LG GT540 - Motion Sensor On;Off Trouble

4.18 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.
1) Measurement
-. VREG_MSMP_2.6V : 2.6V
-. MOTION_INT : High enable
-. MOTION_I2C_SDA
-. MOTION_I2C_SCL
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4. Trouble Shooting
4.18 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.
1) Measurement
-. VREG_MSMP_2.6V : 2.6V
-. MOTION_INT : High enable
-. MOTION_I2C_SDA
-. MOTION_I2C_SCL
Tilt the phone
The screen is ratated
Yes
No
Check output of the TP1, TP2 & TP3
No
Yes
Work well?
START
Change the Main board
END
Change the Motion Sensor (U600)
Yes
No
Accelerometer Sensor function ON
END