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

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Transmitter on logic board replacement

Can transmitter on motorlift garage door motor be reploaced or new logic board or unit required

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  • tony513 Aug 02, 2009

    my opener is a motorlift ml 700
    I have replaced the logic board reciever and remote it works sometimes and sometimes not.same as before Even when remote is near transmitter.I have checked all settings and still the same.Gratefull for a solution it has wsorked fine until recently.

  • tony513 Aug 02, 2009

    i dont think there is a lock button on the ml700 is there

  • Don Maggard May 11, 2010

    Can you give the model number and explain exactly what your problem is?

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Most likely a new logic board will be needed.

Posted on Jul 29, 2009

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Where is the lock button on the 973LM

Posted on Aug 02, 2009

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Door will not operate unless you hold down button


I am presuming the following: is it that the door will not operate unless you hold down the button to "close the door"? And the button you are pressing is the hardwired wall button or control inside the garage correct? And if you try to close the garage door with the remote the overhead lights flash off and on or the motor make a clicking sound (about 5 clicks?)
The problem is either an obstruction of the safety sensors at the bottom of the door or, one or both sensor eyes are out of alignment. If you look closely at both safety sensor eyes on the part that faces into the garage, you should see a glowing LED. One side will be an Amber color and the other Green. If one is lit (amber) but the other is not (green), that is an indication that the beam is not being received by the receiving eye (amber).
If there is no obvious obstruction (check for spider webs, dust, try cleaning the clear lenses facing each other, etc,) Try re-aligning the sensors. When they are properly aligned the Green LED will be lit. Now, check the motor for operation.
If you have difficulty getting the transmitter eye (green LED) to light, try closing the door at the wall button, then, pull the red emergency release handle to disengage the door.
Now, try operating the motor unit with the door disconnected while using the hand held transmitter. If the motor unit operates to the close position while the door is closed but not when opened, then that sounds like there is sufficient light entering the garage to "Wash" the transmitter beam out so the receiving eye does not get it.
Contact Chamberlain/Liftmaster for Sensor eye blinder shields that can be easily installed by you. (they just snap on) If neither LED is lit, make sure that the wire to the sensor(s) has not been cut off at the sensor itself. If that checks out, check the connection at the logic board. Make sure that both wires are securely connected.
If after checking all of that, and you do not have either of the LEDs on, then disconnect the safety sensor wires from the motor unit's logic board. Then take a 2" piece of bell wire and jump it across the two terminals for the safety sensors. If the unit operates normally when using the hand held transmitter, then the problem is likely: a) Bad safety sensors b) Broken wire to one or both sensors
To check if the safety sensors are good:
Remove both sensors from their mounting brackets. measure about 8" to 12" of wire from the back of the sensors and cut. You should have about 8 - 12 inches of wire on each. Now, separate and strip the insulation from each and then match the white striped wires and twist them together, and do the same with the solid non-striped wires. Take the sensors up to the motor head and connect the spliced wires to their respective positions on the logic board. Now, Point the two sensors directly at each other (its okay if the clear lens part are touching each other) Check if both LEDS are now lit. 1) If YES; then the sensors are good, the wire to them is broken somewhere; [FIX] replace the wires for both sides. 2) If NO: then the safety sensors need to be replaced. [FIX] Replace the sensors, contact Chamberlain / Liftmaster for replacement parts. You will need your garage door opener's model # which can be found under the light bulb or light fixture on the opposite side of the logic board. Having the model # speeds up the parts search for you.
I hope this helps you out. [I have been factory trained on residential and commercial garage door openers by Chamberlain / Liftmaster and have been providing installation and tech support on them for over five years. Prior to that I used to install and repair these units, and I've done that for nearly seven years.]

May 18, 2011 | Chamberlain & Liftmaster Garage Doors

1 Answer

Hi, My g. door opener doesn't work. The


5 Blinks on the logic board LED indicates that possibly the motor has overheated. If you have unplugged the unit and waited minimum of 30minutes before plugging it back in, and it still will not operate, then the logic board will need to be replaced.
I hope this helps

May 12, 2011 | liftmaster Chamberlain Garage Door Opener...

1 Answer

There is power to opener, but when wall unit or remote pressed door will not open. Also when light button pressed on wall door control panel lights do no go on


Sounds like you may have a bad logic board in the motor. Try to reset the motor by unpluging for 30 seconds then plug back in to reset, if this does not work replace board
Also Make sure that you do not have a broken spring at top of door.

Sep 30, 2010 | liftmaster Chamberlain Garage Door Opener...

1 Answer

Liftmaster Chamberlain Garage Door Opener Transmitter 300MC: Light keeps on flashing on the motor...


how many flashes
1-safety sensor wire broken
2-safety senor wire shorted or reversed
3-door control or wire short
4-safety sensors mis aligned
5-motor overheated or bad RPM sensor
6-circut failure, bad logic board

May 17, 2010 | liftmaster Chamberlain Garage Door Opener...

1 Answer

Last weekend I installed a new craftsman garage door opener. Twice now the garage door has opened on its own. The first time, I thought it might have been activated by one of my neighbor's remotes, but...


There may be an electronic short in either the wall control button or the receiver logic board. In this case, remove the wall control wires from terminals 1 and 2 on the motor unit. Should the symptoms persist after the wires are removed, replace the receiver logic board. If the symptoms stop with the wall control wires removed from the motor unit, replace the wall control button or the wires leading to the wall control button.

Make sure none of the staples have cut through the wires leading to the wall control.

Apr 17, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

I've got a Sears/Craftsman 1/2 HP garage door opener. It's older, it was in the house when I bought it 11 years ago -- model #139.53600 The door will open when I press the pushbutton inside the garage,...


If you have the wall control with 3 buttons one of them is the lock button. It is not on the side. If you have it and the light in the wall control is flashing, press and hold the button with the lock icon for 3 seconds and release. If that is not the situation your receiver is bad. The receiver is inside the motor unit and is part of the logic board.

Dec 29, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

GDO - Do I need a new Logic Board or is it something simpler?


No, the problem is the photoelectric eyes. Check that they are properly aligned.

Aug 02, 2009 | Kitchen Appliances - Others

1 Answer

Motorlift garage door remote range


Your receiver is going bad and should be replaced. It is part of the logic board.

Jul 19, 2009 | Sears Craftsman LiftMaster Chamberlain...

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