My iPhone got wet and the screen only dislays black

Here's one of @refectio 's exellent answers:

If you are comfortable opening up the phone, you can try :

Open your phone and remove the logic board (follow this guide)

Inspect the logic board, especially around the connectors and look for corrosion.

Inspect both sides of the board. Unfortunately, 80% of the board is covered in shields. That's usually where the damage is occurring.

Put your board in a container with >90% isopropyl alcohol and let it sit for a while.

Use a soft brush, like a toothbrush and lightly brush away any corrosion you see.

Rinse in alcohol and repeat.

Let it air dry for a day.

Re-assemble and hope for the best.

You should also consider getting a new battery

A professional repair shop that does water damage repair may be able to recover your phone or the data because they have access to pro-level ultrasonic baths and specialized cleaners as well as the skills (and parts) to troubleshoot your board. Many shops have a no fix/no fee policy so you don't have to spend money to find out if the phone is fixable or not.