Hi to all,
in my OU i get this notebook with inverted backlight on screen.
When screen is in normal position (angle over 90°) , no backlight , but i can see a bit desktop 
When screen is near to close (angle 15-20°), backlight works and i can see correctly.
Same issue with/without external monitor .
It seems be lcd closure sensor.....but inverted .
Any hints on how to proceed to fix ? 
Thanks in advance
Bye
Alberto