I've shorted 5V to GND and the Arduino Nano (CH340 clone) stopped working (power LED light is dimming). The board had a burning smell, and I also checked if other Arduini on the same USB port worked and they did, so I'm quite sure the Arduino is dead.

After the incident, I de-soldered the TQFP Atmega328p (plus the crystal) to reuse. I'm thinking that if it's only the external circuitry that's damaged, then the chip should be OK. Can I reuse the chip if I solder onto a new board? What components could have been damaged?

  • It always depends where you created the short circuit. If it was the VCC and GND pin of the ATmega, then you fried everything else but the MCU.
    – Kwasmich
    Jul 25, 2018 at 9:17
  • The short circuit was near a class D amplifier which I had misplaced on a breadboard. The amplifier and other components survived, only the arduino stopped working.
    – Emerson
    Jul 25, 2018 at 9:22
  • Can you show the schematics?
    – Kwasmich
    Jul 25, 2018 at 9:25
  • I don't have the schematics for this, I was just testing a few things. It's was a simple circuit though, just a mp3 player module, some LEDs and the PAM8403 amp.
    – Emerson
    Jul 25, 2018 at 9:26
  • Just draw a picture, how you wired up all the things.
    – Kwasmich
    Jul 25, 2018 at 9:27

1 Answer 1


On a Arduino Nano, there is a diode that prevents an external 5V source from back feeding into the USB source. If your clone equivalent has that as well, I suspect that is the part that got fried.

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