Accidentally shorted 5V to GND on Arduino Nano, can I reuse the ATmega328p? 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?
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.