Hi, If it has been wet most likely that screen or board is damaged!
However the screen connection has two leads to the mainboard . On is for LCD and other is for digitizer touch glass. When you open the back cover
The LCD connector is on the far left coonector just above the battery and digitizer has a very small lead fuether up on left connected under metal cover.
You need to lift the metal cover carefully and lift thr connecor latch and the pull the small flat cable. Be carefull this can be damaged if try it hard.
Hope this help