Reply To: OSSC 1.6 Not Turning on?

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As far as i remember (someone correct me if i’m worng), the voltage regulators U5 and U6 are directly connected to the 5V input. So it’s very likely you’ve fried one of those two by connecting the wrong power supply.

D5 is TVS diode that clamps voltage to 5V (in reality effective clamping voltage is a bit higher and depends on current), protecting from surges and overvoltage. When continuous overvoltage (or negative voltage with more than ~0.6V amplitude) is applied, it burns into a short circuit so that downstream devices are still protected. That eventually triggers overcurrent protection (e.g. fuse) if such is present. The diode and fuse are placed before power switch, so if you hadn’t power turned on yet, then you almost certainly did not damage anything but the diode.