LG VX5400 Service Manual page 106

Setting: "ON" at the motor test of "test mode"
Is the voltage of LCD's vibrator contact point about 3.5V
LGE Internal Use Only
Checking Flow
Start
Is the voltage of MOTOR_EN about 2.6V
NO
Check soldering of R601, R602, R603
NO
Is Q601, Q602 Working?
NO
Check the state at contact of vibrator
YES
Rplace the vibrator
The vibrator will work properly
Checking Flow
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Change the main board
YES
Re-solder R601, R602, R603
YES
Replace Q601, Q602
YES
Re-contact vibrator
YES
Rplace the FPCB -
YES
Only for training and serving purposes