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I recently had a failure on my OpenSprinkler v3.2 AC model after many months of reliable operation. I traced it to a shorted D2 Schottky diode on the output of the 1509 regulator on the power board. That’s the freewheeling/flyback diode for the buck convertor. Has anyone else experienced this problem? Any ideas as to cause? Mains power is usually pretty clean in my area, so I have no particular reason to suspect external spikes. Also the 1509 regulator and other PS components are fine.
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