Question about Sears Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+
My 1/2 HP Model 139.53641SRT opener clicks to all my remotes open button (I have no wall mount) but the motor does not move. The LED next to the green "Learn" button blinks 5 times and pauses for 2 seconds continuously after I hit the open/close button on my 3 button remote model 139.53779 (LED does not blink right after I re-plug in AC power). http://ths.gardenweb.com/forums/load/garages/msg012015459574.html indicates a 5 blinks is a diagnostic for ""RPM sensor or motor overload".
I verified obstruction sensor works and aligned. I also opened the opener housing and verified the motor gear to be fine. Is there anyway to checkout the motor and the RPM sensor?
(Right before the opener stops working, I open the garage door and accidentally hit a button on the 3 button remote that I normally don't use to close it about 5 minutes later and the opener started to act that way. I tried holding the same button for 2 seconds just in case that is the "locked" button for vacation and the opener still behaves the same. I wanted to make sure that I did not accidentally lock up the opener by hitting a wrong button on my remote and end up replacing the opener if someone out there can tell me how to unlock it. I have no owner manual because the opener and remotes came with the house.)
Thanks for your help.
I also had a bad solder connection on the logic boardi resoldered it and now it works fine
Posted on Jun 15, 2012
I had this problem and it turned out to be one of the solder joints on the logic board had gone bad. Symptoms: heard the relay click when the button was pressed then followed by 5 flashes of the green LED. Light bulbs did not light at all. Verified motor wasn't spinning so the RPM sensor probably was working. Tested motor in both directions and it worked. Pulled logic board out and saw the bad solder joint behind one of the relays (solder joint wasn't full could see the hole in the circuit board and the lead from the relay coming through). Cleaned off the joint and relay lead a little with a razor blade then resoldered the joint. At that point the garage door began working again.
Posted on Apr 12, 2010
First off, hitting extra button on remote would not do anything. Is door up or down/ where is trolley that attaches to chain, by door or motor. Is is jamned against a bolt. Try a paper clip and jump from white to read terminal. Does it work. Does light bulb blink 10 times. I ignore the diagnostic lights and go by symptons. Give more info.
Posted on Feb 12, 2009
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Posted on Jan 02, 2017
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