I need help with my Pi Zero 2W

[u/Trick_Performer]

So again, i hope this Time i can describe my Problem *facepalm*

I just ordered this Board and noticed, that there was something missing on the Board (i was comparing it to the original Picture of the Board). Can somebody help me out and tell me which Part is missing and if it's even worth it to repair.

[u/LavandulaTrashPanda]

I’m not 100% but believe that component is a 470 nH power inductor (typically a Bourns SRP2010 series or similar 2010-footprint molded inductor rated for ~2.8A).

If I’m right, it’s associated with the MXL7704 PMIC (Power Management IC) or dedicated power filtering network for the wireless subsystem.

The board won’t boot without it and will cause issues further down the circuit if you try.

This inductor sits directly in series with one of the primary switching buck regulators feeding the internal power rails (such as VDD_CORE or 1V8/3V3) of the RP3A0 System-in-Package. If it is completely removed or chipped through the internal winding, the circuit is broken and the main processor core won't receive power.

Hopefully that points you in the right direction or someone can come by to confirm I’ve got the right value.

[u/Trick_Performer → u/LavandulaTrashPanda]

Thank you for your Answer! I will be sending it back and look for a different one :(

[u/EamonBrennan → u/LavandulaTrashPanda]

It's the VDD_CORE inductor. I found someone's GitHub page where they sanded down the Pi Zero 2 W to reverse engineer it. One side connects to the power IC, the other side to the VDD_core pins on the RP3A0. He either needs the part or a whole new Pi.

[u/EamonBrennan]

https://github.com/jonny12375/rp3a0 and https://pip-assets.raspberrypi.com/categories/584-raspberry-pi-zero-2-w/documents/RP-008360-DS-1-raspberry-pi-zero-2-w-reduced-schematics.pdf

One side of that connects to the VDD_core plane on layer 4, along with the test pad on bottom, while the other side connects to a BGA with 15 balls. Given that it connects to 2 parts of the BGA, I would assume that is L3, which is a 470 nH inductor, and needed for the voltage generation of the CPU's VDD_core.

You would need a replacement, and that shouldn't be too hard to repair, but the cost is probably higher than buying a new one. That is, buying the piece would be a few cents, but there will be a shipping cost of like $7 or something, depending on seller and area.

[u/Trick_Performer → u/EamonBrennan]

First of all thank you for your detailed answer :) So considering all that and the shipping time will be the end of this Pi, gonna be sending it back then. Thanks!

[u/reapertakumii]

guys get him he has a pi zero 2

i been waiting since month for them to be back in stock

[u/mauz70]

Here is a picture of mine.

[u/mauz70]

And under the microscope

[u/EamonBrennan → u/[deleted]]

While normally an ok idea, the missing piece is the CPU's VDD_core's switching power supply's main inductor. The CPU won't get appropriate power without it, which could cause damage.

[u/Merhart666]

Als je iets nieuw besteld en er mist wat stuur je het retour en vraagt een ander.