Proximity sensor not working

[FlugRost]

Hey,

I droped my iPhone in a water bucket, two weeks ago.
After that i cleaned the hole logicboard with isopropanol and replaced the display with a new one.

The iPhone is now working, only the proximity sensor not.

I used a working screen with sensor from an other phone but this was also not working.
The connector port on the logicboard seems ok.

Do you have any idea?

PS: Sorry for my bad english

 

[Just_Me_D]

Other than to recommend seeking assistance via a nearby Apple Store or contacting the people from iFixit.com, I don't have a clue.