After doing some troubleshooting research I recently removed and replaced the capacitor with a new one, and the old capacitor has a date on it of "April 1988"... pretty old (it's an old house and I've only lived here for 2 years). The P/N number on the capacitor is 30B0363, 220vac, 53-64 mfd. (I don't know what those numbers mean but I figure the more info the better.) So after I installed the new capacitor, the opener worked perfectly for about an hour - button worked, remote worked, car remotes worked, etc. Then a little while later it wouldn't respond again! So, naturally, I did what any sane person would do: in frustration I smacked the motor body of the opener and then it started working... it would open when I pressed the button. That was last week, and now everytime I try to open the garage door, it won't respond unless I give the opener body a light tap with my hand Very confusing, but interesting that it responds immediately with a light tap!!
So I have no idea. My thought would be a loose connection somewhere? I didn't look too closely at the circuit board, but at a glance it didn't appear to have any glaring problems. The weird thing is the opener will respond the same whether I press the wired button or the remote control - if I tap the body of the opener, the garage door will respond to both the button and the remote. Then after a while it won't respond (unless I tap it again).
Any thoughts?? I tried to give as much info as possible (and sorry for the long post) and thanks in advance for any ideas you might have.