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Topic: Uno Fritto? High voltage to 6 unmarked pins. (Read 255 times) previous topic - next topic

JayF

Hello all,

I've been doing my best to avoid posting on forums while learning Arduino, but I could really use some advice now. 

After having just successfully driven a 12V fan with a MOSFET for the first time, I tilted the board to see the pin numbers (instead of just leaning forward) and touched the 6 unmarked pins next to the disconnected USB port, which I believe to be the ICSP pins for the 8U2 USB-serial convertor chip, against live exposed solder carrying 12V from a PC PSU.  Several or all of the LED's lit up, which alerted me to my stupid mistake.

Now, when I connect the USB, the On and pin 13 LED's turn on, but when I try to upload a sketch the Rx light briefly flashes three times and about 10 seconds later I get the error:
     avrdude: stk500_getsync(): not in sync: resp=0x00

My question is:  Although I understand it might be possible to reflash the firmware for the 8U2 chip, is it likely that I have fried it completely with 12V and should I just order a new Arduino now?

Thanks,

Jay


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