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

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Apparent internal short

Craftsman model 139.53982SRT. Periodically loses all power including green light on the wall-mounted control. Can be restored by tapping sharply on the side of the motor unit case. I have checked all external wire connections. Could it be a loose component on the board?

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Absolutely. You need to pull the board and check for loose connections especially around the small transformer. Some are hard to see and you might need to just touch it up with a small soldering iron.

Posted on Jun 19, 2009

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