most of the door weight. The remainder of this weight is lifted by the chain hoist or the operator.