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Hi, I hope this is the right sub-forum. One of the SMD devices that I thought was just a PNP transistor for supplying 5v to LEDs turns out to be a BCR185W - PDF datasheet - which is a digital transistor. New to me. I wonder if anyone can explain things below to me in a way that my awkward brain can understand please? I did wonder why the faulty microcontroller on the control board had no resistor between its output pin and the base of the BCR185W and from what I can glean after reading a webpage all about understanding digital transistor datasheets (it helped a bit, but still don't u