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 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.

SD Card voltage switch in original Raspberry Pi 4 board


https://www.cnx-software.com/2020/02/24/raspberry-pi-4-rev-1-2-fixes-usb-c-power-issues-improves-sd-card-resilience/