Laptop shuts itself off after 2-10 minutes?

The laptop just shuts down without me doing anything. The temperatures are good (cpu and gpu at approx. 40-50c, hard drive at approx. 36)

Have already set up Windows. Installation is not a problem. After that, the problem starts all over again.

Have already tried another hard drive and another Satabank too. I also tested Ram. Each bolt individually and always on a different ram bench.

I have the same laptop here again.

So it's not the power supply either.

Do you have any ideas what I could try?

Or is the mainboard damaged? But would I get this far?

https://praxistipps.chip.de/...ehts_42570

Could it be that your battery is empty? Or broken so that it can't be loaded? Then take a look at your extended energy options to see if the computer is shut down when the battery level is critical.

Take the battery out of the test and only operate it with a power pack.