LG KP175 - Page 56

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4. TROUBLE SHOOTING
LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
SETTING : Enter the engineering mode, and set vibrator on at vibration of BB test menu
START
Is the voltage at pin2
of Q400 high
?
YE
S
NO
Is the voltage at pin 3
of Q400 low
?
YES
Check the contact
of vibrator
?
YES
Replace vibrator
YES
Vibrator
Working well !
Check the soldering
of R421,D40
0
NO
Check the soldering
Of D400,R420
Reassembly or
Replace vibrato
r
NO
CHECKING FLOW