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Greybie, there were 2 traces that were gone up to the MOV. Otherwise the board should work. The transformer seemed to be OK. Wouldn't know for sure until I repair them, and give the board back to the guy that blew it out. He is 200 miles away in the Northwoods of Wisconsin, where they work on live c...

Edd, I forgot to mention that 2 traces, hot and neutral were burned up to the MOV. It looks like it protected the input to the transformer. Go figure.<p>Thanks for all of your help too.<p>Baseball strike????

And EDD, it is glossy red, and about 3/8 " dia.<p>Could be the part you mentioned.
Also, it is possible he shorted it to 220v too. Who knows. The guy never works with the power off. One of these days.

All 3 of you gave great answers, I will check them all out. It now does sound like an avalanch diode, but the side that blew had the markings. also, if someone in the hood has a chanberlain opener that would be easy to check too. And last, they should be able to read the darn part from a new board. ...

I have a burned chamberlain garage opener logic board. The part which is D12 (diode) is burned and can not read the part. It looks more like a small red cap., the silk screen shows no anode or cathode placement. Company has no parts #'s only new boards. This part is in-between the hot and neutral wi...