LG -A290 Service Manual page 75

SETTING : Enter the engineering mode, and set vibrator on at vibration of BB test menu
START
Check the soldering
of vibrator(VB300) ?
Yes
Is the voltage at TP1
3.3V?
Replace vibrator
Vibrator
Working well !
LGE Internal Use Only
Yes
Yes
No
No
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4. TROUBLE SHOOTING
Resolder the Pad
(VB300).
Replace the U03
Only for training and service purposes