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Broken Rasberry Pi Zero W
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Broken Rasberry Pi Zero W

by NinjaPenguin on Sun Aug 01, 2021 6:23 pm

Around two weeks ago I received a servo, motor driver, and rasberry pi zero w in Order #2612737-6353105006. I soldered the servo without the signal wire to the motor driver, to the pi. The pi had a working version of raspian running on its micro sd card. However, when I tried to plug in the rasberry pi to create a program the small-mirror looking chip (I think wifi?) on the board would get very, very hot--burning if I kept touching it. The board itself would get warm, but the mirror-chip by far the most. I assumed I had created a short somewhere in the circuit, but all I saw was some small bits of residue. I tried taking the motor off, then the driver, but neither made any change. Then I desoldered all the wires, and completely cleaned the board of residue and solder. Still, with or without the sd card, the green power light would slowly flicker on and the metal chip would get very hot. The pi still does work when plugged into a monitor, but I never tried to run it too long in fear of frying or overheating the board. It's also too hot to touch or mount to a 3D print. I believe I received a defective board as all methods I have found of solving it have not worked. Let me know if you need any more information.
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NinjaPenguin
 
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Re: Broken Rasberry Pi Zero W

by adafruit_support_mike on Sun Aug 01, 2021 9:46 pm

A hot chip usually means there's a short circuit somewhere. It can also mean power was connected backwards, which is a specialized kind of short.

Did the Zero-W boot and run normally before you added the servo connections ('working SD' can mean one that worked in some other RasPi), and was the Zero-W connected to power when you soldered the connections?

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Re: Broken Rasberry Pi Zero W

by NinjaPenguin on Sun Aug 01, 2021 9:52 pm

I did not test it before that unfortunately although it still doesn’t work now despite it now having no wires or solder bridges. I am pretty confident that I did not reverse the wrong polarities, though not 100% sure

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Re: Broken Rasberry Pi Zero W

by NinjaPenguin on Mon Aug 02, 2021 9:01 pm

I also did not turn it on until everything was fully soldered.

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Re: Broken Rasberry Pi Zero W

by adafruit_support_mike on Mon Aug 02, 2021 9:53 pm

Did you power the Zero-W through the USB jack like normal, or did you connect external power to the GPIO header?

I’ve toasted more circuits than I like to admit by swapping loose power wires. Eventually I made it a rule never to connect power except through tested, keyed connectors. Every couple of months spend an evening wiring and testing male and female JST-PH2 pigtails. Then when I build a project I can just pull one out of the bin and hook it up.

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Re: Broken Rasberry Pi Zero W

by NinjaPenguin on Mon Aug 02, 2021 10:07 pm

I just powered it through the usb jack.

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Re: Broken Rasberry Pi Zero W

by NinjaPenguin on Mon Aug 02, 2021 10:09 pm

Sorry for the confusion, I was saying it was a small chance possibility that I switched the polarities of the servo power—not the board power.

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Re: Broken Rasberry Pi Zero W

by adafruit_support_mike on Mon Aug 02, 2021 11:16 pm

Thank you.

There’s no obvious way to short the Zero-W’s Wifi module when the board gets power from its USB jack, so I think we can write this one off as early component failure.

Send a note containing a link to this page and your order number to support@adafruit.com. The folks there will get you a replacement Zero-W.

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Re: Broken Rasberry Pi Zero W

by NinjaPenguin on Mon Aug 02, 2021 11:19 pm

Great, thanks for the help!

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