hi plkease help me i had powered my arduino with 14.4 volts and something burned out i am unable to identify what was that the board is not working the led on the arduino only glows when it is powered from usb cable from the computer .please tell me which part is burned i think the 5 volt regulator is burned out but i am not sure that the atmega chip is working or not
Make and model of your Arduino board?
Also if you could post photos of the board showing the parts that look burned or damaged then we could help.
14.4 volts shouldn't damage a board. Most Arduino boards are rated to accept up to 15V from the power input jack. I have often operated several boards on a 15V power supply without any issues. Examples: Arduino UNO, Adafruit Metro, SparkFun RedBoard.
However, one thing that will instantly fry most boards is connecting a power source that has the wrong DC polarity. The inside pin (middle pin) of the power supply plug must be positive. This is usually identified on the power supply label, although it might be in very fine print.
Best regards, E