A few days ago I got a mega 2560 r3 ( SainSmart ) which did not work, it was not detected when plugging usb to pc. Although I have very limited knowledge of electronics I tried to detect its failure. I started with a multimeter at least corroborate some volts and continuity observing schematic. Sudd…

mega 2560 r3 only works without one of 22p caps of crystal of atmega16u2

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