LG LG-E960 - Light Sensor On;Off Trouble

4. TROUBLE SHOOTING
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4.18 Light Sensor on/o trouble
Light Sensor is worked as below:
Menu Key click -> Settings click -> Display click -> Brightness click -> Automatic brightness click
VREG_L9_3V(TP1)
Yes
Yes
Yes
START
LCD brightness change?
Change the main board
Function is OK?
Change the Upper FPCB.
No
No
Menu key click
->Settings click
-> Display click
-> Brightness click
-> Automatic brightness click
Hide Illumination sensor by hand
Output work well?
END
END
END
No