Reviving an arduino nano (After shorting 5v and GND)


Whats that smell you ask yourself, Thats when you get that awful sinking feeling that you have just released the dreaded white smoke. In my case it was my trusty arduino nano.

It became quite apparent from where on the board the white smoke had escaped after I pulled it off the bread board, See that small brown patch it had burnt on my bread board.


My heart sank, it really bugs me when I destroy something because of my shear stupidity. I had shorted the 5v pin with the GND only for a second but thats all it takes.


Here is the damage it caused, It only outputted 3.46v instead of the 5v it was surposed to.

Being the inquisitive hacker type Iam I started wondering if I could track down this part and replace it. Because the arduino is open source hardware they have the BOM and schematics (warning pdf link) for all to see.

After taking a quick look at the schematics nothing really stode out, But after a bit more looking I found out it was the +5v auto selector diode (MBR0520L)


Once I had narrowed it down I did a quick image search on the MBR0520L part to see if it looked like my blown part, It mached up. Next I had a look to see if I could snag the part off eBay in the single quantity’s, lucky for me I found a few on there so I ordered one.

This was going to be the smallest part I have soldered to date and it was in a awkward place too. I broke out my smallest soldering iron tip and my tweezers to ade me in the surgery. I managed to pull it off but it wasn’t pretty


But it did fix my problem


So there you have it, If you to short your 5v and GND on your arduino nano you know how to fix it. Hope this will help someone out.



6 responses to “Reviving an arduino nano (After shorting 5v and GND)

  1. Dear Sir,
    Excellent advice! Many thanks!
    I revived my Nano by using external power, but the suggestion was great, as I did not like to ”solder it out” (and power through USB is not really needed in this case).
    Kind regards,

  2. Good day Sir,
    I almost decide to buy a new arduino nano because i’ve nearly lost my patience. I felt so frustrated because i don’t want to throw money out of my hard earned income so i kept on searching in the web looking for the solution to fix my malfunctioning arduino nano(clone). i am very happy to see your post and i read your advices and applied it immediately. But the problem is the diode component is very tiny and difficult to work on, Anyway i tried and do trial and error to put the SMB M7 diode (alternative) because i don’t have the MBR0520L auto select diode. Finally i finished it and test it right away on my laptop and whoooowww! boom! problem fixed. I checked. the voltage now is 4.333VDC against 2.8VDC before.

    Thanks a lot for your advices, it was indeed a great help.

    Ronilito T. Mandin

  3. how can you solder such a small part..
    i mean my solder iron is so big

    • Hi, What kind of soldering iron do you have? I soldered this with a “standard” sized soldering iron with a 1mm tip. It doesn’t really matter what it looks likes as long as you get a good connection.

      You can do this

      Happy hacking

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