Question about Sears Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+
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 tried a REVEAL(brand) 40 WATT DOUBLE LIFE CEILING FAN LIGHT BULB , and almost two months later it still works. It is sold at Home Depot in Illinois. The filament is much thicker than any of the other heavy-duty bulbs I have tried, and that seems to be the difference. The REVEAL bulb is the only one I have tried that has lasted this long.
Posted on Jul 23, 2008
I finally got so disgusted with replacing bulbs every month that I replaced them with CFLs.
Solved the problem!
Posted on Jun 03, 2008
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Posted on Jan 02, 2017
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
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
Tips for a great answer:
Jun 11, 2011 | liftmaster Chamberlain Garage Door Opener...
the small metal tab at the base of the socket. Clean away any
corrosion you may find on the tab as much as possible. With a small
instrument, generally pry up on the metal tab to ensure that it will
make solid contact with the light bulb.
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