Question about Sears Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+

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My girlfriend has a 1/2 hp Craftsman garage door opener (model 139.5398511) which operates fine when cool but after several uses or later in the day the opener only partly opens the door (the height varies from a few inches to a couple of feet), the light blinks once and the motor stops. The door itself opens easily when disengaged from the chain. She accidentally installed high watage light bulbs at the opener which created enough heat to melt the plastic light covers. Could the logic board have been damaged by these light bulbs?

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Remove the cover and take a good look at the drive gear. It is white nylon and is just in front of the motor. Make sure it is alright. It will be obvious if it is starting to strip. If it is o.k. the look for the up force control on the rear of the motor unit near all those white wires. Increase it a quarter turn.

Posted on Jul 22, 2009

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Hi,
there is little chance for the board to be affected by the melting of plastic covers of light. if the circuitry is damaged by the heat, you'd notice the problems immediately, if it is working fine now, then there is no chance for this incident to affect the working in future.

cheers

Posted on Jul 22, 2009

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