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Topic: Arduino Uno power problems (Read 504 times) previous topic - next topic


I need your help. I was working with my Arduino Uno and than it stopped working. I found that the green power LED is irregularly blinking. So program inside Arduino is starting over and over and never get to anything. I changed USB cable, tried others USB ports on my PC, but still the same. Also when I check Devices on PC, Arduino is blinking that is conected for a while and than not. All that means that I cant upload a new program.

I havent found any damage on the board itself. Can it be caused by dust?

Thanks for replies


do you have a mains converter to usb? if so try plugging that up to the arduino. It will test your usb socket on the computer.


Can your measure the 5v pin?



Well, I tried every USB port on my computer with Uno - still same - and than I conected Arduino Mega and that was OK. So, I pressume that something is wrong with Uno.


Is anything feeling hot on the card? There is resettable fuse in series with the USB power - if something on the card is running  hot, that fuse could be tripping, cooling off and resetting, then tripping again.
Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.


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