Default Xperia Z1 screen problem (white fade)

Today i was swimming with my XZ1, everything was fine, but in the evening my screen was flickering.. now there's white fade all over the screen!! It's something like a negative effect (like on camera)

I have my warranty, the water indicator is still white, so i don't think there's water inside.. I tried flashing 4.3 and 4.4 firmware with flashtool (clean install) and nothing, still the same..

On boot animation too

Any thougts??

Thanks in advance