Power suddenly turns off after screen is plugged to the logic board

So three days ago, I fell down to a swimming pool when I was holding my phone. After some while I found out that my phone is still working, the battery, the system, speakers, etc. under one condition: if the screen isn’t connected to the logic board. When I connect my screen to the logic board, the phone suddenly died as if I turned it off. Thanks in advance for the answer guys, I really need your help.