Hi everybody,
after many weeks of searching a solution, i've solved the problem.
That's what i've done:
- made the UV sticker installed on the proximity sensor (the right one)
black with a permanent marker
- put another UV sticker on the installed one on the proximity sensor. Than made it black with a permanent marker.
- put an UV sticker on the light sensor (left one). Than made it black with a permanent marker.
- put an adhesive foam like [http://i00.i.aliimg.com/wsphoto/v0/1001469016/100pcs-a-lot-font-b-Proximity-b-font-Sensor-font-b-Fix-b-font-Repair-Pad.jpg|this] on both the sensor
Now the proximity sensor works again!
Hope this helps the community