Note that the Rx and Tx LEDs are not connected directly to digital pins 0 and 1 on the board (marked Rx and Tx). Rx and Tx LEDs (yellow) - these indicate if the USB chip (Atmega16U2) is receiving or transmitting.Indicator LED (yellow) marked "L" - connected via an op-amp to digital pin 13.Voltage regulator - this converts incoming power from the power jack to 5 V.Atmega328P processor - this is the "main" processor which has your sketch on it.Atmega16U2 processor - this handles the interface to the USB connection.It has multiple major components, and possibly only one has failed (if any). Īn "Arduino Uno" is not just one thing that might fail. Unfortunately that particular one had a SMD (surface mounted) processor chip, so it isn't easy to try swapping it with another chip. I've got quite a few Arduinos, and over the last few years have only ever "bricked" one, and I think that was by zapping it with static electricity.
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