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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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  • are you able to upload something, like a "blink" sketch to board ? – Tirdad Sadri Nejad Mar 23 '20 at 20:44
  • There may be good reasons, that the LEDs are on. That's not directly an error. Are you still able to upload programs? What happens, if you upload the blink example? – chrisl Mar 23 '20 at 21:01
  • When I tried uploade the blink example it's not uploading to the board,it says there a touble shooting problem. – Brown Mar 24 '20 at 04:28
  • Please give us the full error message (add it to your question by editing it) – chrisl Mar 24 '20 at 08:21
  • If the LEDs are red then it's not a genuine Arduino. If it's not a genuine Arduino then all bets are off as to what happened. – Majenko Mar 24 '20 at 11:17

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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