LG P705 - Compass Sensor On;Off Trouble Shooting

4. TROUBLE SHOOTING
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4.17 Compass Sensor on/o Trouble Shooting
Compass Sensor is worked as below :
Compass Sensor function On
Measurement
VREG_MSME_1.8V
SENSOR_I2C_SCL / SDA
COMPASS_DRDY
Chang the position of the phone
The direction is correct?
No
No
Yes
Work well?
START
END
No
Yes
Compass Sensor function On
Yes
Check Motion_I2C_SDA/SCL
output(TP2,TP3)
Check COMPASS_DRDY
output(TP1)
Change the Motion Sensor U800
Change the Motion Sensor U800
Change the Main board
No
Yes