Our Liftmaster keyboard has been in use for about 17 years, the keyboard once stopped working. So I changed the PIN to require different keys. This change worked for about eight years. Recently, the keyboard has been unreliably activating the opener. A YouTube video recommended improving the connection between the keyboard and the 9V battery. Specifically, the solution was to gently tap the centers of the two circular clips that attach the 9V battery to the keyboard. It worked! But to do this I had to remove the keyboard from the door frame, in the process damaging the plastic hinges that secure the keyboard cover. :-( Bad. I considered putting in a new hinge/lid but decided against it. So I read reviews of the LiftMaster 877 MAX, noticed that the button on our Chamberlain opener was coded red, and the Instructions followed (attached to the inside of the lid) that came with the new keyboard. In two minutes I adapted the keyboard to power the opener; in five minutes I installed the keypad on the door frame. Pretty easy and plenty of time to get a snowblower ready for the winter!
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