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

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Can I bypass a starter capacitor to see if it is the problem why the motor is not working?

All the remotes click when activated but, the motor does not work. I checked to make sure all the door locks are unlocked and also checked for any resistance along the trolley assembly and pulled the trolley release and everything operates freely.

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Sounds like more of a circuit/logic board problem than a motor..over the last 10+ years I've delt with a lot of openers that have had surge or lighting damage but never have had a motor go bad.

Posted on Nov 10, 2014

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If it is the capacitor, the motor will just buzz for about 1 second. Dont bypass it. Capacitors are cheap. If the motor hums for several seconds, its a gear/sprocket issue. Also, make sure the traveller isnt all the way against the stop bolt.

Posted on Nov 10, 2014

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Release the door from the trolly.. Pull the release lever. Then on the motor panel where the wires are connected you can jump 2 of the terminals to bypass all... Watch to see what happens. The starter capacitor gives the jolt extra electricity to start the motor so not smart to bypass the capacitor. Without the door attached the motor should run. If you are handy you can run a 110 volt wire directly to the motor then plug it in to see if the motor spins... REMEMBER 110 CAN KILL SO I WOULD RUN IT OUT OF A GFI FOR EXTRA SAFETY

Posted on Nov 09, 2014

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Yes, you can temporarily bypass the capacitor to see if the motor will work. You should also verify voltage at the motor while another person operates the door to see if you get 110V.

Posted on Nov 09, 2014

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Posted on Jan 02, 2017

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SOURCE: Liftmaster 1/3 HP - humming, but does not open.

It's the gear drive. There are kits online for about $40, if you're semi-handy you can replace it yourself. Search for liftmaster replacement parts.

Posted on Dec 16, 2008

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SOURCE: Garage door opener motor doesn't work.

2 flashes is a safety eye issue, but you problen is most likely that the chain is not sync with the limit setting. Take the bottom off the gear and sprocket assemble and rotate center limit srew until it is in the same position as the trolley.

Posted on Jan 30, 2009

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SOURCE: Craftsman garage door opener 1/2 hp will not open door

It sounds like your chain is out of sync with the limit switches. Loosen the chain enough so that you can remove it from the sprocket on top of the motor unit. Now run the opener until the sprocket runs counterclockwise and stops. Now with everything attached and the door in the open position replace and tighten the chain. You are now in sync. You may need to tweak the up and down limit controls which are on the side of the motor unit.

Posted on Aug 16, 2009

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swolfinor
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SOURCE: Liftmaster garage door opener not working-flashing green lite

GOTO http://www.liftmaster.com/consumerweb/service/manuals

DOWNLOAD THE MANUAL FOR YOUR UNIT.

CHECK OUT THE DIAGNOSTIC SECTION.

HOPE THIS HELPS

Posted on May 29, 2010

blanchettohd
  • 143 Answers

SOURCE: Craftman Garaged Door Unit Stopped Working

This sounds like you will have to replace the logic board. Whether you repair or replace get a surge protector 900 joules or higher unless you want it to happen again. You can get replacement parts at searspartsdirect.com. Thanks BB

Posted on Sep 03, 2010

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Yikes! that sounds like the starter capacitor or starter relay.
Your meter must be able to show very low ohms to distinguish a short from a normal coil. Relay coils like that can be very low... like 10's of ohms.
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When that capacitor is bad, you will hear the compressor hum loudly and then click. If you are just plain mean you will wait a few minutes and it will do it again... but what you are doing is going to ruin you compressor when there may still be lots of life in it.
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Good luck and thank you for asking.

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