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  1. That trace on the PCB is persistent! Odd,...

    That trace on the PCB is persistent!



    Odd, with that trace cut the only expected path to PC is GND - is the external power on common GND and alright?

    I had an RGB LED display matrix running...
  2. Perhaps cutting the VINVUSB trace on the...

    Perhaps cutting the VIN<>VUSB trace on the underside will allow programming/SerMon for that Teensy when powered directly as above with 3.3V.
  3. As noted in p#19 - that isn't an issue - those...

    As noted in p#19 - that isn't an issue - those pads appears to ship unpopulated.
  4. Looking at the Card image and a T_4 in hand -...

    Looking at the Card image and a T_4 in hand - that part is not populated from the factory.
  5. Given indication the SSD1306 can run on 3.3V -...

    Given indication the SSD1306 can run on 3.3V - that would have assured only that voltage was in use around the 3.3V Teensy 4 - rather than feeding it 5v from VUSB.

    The i2c 1306's I've used were at...
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