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

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My light bulbs keep burning out prematurely on my garage door opener.

I have tried replacing the bulbs with heavy duty ones but this did not solve the problem. Someone suggested that i might have a problem with the logic board. Can this be repaired? My model number is 139.18470.

I have a 1/2 horse craftsman opener that utilizes dual light bulbs. I put 2 new bulbs (heavy duty) in and both burned out as soon as I pressed the light switch on the control pad.

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I had a similar problem on my Liftmaster units made by Chamberlin. I would leave the garage door open for hours during the day so our dog and children can enter the house through our garage and laundry room. Everytime they come into the garage the Light's would go on because of the safety sensors are "tripped" at the bottom of the garage door tracks.
I turned off this feature and my lights are lasting much longer now. Over 1year in fact. To turn off and on this feature, make sure the opener light is off, then Press and Hold the Light Switch on the Wall Control Until for about 10 seconds till the light goes off. This deactivates this sensor from turning the lights on, but does NOT deactivate the sensor for Stopping the door if something is under it. Safety is still preserved.
Additionally, my door opener would vibrate while operating, and need to be aligned - I did this and also prevented the bulbs from "shaking". As we know the light bulb filaments are brittle especially after some use - this I think also helped lengthen the life of my lights on the opener.

Posted on Jul 01, 2012

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This is a logic board issue. You can purchase a replacement one at searspartsdirect.com. Enter in your model number and a parts list will come up. This is a fairly easy install, make sure and unplug the unit first. You will have to reprogram the remotes. Thanks BB

Posted on Sep 17, 2010

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