ASCII8BiT
Posts: 7
Joined: Tue Dec 03, 2019 11:22 am

RPI4 Back Solder Pads

Mon Jan 13, 2020 7:15 pm

How do I supply energy from the back pads? Which one is for what? Where i can find that diagram?

klricks
Posts: 7135
Joined: Sat Jan 12, 2013 3:01 am
Location: Grants Pass, OR, USA
Contact: Website

Re: RPI4 Back Solder Pads

Mon Jan 13, 2020 7:37 pm

ASCII8BiT wrote:
Mon Jan 13, 2020 7:15 pm
How do I supply energy from the back pads? Which one is for what? Where i can find that diagram?


https://www.raspberrypi.org/documentati ... educed.pdf
Unless specified otherwise my response is based on the latest and fully updated RPiOS Buster w/ Desktop OS.

ASCII8BiT
Posts: 7
Joined: Tue Dec 03, 2019 11:22 am

Re: RPI4 Back Solder Pads

Sat Jan 25, 2020 12:31 pm

klricks wrote:
Mon Jan 13, 2020 7:37 pm
ASCII8BiT wrote:
Mon Jan 13, 2020 7:15 pm
How do I supply energy from the back pads? Which one is for what? Where i can find that diagram?


https://www.raspberrypi.org/documentati ... educed.pdf
I may be wrong but TP1, TP2, TP3 for VCC (Power) ; TP7, TP8 TP9 and TP12 Ground Pads. Am i right?

hippy
Posts: 7459
Joined: Fri Sep 09, 2011 10:34 pm
Location: UK

Re: RPI4 Back Solder Pads

Sat Jan 25, 2020 7:31 pm

ASCII8BiT wrote:
Sat Jan 25, 2020 12:31 pm
I may be wrong but TP1, TP2, TP3 for VCC (Power) ; TP7, TP8 TP9 and TP12 Ground Pads. Am i right?
Looks correct according to the schematic I have.

You can use a multi-meter to do a continuity check on a completely disconnected Pi, between the pads and GPIO header pins, to check they are and to ensure you have located the correct pads.

It's always worth doing that double-check.

drgeoff
Posts: 10676
Joined: Wed Jan 25, 2012 6:39 pm

Re: RPI4 Back Solder Pads

Sat Jan 25, 2020 7:50 pm

If you are going to solder to the underside of the board I suggest soldering to the existing solder joints of the relevant pins of the GPIO header rather than the TPs.

LTolledo
Posts: 3321
Joined: Sat Mar 17, 2018 7:29 am
Location: Anime Heartland

Re: RPI4 Back Solder Pads

Sat Jan 25, 2020 9:27 pm

On my RPi4B-2G NAS I supplied power via TP1 (5v) and TP7 (Gnd), using AWG20 wire
RPi4B-2Gpowerin.jpg
RPi4B-2Gpowerin.jpg (96.74 KiB) Viewed 242 times
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