I got a non-working UNO. Loop-back test checked out so I know the cable and com and the built in 16u2 is fine. I swapped '328p chip for a known good one, it still doesn't work, Arduino can't communicate with '328 chip at all. I've checked, there is no short, resistor and caps checked out, reset lin…

Repairing UNO shield, resonator question

6v6gt October 10, 2017, 12:19am 4

You are sure it is not a problem with the bootloader which you would anyway have to install on the replacement Atmega328p chip ?

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