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

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My remote will open the overhead door when I am standing inside garage, but not from outside

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Limited range of your remote controls could be related to radio frequency interference that comes from something in your home or in the surrounding environment. Certain electrical devices can radiate interference; this could be almost anything that is plugged into an electrical outlet.


Please keep in mind that the device can be brand new, or can be an item that has been in use for quite a while. Also, the item may continue to function properly as far as you are able to tell. The only problem with the item may be that it has started to broadcast the interference, with no other symptoms noted.


Some devices are more likely to generate interference than others. This includes TV cable, cable amplifiers, surge protectors, fluorescent lights, battery charging devices (power tools, golf carts, etc.), anything that utilizes a timer (sprinkler systems, lights, alarm systems, etc.), and a myriad of others. If the problem seems sporadic, we can safely assume that the device responsible for the interference is only being operated during these times. Again, please keep in mind that the age of the device does not determine if it is capable of broadcasting unwanted interference. Any electrical device can be the source of the problem.


The first step is replacing the battery in your remote. If the range on your remote does not improve, remove the wall control wires from the overhead unit. If the range does not improve you will likely need to replace the remote control. After replacing the remote, or if you have other remotes programmed in to the opener, and the range problem still exists, please proceed to the Power Down test.


Multiple garage doors:
If you have two garage door units and one is working just fine, you will need to start by unplugging the good unit. This will help determine if the unit with no range starts to function properly. If the range comes back to the bad unit then you will need to replace the logic board on the unit that was unplugged as it is emitting an RF signal that is over powering the other garage door opener. If the range doesn not improve after the “good” unit has been unplugged, replace the batteries and try programming some additional remotes to determine if the existing remotes are the issue. If the extra remotes do not have any range then you would need to replace the receiver logic board in the “bad” unit.

Posted on Dec 12, 2009

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If this picture at the link shown looks like yours, the red and white cord with the red plastic piece needs to be pulled to disconnect the automatic door opening chain.

http://www.aypapaquerico.info/overhead-door-legacy/overhead-door-legacy-large-size-of-garage-and-modern-overhead-garage-replacement-with-legacy-opener-overhead-door-legacy-496cd-b-manual/

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Th?? Liftmaster 61LM remote ?? th? equivalent remote tο th? Sears Craftsman 139 model number listed above. It h?? dip switches inside th? battery compartment th?t ?ου match up w?th ?ουr existing remote tο m?k? ?t open ?ουr garage door. Th?r? ?? ???ο a set οf dip switches οn th? overhead opener itself ?f ?ου nο longer h?ν? a working remote. It ?hου?? b? easy tο find οn th? garage door opener. Th?? remote operates οn a 390 MHZ Frequency, ?n? works οn models frοm 1984-1992 essentially.

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This is not too uncommon. What tripped the breaker in your house also got to one of the relays on the logic board of your opener. The only cure I know of is a new logic board.

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