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

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