It took me about 4 hours to desolder an Arduino Nano I fried and solder on the new one. I'm not exactly sure how but I shorted it somehow while trying to install the nano onto my robot. I could smell a fait burning and the nano no longer powered on or allowed me to upload code via USB.
When I put the second nano on, before properly insulating exposed wire, I fried it again!! This time I actually saw a little smoke and quickly unplugged it. The nano no longer responds to the USB, but...
I have this nano also being powered by an Arduino Uno. When I turned on the battery connected to the Uno, the Nano turned on and everything was working fine!! I was pretty relieved after a short spout of depression! I plugged in the USB to the Nano and I was able to upload code... only with the nano being powered from the Uno. If I turn off the battery to the Uno the Nano doesn't work with USB.
I have no idea what happened exactly and I'm not sure what fried on my Nano but I sure am glad I have this work around instead of replacing the Nano again!
Does anyone know why it's doing this? What did I see smoking? Is it repairable?