"but since nothing works at all anymore it seems you have blown the processor and it must be replaced."
That's a pretty good idea, Jerry. I have done that with the TQFN package. The only problem is that if
the processor is blown, most likely the CH340P chip is blown also. In fact, the CH340P seems to be
more sensitive than the mcu. One has to replace that to get USB communication. However, the mcu
can be programmed with ICSP (if the traces are good).
Try re-programing at first, but If your Nano is wasted, get another; it is more effective in the long run
(and they are cheap enough to buy 5 at a time).
john
AD5YE
