LG MG210 Service Manual page 61

4. TROUBLE SHOOTING
START
Signal of pin3 of Q301
is OK?
Yes
Pin1 of Q301 is 3.1V~4.2V?
Yes
Check the soldering of
R306
Yes
Cable of vibrator is OK?
Yes
Vibrator is out of order.
Change the Vibrator.
Enter into Engineering Mode
and select Vibrator
No
Voltage of R307
is 2.8V
No
Check the soldering of
R304, R305
Yes
No
Resolder R306
No
Not connection
Change the Vibrator.
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No U200 is out of order.
Change the U200.
Yes
Q301 is out of order.
Change the Q301.
No
Resolder
R304,R305
Change the Q301