LG LG-E960 - Proximity Sensor On;Off Trouble

4. TROUBLE SHOOTING
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4.17 Proximity Sensor on/o trouble
Proximity Sensor is worked as below:
Send Key click -> Phone number click -> Call connected -> Object moved at the sensor -> Control the screen’s on/o
operation automatically
VREG_L9_3V(TP1)
& I2C_SDA(TP2) & I2C_SCL(TP3)
& PROX_AMBIENT_INT _N(TP4)
Yes
Yes
Yes
START
LCD o?
Change the main board
Function is OK?
Change the Upper FPCB.
No
No
Send Key click & Phone number click
& Call connected
Object moved at the Proximity sensor
Output work well?
END
END
END
No