Raspberry Pi 3 test pads

[Chedda]

So far that I have put together this pinout just by reading all the schematics and traces.


PP1 VCC +5V
PP2 VCC +5V
PP3 DND
PP4 GND
PP5 GND
PP6 GND
PP7
PP8
PP9
PP10 Power LED
PP11
PP12
PP13 Status ACT LED
PP20
PP21 RUN
PP22 Ethernet Activity LED
PP23 Ethernet Link
PP24 Composit Video
PP25 L Audio
PP26 R Audio
PP27 USB VCC
PP28
PP35 VCC +5V
PP36 USB D-
PP39
PP40
PP41 USB D+
PP42 USB D-
PP43 USB D+
PP44 USB D-
PP45 USB D+
PP46 USB D-
PP47 USB D+
PP48 GND
PP49 GND
PP50 GND
PP51 GND
PP52 Ethernet TX+ ?
PP53 Ethernet 3v3 ?
PP54 Ethernet RX+ ?
PP55 Ethernet TX- ?
PP56 Ethernet RX- ?
PP57 Ethernet 3v3 ?
PP58
PP59
PP60


I now have a Pi3 and I have validated what I can test out. The ethernet looks like it has a filter and is blocking my tests.

[Ziggurat]

There does not seam to be pogo pin test pads for the SD card slot

[Chedda]

That's correct. It is a no go. I have to desolder the micro SD slot and put in a ribbon cable setup.

[Ziggurat]

I think it would be easier to retain a proper connection without interference using one of these.

https://www.aliexpress.com/item/TF-Micr ... 432656df96

I ordered one

[Chedda]

I didn't even know that this was a thing! I just ordered one. lol

[Purple_Moogle_00]

bump

[Chedda]

Power in are vcc +5V and then the power out is ground. If you are powering other items, use the gpio

[Purple_Moogle_00]

Don't really know what the symbols mean. What test pads are for power input

[Chedda]

Don't really know what the symbols mean. What test pads are for power input

PP1 and PP2 are your 5V in.

[mdella]

So I'm looking at PP35 and PP7 for my +5v internal line. I noticed that PP35 is after the polyfuse (changed from the previous 5v 1.1A fuse to a 16v 2.5A fuse) and before something that seems to act like a diode but I'm not entire sure of its purpose... prior to TP7 which is the "usable" internal 5V line.

My question is what is the new circuit intended to do that sits between PP35 and PP7?

I'm currently using an external regulated power supply on GPIO pin 2 (with a 5v 1.1A polyfuse prior to it). This has suited my cluster for all the Pi 2+ boards. But I'm starting to upgrade my cluster to Pi 3's and wanted to know (besides the fuse size change with is irrelevant in a cluster case) if there was something else that had to be added to the daughter cards that passed power up and down the stack.

Marcos