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    strange problem with SKR Mini E3 V1.2

    Hello All,

    I'm wondering if anyone else has had this problem: When I connect the board to a PC with the USB cable only (so the board is powered by USB), the board appears as a COM port and it works as expected. If the board is powered with the main Vin supply, the it connects but Windows reports it as an unknown USB type and therefore it does not appear as a COM port. The same strange behavior exists if I connect it to a Mac. I've studied the schematics and can't see why the difference in power source should have any affect at all. Any thought are appreciated - thanks!

    Regards, Jon.


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