xperia z3 blank screen after trying to repair it after it got wet

Hello

so last summer i tryed to take pictures with my z3 under sea water. bad idea.

the phone showed an overheating alert and then shutdown.

after opening it and drying it the phone started again. i could hear everything, the vibrator works, the camera seemed to work everything seemed to work except the screen and degitizer that were blank.

in my attempt to repare it, i changed the screen, then the flex cable then both of them.

needless to say nothing changed still blank screen.

can you guys help me figure this out