MacBook 12" 2015 Internal SSD not showing up in Disk Manager

Hello, i have a Problem with my MacBook 12" from early 2015 where it just acts like it has no SSD installed. One day I was just waking my MacBook up from sleep, when suddenly the screen went Black. Then it restarted and showed the Icon, that means that no OS is installed (Folder Icon with Question Mark). I tried going into Disk Manager via Internet Recovery, but the SSD wasn't showing up there (See Pictures Below). I also tried booting into MacOS High Sierra and Big Sur over an external SSD, but the SSD wasn't showing up there either.

I have some repair skills, but I obviously can't swap out the SSD because it's soldered onto the LogicBord. I don't have the Machines for that. Can I still save my Mac or do I need to replace the LogicBord?

Pictures: