Raspberry Pi 4 Rev 1.2 Fixes USB-C Power Issues, Improves SD Card Resilience

The first Raspberry Pi 4 boards suffered from a poor USB-C power supply compatibility due to issues for the power circuitry. That means if you bought the official USB-C power supply you had no issues, but if you wanted to re-use a spare USB-C power supply or incompatible cable, you may be out of luck.

The Register is now reporting that the Raspberry Pi Foundation has discreetly released a new revision (v1.2) of the board that fixes several issues including USB-C PD compatibility, and as Eben Upton explains the new revision also:

moved the WLCSP SD card voltage switch to the top side

… silk screen tweaks to reduce solder bridging in manufacture”.

The new boards have been around for a couple of months as some users report the USB-C power issues have been fixed on new boards.

Spotting Differences in the new Raspberry Pi 4 Rev 1.2 Board?

The bad news is if you buy the board online, nobody is advertising about the new revision. If you buy in a brick-and-mortar store, there aren’t obvious differences, and the silkscreen markings are apparently the same, but you can check the new location of the WLCSP SD card voltage switch.

Raspberry Pi 4
SD Card voltage switch in original Raspberry Pi 4 board
Raspberry Pi 4 v1.2
SD Card voltage switch in new Raspberry Pi 4 Rev 1.2 board – Source: Imgur

They moved the switch because some people would inadvertently unsolder it in the original version of the board while trying to insert the MicroSD card.

Another way is to check the revision in the command line with cat /proc/cpuinfo

That’s the output from Rev 1.2 board:

If the revision reads “c03112” that means you are the lucky owner of a Raspberry Pi 4 Rev 1.2 board. My board has “Revision : a03111” instead. with the first non-zero a, b, c digit referring to the amount of memory (1GB, 2GB, 4GB RAM). You can learn how to decode Raspberry Pi revision codes here.

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