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[on:]

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?

-Antzy

[Reply #1 on:]

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.

[Reply #2 on:]

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.