i think I fried my Arduino Nano


Somebody could help me on diagnose this? I was trying to power my nano with 12v and use the 5V and 3.3V output at the same time.

The Fritzing schematic is attached.

I don’t know if I did something wrong that caused a short circuit. I was starting to put the jumper cables and check the voltages with a multimeter when I smelled burnt from the chip. The USB was not connected at that moment.

Now when I connect the nano to the USB power the 3 leds keep ON and the PORT does no appear on PC. It looks like the USB driver has burnt.

I need to use the 12V to control an TB16612FNG to drive two computer Fans. The 5V to power the TB16612FNG and 3.3V to OLED.

I just want to know if this configuration is OK and I just made an mistake on wiring that cause some catastrophic short circuit.

Maybe I can not use it that way and I’m not understanding how the arduino power supply works.

I would be very grateful if anyone can help me to solve this question.