Is there anyone local who can repair Naomi 2 motherboards? Mine only shows a black screen on boot and I’m keen to get it fixed.
The only person I'd say would have the knowledge to correctly diagnose and not blindly poke around would be Ken from irepairsega.
Whether he'd take on the repair, and whether it's worth the risk shipping over is something you/him would have to discuss.
Black Screen/No Boot is like 8-10 different causes from memory, ranging from simple (replace super cap) to unfixable (Popped BGAs), working out the exact cause for each board is where the knowledge is needed.
If it's a new purchase send it back, as it's not worth the headache! If it's something you already had but now stopped working, then possibly worth trying to get fixed given how hard it is to find Naomi 2 over here lately.
I personally sent Ken a bunch of Naomi 2 earlier in the year, most of which had the same issue as yours, and he managed to fix them all.
Collectively, listed issues were fans, super caps, stack connectors, corrosion (in multiple different locations on the boards), open traces, BGAs. (Every board needed multiple of these issues fixed)
I got very luck in that not only did they survive the trip over and back with no popped BGAs, but he was also able to fix them all.
Good luck, hopefully you get a positive outcome!
Edit - I forgot that I did also buy 2 x Naomi 2 in the USA and had the sellers ship to Ken and both were not fixable, so it's a reminder that these boards aren't always able to be saved.