Allentown, PA
Just a thought, did you check the circuit breaker? In my house, the garage doors have their own breaker.
(Topic ID: 225951)
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Quoted from PinMonk:I thought maybe that black 4 lead part was a fusible link or something, but I looked up the part number and it's a bridge rectifier.
The device PinMonk is referring to, D2, can easily be tested. It basically the same as a bridge rectifier on the WPC driver boards. Here's a link to the datasheet: https://www.vishay.com/docs/88573/dfs.pdf. Just use your DMM in diode mode to see if the 4 diodes are still intact.
Also, U3 is LM317 voltage regulator - just check the output voltage.
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