Joy-cons wont connect wireless after replacing fan

I bought a switch(RCM avaible) and installed CFW and have a emunand. Later while playing a game in TV mode(where the joy-cons worked wireless btw) the switch turn off itself cause overheating. Than I realised that my Switch fan doesnt work so I replace it. After that the joy-cons couldnt connect anymore via wireless in sysnand and emunand. The bluetooth from the joy-cons works fine, tested via PC.

I hope you can help me.