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Pi Zero Current Draw
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Pi Zero Current Draw

by rocketguy on Thu Sep 13, 2018 10:42 pm

My poor Pi Zero W has too much current draw.

I reported to Adafruit support that my PiZero W was drawing too much current. I was driving it with my lab power supply for a first turn-on. Set to 5 volts it immediately went into current limit at turn-on with the PiZeroW connected. The supply was current limited at 500mA. When the overcurrent LED on my supply came on, I immediately turned it off.

Well, there must be a short. I had it on the Pi Cobbler for the Zero and looked for clues there. No issues with the cobbler, shorts etc. Disconnected from the cobbler, I supplied 5V directly to the header pins on +5v and Gnd. Same result. Ok, so there must be an internal short somewhere, I'll tell Adafriut.

Well, got this response:


Adafruit Industries
3:07 PM (4 hours ago)

to me

Hi Steve,

Thanks for the note.

Please look here for some information on how to get your zero w up and running:
https://learn.adafruit.com/introducing- ... -zero-dead

Against my better judgement, I thought, well maybe it takes over 500mA for a short period, then settles down. (is-my-pi-zero-dead suggests connecting it without the mico-SD card and plugging it into USB on a pc to see if the USB driver is alive.)

BAD IDEA. Without the current limit, the cpu chip gets extremely hot and the smell of blue smoke appears. I disconnected it well before the actual smoke escaped.

The suggestion of using the USB to see if the PiZeroW is alive may be a good one, but not if you suspect a short or over-current on the Pi.

Suggestions welcome, but I feel my Pi is very dead.

rocketguy
 
Posts: 4
Joined: Wed Jun 15, 2011 6:43 pm

Re: Pi Zero Current Draw

by adafruit_support_mike on Fri Sep 14, 2018 12:22 am

Yeah, any time you smell smoke it strongly suggests you have an ex-RasPi.

When did you get the board?

adafruit_support_mike
 
Posts: 53624
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Re: Pi Zero Current Draw

by rocketguy on Fri Sep 14, 2018 1:04 am

I ordered the board on July 24. I'm developing on a standard Pi zero, and did not need to test onboard wifi until now.

rocketguy
 
Posts: 4
Joined: Wed Jun 15, 2011 6:43 pm

Re: Pi Zero Current Draw

by adafruit_support_mike on Sat Sep 15, 2018 2:15 pm

I’m sorry, but that’s past our 30-day reurn/replace period.

adafruit_support_mike
 
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Re: Pi Zero Current Draw

by rocketguy on Sat Sep 15, 2018 2:22 pm

Ok. Thanks.

rocketguy
 
Posts: 4
Joined: Wed Jun 15, 2011 6:43 pm

Re: Pi Zero Current Draw

by rocketguy on Sat Sep 15, 2018 2:23 pm

Ok. Thanks.

rocketguy
 
Posts: 4
Joined: Wed Jun 15, 2011 6:43 pm

Please be positive and constructive with your questions and comments.