I never really understand what the problem is with undervolting a device, I've heard people worried about brownouts, but... that just means the electronics defaults to the "false / 0" branches in its startup circuity (by my limited understanding)
comments
Yeah indeed that is the next problem. Some docs would be nice but what I need most is the polarity and voltage. From there I can tinker.
Found this on another model:
There is one 2-pin power connector on the top side supporting an input DC voltage range of 24 V DC ±20 %, see Figure 4 (pos. 1). The mating connector required to connect the power connector to a DC main power source is supplied with the BL i.MX6 ULL. For information on how to connect the supplied mating connector to the input power connector, refer to Chapter 6.2.1: Wiring the DC Mating Power Connector. For the pin assignment of the input power connector, refer to Chapter 3.2.1: Power Connector.
Maybe I’ll start at 12 then try 24v.
I’m impressed! Good find. Now I just need to find out the polarity and voltage.
Oh wow spitting image of the that top photo, yeah I think you've got it.
Edit: It says it's a Kontron product, but I cannot find it in their product page
https://www.kontron.com/en/products/boards-standard-form-factors/single-board-computer/3.5/c164338
One of these?
Closest I found model number wise is the Kontron / ECX-SLUO. I'm guessing the board you bought is old and belongs to a much older variant of that series. If you take the heatsink off you should be able to see the CPU model.
It seems like an industrial control device, that green port is probably for power.