There is always a tendency to turn the phone on to see if it is working, but the battery can discharge through avenues it was not designed to and burn out some components.
- Phone’s should never be turned on once wet, they must be dismantled and dried it a good flow of air
- If the water was salty or dirty then the parts need flapping around in ideally distilled water to remove any salt or particles.
- Once ‘cleaned’ , if you think it necessary, and shaken dry and left in an air flow you can use isopropyl alcohol to draw out some water from accessible areas, like around the contacts
- As you will have voided any warranty you can also dismantle the modules somewhat for better cleaning
- It can take well over 24 hours to dry the innards of the modules
So before you buy any replacement parts you really have to dry it thoroughly.
There are many topics on the details:
Here’s some detail on the case where my daughter dropped it in the toilet, but a) it was for a brief moment and b) she took ages drying it before turning on.
The red square indicates water ingress
You can dismantle the modules, once you see a red square as the warranty is void.
Generally fo dismantling see
and some detail on the top and bottom modules
Cleaning all the contacts once wet and separated is a bit tedious see this about the contacts between the core module shield and the display
It can take a while to get any moisture from between the actual screen, glass etc.
Try and read up in the topics mentioned and search for more to give yourself an idea of what is possible.
If you still can’t get the phone to display see if you have a fairphoneangel near you that may assist.