What to do with a non-recognisable Arduino board

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Hi all,

I have a genuine Arduino Mega 2560 which can only provide power from the 5V pins when connected to the computer via the USB cable. I suspect that I fried the board as it does not appear in device manager when changing USB ports or cables.

However, the ON and 'L' LEDs can light up. When attempting to upload a program via a working Arduino board, I keep getting error messages with device signature 0x00000. Since I have not been able to upload a program to the fried board, should I dispose of it?

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So when powered via barrel / Vin, there is no 5V output? If so, your 5V regulator died.

That indicates that the TTL-to-USB converter is damaged.

Which approach? Using the working Arduino is a TTL-to-USB converter or using the working Arduino as a programmer (Arduino-as-ISP)?

If you used Arduino-as-ISP when you get that message, you either have a wiring error or your 2560 processor is damaged.

Based on above and assuming no wiring error, your board is good for the bin. Think about your sins so you can try to avoid this in future.

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When I power the board with the Vin pins, the 'ON' & 'L' light up. Using a voltmeter, I found that the 5V pins still work. In my last uploaded program, I set pins 9 and 12 as output. It seems they still work.

I used another Arduino Mega board (CH340 version) as an ISP. The error message showed a target and reference voltage of 0V. But I'll probably dispose of the dead board.

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