LG KF600w Service Manual page 118

Setting: "ON" at the motor test of "test mode"
Checking the Motor LDO Voltage 3.1V?
Checking PWM SIGNAL(Q401)?
Checking The Motor connector ?
The vibrator will Work properly
Motor +
Motor -
Checking Flow
Checking Flow
Start
YES
YES
YES
Replace Vibrator
YES
Change the LDO U412
NO
Change the MSM
NO
Change the AMP(U413)
NO