LG LG-P350 - Motion Sensor On;Off Trouble

4. TROUBLE SHOOTING
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4.15 Motion Sensor on/off trouble
Motion Sensor is worked as below :
Accelerometer Sensor function On Î Tilt the phone (90˚) Î The screen is had rotated automatically.
Measurement
VREG_MOTION_3.0V(TP1)
MOTION_INT(TP2)
MOTION_I2C_SDA(TP3)
MOTION_I2C_ SCL(TP4)
Tilt the phone
The screen is ratated
No
TP1 check
No
Yes
TP3, TP4 check
START
END
Change the PMIC
No
Yes
Accelerometer Sensor function On
Change the Motion senser U603
Yes
TP2 check
No
Change the Main Board
Yes
Work well?
No
Change the Main Board
Yes