Edit:

I loosed some of the screws. Make sure everything was in the correct place, played some more minutes, wave around the SD and no error. Not sure why happened the first time, but seems that I over tightened a bit the screws.
Thanks for the help, the sarcasm and the other comments.

Hello,
I just replaced the thermal paste with PTM7950, downloaded some games and started playing Subnautica when all of a sudden, seems that all the Steam Deck got freeze.

Did a hard reset, and now the Steam Deck shows a black screen but fan is working.

Did I messed up?