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Author Topic: ALL Pins On Arduino Fried?!  (Read 444 times)
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Hi everyone,

I was using my Arduino Uno for a project to read from a remote control and operate a servo motor. The servo I have is a 12V one, with 5 pins, the usual three, and two more to power the sensor (+5V and GND).

Now, I'm not sure what I did wrong, but after building the circuit when I uploaded it, nothing on my breadboard was responding. So, after trying pretty much everything, in exasperation I connected an LED without a resistor to the +5V and GND pins. Sure enough, the sweet smell of a burnt LED filled the room and it had to be thrown in the trash.

However, nothing seems to be working on the Arduino anymore. The chip is still working I'm sure because the "on" green light is still on, and when I run the blink sketch the inbuilt LED does flash. But I cannot get any output from either the 3.3V, 5V, or any of the digital pins.

Are the pins all gone? More importantly, do I need a new Arduino now?

*Fingers crossed*

Thanks for any help.
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Massachusetts, USA
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The chip is still working I'm sure because the "on" green light is still on, and when I run the blink sketch the inbuilt LED does flash. But I cannot get any output from either the 3.3V, 5V, or any of the digital pins.

Since the LED used by the Blink sketch is connected to Pin 13, perhaps it is your measuring device that has failed.  It should se Pin 13 switching from 0V to 5V as the LED blinks.
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How can you not get 5V out if the chip is running and making D13 blink the LED? The uC is powered by 5V.

The Power LED is also powered from 5V.

Any signs of damaged traces?
Does the uC feel hot to the touch? That's usually a sign of a chip that's on the way out as well.

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I think maybe you are testing the pins with an LED you burned out by not using a resistor.
Try a different LED (WITH RESISTOR!!) or a voltmeter.
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