Proximity Sensor On/Off Trouble Shooting - LG P705 Service Manual

4.15 Proximity Sensor on/off Trouble Shooting

Proximity Sensor is worked as below :
Call connected -> Object moved at the sensor -> Control the screen's on/off operation automatically
Call Connect & Object moved at the
Yes
Measurement
VREG_MSME_1.8V
VREG_P3_2.85V
PROX_OUT
PROX_I2C_SCL / SDA
LGE Internal Use Only
START
Proximity Sensor
LCD off?
No
Check PROX_I2C_SDA /
SCL Output & Prox_out
(TP1,2,3)
Yes
Work well?
Yes
END
No
Change the Proximity Sensor (U900)
No
Chang the main board
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4. TROUBLE SHOOTING
Only for training and service purposes