Switch Blackscreen, only some payloads work

Nintendo Questions Nintendo Switch
1

Hey,
I have a switch here wich i get only into RCM with unplugged eMMC. Only some payloads work, hekate 5.5.8 for example only with no SD Card. Biskeydump works, too. Memload stops with error.
What ells can i test or look for.

Tanks