With a very heavy heart, I'm requesting for help. Today while working on a project, I was making a few modifications to the circuit made with Arduino Uno R3. It was a bit dark and I mistakenly inserted the ground wire to Vin. So basically, there was 260 ohm across 5V and Vin pins. The microcontroller got realllly hot and I realized my mistake and unplugged power within 30 seconds. I let it cool and then plugged it into a PC. The power light comes on but computer doesn't detect anything connected.
So can anyone please help me find out whether the board is fried for good or only the chip?
The power LED lights up so the 5V supply is probably fine. Since the PC doesn't recognize the board there is probably something wrong with the USB-to-Serial chip. If you are lucky it's just a small matter of programming. Search for "DFU Arduino" to find out how to refresh the firmware in the USB-to-Serial part.
Thanks. I'll try DFU...
Btw, any way to check what is wrong? Or hypothesize what would have probably blown?
I tried the general testing loopback circuit but no port comes up when I connect arduino.
And why did the arduino guys put Vin pin at the end after ground pins? That is really deceptive.
I know this is now pretty old topic but I came about to fix my Arduino which I fried and want to help anyone viewing this in future. I programmed a new ATMega328 with Arduino Uno bootloader and replaced the damaged AVR chip. Then I proceeded with DFU programming. If anyone is facing the same problem, here are the links:
I had a R2 board, so there were no pins in the back to solder. So the instructions don't say what to do in that case. I found this topic about the same problem: http://forum.arduino.cc/index.php/topic,61100.0.html