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

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Electrical Problem with Sears opener

When I tried to operate the opener, there was an electrical flash and some smoke. Now the unit won't operate at all. The wall button isn't lit. Visual inspection of the logic board, motor, terminal block, and capacitor showed nothing. How can I determine which component is bad?

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Hi there, i would suggest a break point test with a voltage test needle. Im sure that this electrical surge has torched your power supply board. this is the reason for the non operative state.

Posted on Feb 17, 2009

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It sounds like you may be having some interference. See if this helps.

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.

On the rear of the motor unit near where all those white wires go you will see an LED. Random flashing is normal but a rapid steady flash is an indication of interference.

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FIRST CHECK TO SEE IF THE LOCK/VACATION BUTTON ON THE WALL CONTROL HAS BEEN ACTIVATED. THE LED ON THE WALL CONTROL WILL BE FLASHING. - SIMPLE SOLUTION PUSH THE LOCK BUTTON AND HOLD FOR 2 SECONDS TO TURN OFF LOCK FUNCTION.

SECOND TRY TO REPROGRAM THE REMOTES TO THE UNIT - THEY WILL SOMETIMES LOSE MEMORY IN AN ELECTRICAL STORM.

IF REPROGRAMMING DOESN’T HELP TRY REPLACING THE BATTERIES IN THE REMOTES AND THEN REPROGRAM.

HOPE THIS HELPS

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do you see burn mark on board? Is so and unit is older than 15 years, buy new one.

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Both openers stopped working at the same time but they are both plugged in to an outlet that still has power. The lights are out on the opener wall switches. Wife thought she smelled electrical smoke when...


what openers? Sears/liftmaster of last 2 years have no reset. Sure power to outlet? Try a lamp. Did a gfi trip. Did wife run both doors to overheat them. they should cool off in 15 minutes. Do you have a surge protector. Did it go bad. Some kill power when they get cooked. Did you have a lightning storm. Culd have cooked logic boards.

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