Dead argon one board?

Hi,

A previously working control board of an argon one v2 case is not working anymore:

It is not detected by i2c:
image

The board was previously in always on mode. And it is still working using this behaviour despite the fact that I changed the switch position.

Is there any way to debug the board? (check if some components are fried?) Is there any way to buy just the board and not the whole case?

Note that the pi is ok. it works correctly in another v2 case I had.