Illumination Sensor On/Off Trouble - LG -P990 Service Manual

4.22 Illumination Sensor on/off trouble

Illumination Sensor is worked as below:
Menu Key click Settings click
Automatic brightness click
Hide Illumination sensor by hand
Yes
LCD brightness change?
No
Check LSENSOR_BIAS/SENS
Yes
Yes
Measurement
LSENSOR_BIAS
LSENSOR_SENS
LGE Internal Use Only
Display click
START
No
No
Work well?
END
Brightness click Automatic brightness click
Change the upper FPCB
Change the main board
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4. TROUBLE SHOOTING
Only for training and service purposes