Proximity Sensor On/Off Trouble - LG E900 Service Manual

4.19 Proximity Sensor on/off trouble

Proximity Sensor is worked as below :
Send Key click Phone number click
Control the screen's on/off operation automatically
Send Key click & call connected
Object moved at the Proximity Sensor
YES
Yes
Check POWER & SIGNAL
Chasnge the KEY_FPCB
Change the Main Board
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Only for training and service purposes
Call connected
Start
LCD off?
No
( TP1 ~ TP4 )
No
Work well?
No
End
Object moved at the sensor
Yes
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4. TROUBLE SHOOTING
LGE Internal Use Only