LG P705 - Proximity Sensor On;Off Trouble Shooting

4. TROUBLE SHOOTING
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4.15 Proximity Sensor on/o Trouble Shooting
Proximity Sensor is worked as below :
Call connected -> Object moved at the sensor -> Control the screen’s on/o operation automatically
Measurement
VREG_MSME_1.8V
VREG_P3_2.85V
PROX_OUT
PROX_I2C_SCL / SDA
Call Connect & Object moved at the
Proximity Sensor
LCD o?
No
No
Yes
Work well?
START
END
Change the
Proximity Sensor (U900)
No
Yes
Chang the main board
Yes
Check PROX_I2C_SDA /
SCL Output & Prox_out
(TP1,2,3)