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Before seeing this error I did a project with my Uno board using a Bluetooth module.

After that, when I powered the board to upload another program, 4 LEDs (L, TX, RX, ON) went red without blinking.

So now, every time when I power up my Uno board, without any connection with any of the pins previously mentioned, the 4 LEDs are red coloured all the time.

ocrdu
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Brown
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1 Answers1

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If you can upload sketches, I don't think it is that big of a deal but if you can't, check the TX and RX pin tracks since if those tracks are shorted, they can keep the indicator lights on for ever due to the Serial code on the Arduino. To get further help, please tell me what happens if you try uploading code.

DragonflyRobotics
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