PSU voltage pinouts for Helios4
I've been using a Helios4 for nearly 2 years now and it's been fantastic. A couple days ago, it stopped working though. The serial console revealed a boot loop at "U-Boot SPL" and only showing the disks, but never attempting to boot the OS. I did some forum searching and discovered the PSU could be the issue. Using a multimeter, I tested the PSU pins and I get the following (see diagram):
PIN 1: +2.66V (fluctuates between 2.64-2.66)
PIN 2: +2.66V (fluctuates between 2.64-2.66)
PI
You are correct, the Helios4 PSU is outputting DC 12V / 8A.
PIN 1: 12 VDC
PIN 2: 12 VDC
PIN 3: GND
PIN 4: GND
And yes between the 4-pin connector and the AC/DC power adapter it's just 2 wire ( +12VDC (red) and GND (black) ). So it should be easy to replace the power block with another while keeping the 4-pin connector as you did ;-)