Cant register network/no signal, after 'water damage'

Just recently dropped my s6 edge into a river, worked for awhile then switched off. Pulled apart my phone, alcohol cleaned it and replaced my battery, now all is working except my phone signal. My sim card works in another phone so i'm questioning what part do i have to make certain is ok apart from the antenna cable and how i can go abouts testing it out. I will reseat the antenna cable although i would like to know what other antenna associated parts i have to play with. I know its not software since i already checked that. Thanks!