Thank you so very much for replying!
The information checks out for U7: the datasheet indicates a Z38 marking for the SC-88A packaging, and that’s indeed what I see. I’ll try to procure one piece of it to replace it on my board.
However, U8 has a different marking (looks like VN followed by an equal sign with a third dash on top, i.e. something like ||| rotated 90º). The datasheet does not list this as a possible marking. Can you confirm?
Still, I was expecting this to be e.g. a voltage regulator or SMPS IC. I tested the 3.3V rail and it’s at 0.1 V. Point being that I’m not sure U7 could be sole issue here – only way I could think it is would be if its output controls the enable pin of a voltage regulator downstream.
Thus, I’d like to ask whether there is a plan to release these schematics soon, seeing as fixing a board without a schematic is very difficult. Failing that, would you be able to supply the schematics to me alone, prior to the general public release? I’ll sign an NDA, whatever you need. I just want my board back, I had just received it yesterday ):