No reception after changing lightning dock twice

I recently changed the lightning dock of my iphone and unfortunatly the headphone jack did not work anymore, so i returned the part and bought another one. After replacing it with that one i have no reception anymore. Even when i built my old lightning dock back in there is still no reception. Wi-Fi still works.

I checked the antenna of the lightning dock part and it is connected to the logic board and the sim card is also inserted.

Did i mess up my logic board or is there another explanation?

Thank You!