Nothing but red light.

[tkaiser]

The board is getting 5.22v, measured off the Pi2 GPIO connector.

Sounds good. The question is how low voltage drops under load. Someone reported measuring up to 800mA consumption while booting a Linux image.


Since I do many tests with SBCs I kept a well known 'crap cable' here instead of throwing it away (USB type A to Micro USB). With this cable I already get 0.6V less at 600mA consumption. And while the A64's PMU might be able to use very low input voltages I still doubt that this applies to DC-IN and normal operation.

Anyway: In case you can try powering through the Euler connector and/or measure voltages when the board starts up (BTW: I always use a powermeter when I try out new stuff on boards when no serial console is available. Consumption while trying to boot tells pretty much)