Overpowering Arduino UNO through Vin

So, I mistook Arduino UNO R3 to have BEC and I tried powering it with 15Volts from a trainer board in our lab.

It ran for half a second and I heard something click and my Arduino died. I picked it up and it was really hot and it smelled a bit plasticy.
Current Status: Doesn't take power through any of the modes provided including the USB
Is my Arduino completely dead? Will changing the components onboard bring it back to life? Also, is there any hope of survival of the ATmega onboard?

alvays use 5v adapter (min 0.2 I) or USB (because it supplies 5v),So do you get lesson now Arduino Compeletely Dead you cant do anything go buy new one (sorry for speaking harshly)

If you mean it has a voltage regulator, well, it does.

If powering it with USB, and with no other components connected to the Arduino board, you cannot upload a sketch, it is probably dead.

The question is what else was being powered from the Arduino's 5V pin when you connected 15V to the Vin or barrel socket? If more than maybe 100mA was being drawn, then the voltage regulator probably burned and allowed 15V to reach the main atmega chip, killing it also. The onboard regulator is not able to deal with much power, enough to power the Uno itself and a few other low power components, but no more than that.

Or did you connect 15V to the 5V pin? That would certainly kill the atmega chip.

If you have an Uno R3, you could try replacing the atmega chip. This design of Uno has a socket for a 28 pin atmega chip, allowing it to be removed. You would need to buy an atmega chip which is pre-programmed with the Arduino Uno bootloader. You might then find that you can upload sketches to the board, but you cannot power it through the Vin pin/barrel socket because the regulator is blown.

You aren't the first. Try a simple serial printing routine (read A0 with nothing attached, for example, and print that to serial monitor) with the Arduino powered using the USB cable only.
Maybe you'll still have a use for such an Arduino, just write on the back that's it's the damaged one.

VIN voltage is 7-12v, I highly doubt that connecting 15V would have burnt it in half a second.

USB does not power the board according to @motasimfaiyaz. So upload will not succeed.

Which UNO pin did you connect 15V +, 15V -?

There is no reply yet, to the question about whether any loads were attached. That would do it.

also your unos all things are dead serial converter, RAM,ROM,SRAM,ATmega/Atmel,Some connections on PCB

(and the problem is you cant sell and buy a new one :(((( )

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