Touch is not working with lines on display

Recently my mi5 went in water. After drying it and switching it on, the touch is not working and display is having colored lines. I initially thought that the board is having issue. My friend was having a physically damaged mi5 with the board intact. I replaced that board on my phone but I got the same issue on that board as well. So it's not with Motherboard.

What else might have gone wrong? How to fix it?