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I had this problem recently on a 20 year old Craftsman opener.
Found a Youtube video that suggested replacing a small capacitor on the board. Although the capacitor was not "swollen" like they get when they're bad, it did measure the wrong capacitance.
I replaced the capacitor for a couple bucks and all worked again.
I've got no idea if this works for your opener, but capacitor failures are pretty common and may apply.
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