Hello,

Now I made the pictures of my phone. I think I discovered the problem, which I didn't saw the first time, now. You can see it on picture F and G. There the sticker is red :(

Sorry for the bad quality, but my K800i was unable to focus the object correctly:

K850_A
K850_B
K850_C
K850_D
K850_E
K850_F
K850_G
K850_H


So I think it's a water damage.
Is there a chance to repair it, if the water doesn't damaged something?