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  1. PC & External PSU on the same power outlet, there...

    PC & External PSU on the same power outlet, there is 7mV between PSU GND and USB GND. Do You mention to cut off USB GND (or I misunderstand You)?

    My connection to external power and Teensy is good...
  2. You are right: I was unsuccessfully cut VINVUSB...

    You are right: I was unsuccessfully cut VIN<>VUSB second time... For the bare eyes was clearly separated but it was'nt in reality as the mulimeter shows...

    I fixed my bad, now PSU not starts...
  3. I connected 3.3V to VIN and 3V3 on Teensy -...

    I connected 3.3V to VIN and 3V3 on Teensy - orange blinks, I'm happy.

    At the moment I connect USB cable cuses OverVoltageProtection in the PSU and PSU switch off it's power output. I'm unhappy :(...
  4. @PaulStoffregen: Thanks Master to enlighten me!!!...

    @PaulStoffregen: Thanks Master to enlighten me!!!

    I opened that "jumper" to separate VUSB and Vin. (to separate VUSB to 3.3V converter part - I thought opening jumper is good idea)

    I hooked up...
  5. CUT means I separate Teensy's inner parts from...

    CUT means I separate Teensy's inner parts from 5VUSB->3.3V->Teensy with a cut on PCB indicated by a heirline red line. And then I try to feed 3.3V from a PSU.
  6. I can't understand this Pin 5-6 thing. I even not...

    I can't understand this Pin 5-6 thing. I even not soldered a pin to that "pins" (holes)
  7. I did not touched any part of Tennsy other than I...

    I did not touched any part of Tennsy other than I soldered a minimal amount of pins (MISO was unnecessary for this OLED) - and no, I'm absolutely sure in that I did not touched PRG PIN (as any other...
  8. Thanks for the tips. I did the 15S button press...

    Thanks for the tips. I did the 15S button press without any effect. Of course I immediatelly pulled out Tennsy from the breadboaord. Windows does not play a sound-affect as I plug it in the PC, and...
  9. @Frank B - on the "plan" I did but no in real...

    @Frank B - on the "plan" I did but no in real life! See photo: a socket soldered to 5V USB which is NOT connected to ground (I writing this 3th times). Not really visible well on the photo but VUSB...
  10. As I wrote in the initial post: I did NOT shorten...

    As I wrote in the initial post: I did NOT shorten 5V USB to GND (as seen on the cited "plan"). A socket soldered over teensy, it's bottom part is not contacts the breadboard. I thing USB port also...
  11. Thank You very much! No shortcut around soldered...

    Thank You very much! No shortcut around soldered 5V USB.

    I verified all the pins on OLED panel and no more than 3.2V, even when VCC=5V
  12. I did not played with 3.3V out of Teensy - I...

    I did not played with 3.3V out of Teensy - I thought that 5V USB will do the job as the SSD1306 manual says (if I interpreted well).
  13. Of course I immediately removed Teensy from the...

    Of course I immediately removed Teensy from the board - no any sign of life :(
  14. Feedback? No any SSD1306 output connected to...

    Feedback? No any SSD1306 output connected to Teensy input - isn't?
  15. Attempting to connect an AliExpress 1306 OLED to Teensy 4: insta-death :(

    My HW developing career just downfall at the first project :(

    I plugged USB cable to this Tennsy 4.0 before and it's blink example just ran nicely. After I plugged to this bread-board circuit it...
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