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Need 5V for my fan, pins covered by RTC?

Posted: Tue Oct 01, 2019 9:23 pm
by knute
I've got a Pi4 in a case with a fan and a RTC that covers pins 1-6. The fan needs 5V. Is there another pin or place to get 5V on the board? What about the POE pins? I thought as a last resort I could use one of the USB ports for power but that uses up a USB that could be used for something more interesting.

Thanks

Re: Need 5V for my fan, pins covered by RTC?

Posted: Tue Oct 01, 2019 9:33 pm
by trejan
knute wrote:
Tue Oct 01, 2019 9:23 pm
The fan needs 5V. Is there another pin or place to get 5V on the board?
No. Solder to the bottom of the Pi or top of the RTC. You've already mentioned powering it via USB.
knute wrote:
Tue Oct 01, 2019 9:23 pm
What about the POE pins?
No. That is where the PoE HAT gets the PoE power from. Those 4 pins are connected to the transformers in the Ethernet socket. It feeds the 5V in via the GPIO header.

Re: Need 5V for my fan, pins covered by RTC?

Posted: Fri Oct 04, 2019 9:26 am
by LTolledo
something like this (hint: not the GPIO extenders)
Extend_headers.jpg
Extend_headers.jpg (209.9 KiB) Viewed 793 times

Re: Need 5V for my fan, pins covered by RTC?

Posted: Fri Oct 04, 2019 9:35 pm
by knute
Did you solder that to the board?

Re: Need 5V for my fan, pins covered by RTC?

Posted: Mon Oct 07, 2019 12:37 pm
by LTolledo
yup!