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How to test if a ATMega16u2 is working

You should to remove your IC from the board, and check continuity between VCC and GND pins. If you have continuity then that IC is dead. Also, a short current can appear between any other pin, GPIO, ...
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How to test if a ATMega16u2 is working

Your MCU has USB interface but it does not do anything without a program to use the USB interface. If the MCU has no program loaded to use the USB interface, it will not do anything if connected to a ...
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