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

3 Answers

Remote don't work at normal distances anymore (not the battery)

I have a Craftsman 1/2 (about 2 years old). The garage opener no longer recognizes the remote control units if you are using them at a normal standard distances (say...out in the driveway). This had never been a problem before, as I could open the door from a block away. If I stand directly under the motor housing in the garage w/ the remote, the motor will activate. I have already replaced the batteries in the remotes. The door does not "do better" with one remote verses the other. In addition, the external Security Keyless entry pad sometimes works and sometimes doesn't as well. The Premium Control Console (hard wired) always works when I push the button. I have "straightened" the antenna wire coming out of the motor housing. The motor housing LED is not lighting up or blinking to indicate any diagnostic info. while out in the driveway, I can sometimes get the door to open if I stand there long enough and keep pressing the remote button.

Any help would be appreciated since I don't want to buy a new logic board or oveall unit. Of course the warranty is out after a year and a half.

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3 Answers

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Hi and welcome to FixYa,

Offhand, based on your description, most of the usual suspects have been eliminated.

  • remote batteries - replaced;
  • remote itself - tried several;
  • Security Keyless Entry Pad - similar issue;
  • Premium Control Console - works;
  • antenna - "straightened"
  • diagnostic - no errors.
Keeping the in mind that the simplified operation of the garage door opener is:
  • battery/remote > antenna >>>> antenna > receiver > logic board > motor actuator > motor and that
  • under motor housing, remote will work;
the possibilities left are:
  • remote's internal antenna (very unlikely);
  • receiver antenna (likely);
  • receiver (most likely);
  • logic board (a possibility).
Things you can try:
  • replace/extend antenna;
  • check/re-solder antenna connection to receiver board;
  • check receiver board, specifically, the filter capacitor and/or if it is getting the correct DCV from the power supply unit.
Alternately (though a remote possibility), it may be spurious radiation/RFI from other wireless equipment within the immediate vicinity of the receiver such as wireless phone, Wireless Routers, CB/HAM/Amateur radio equipment, wireless surveillance equipment. As stated, a remote possibility only. To my knowledge, most versions/models similar to yours operates on 315~390 MHz or there abouts.

Good luck and thank you for using FixYa.

Posted on Jan 31, 2009

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Posted on Jan 31, 2009

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  • 51 Answers

One thing you could do, (as a Diagnostic approach) is:

  • Make the antennae wire longer. Do so by stripping the end off of the wire and twisting an extension on the end (speaker wire works well).
Try this, and see if the range improves a little. If it doesn't, maybe replacing the Antenna would solve the problem.

Another thing to do is replace the batteries in the transmitter (on the unit) [*if you haven't already done so..)

I wish you luck.

Posted on Jan 31, 2009

  • xiller8er
    xiller8er Jan 31, 2009

    Also, you could try the unplug, replug, reset trick..


    • One more Diagnostics test you could do is: With a helper;


    • Have someone push the remote from out in the driveway while you watch the LED by the learn button.


    • If it flashes when they push the remote, the logic board is probably bad.


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