LG MG120a Service Manual page 53

CHECKING FLOW
SETTING : Enter the engineering mode, and set vibrator on at vibration of BB test menu
START
Is the voltage at pin 1
of Q301 high ?
YES
Is the voltage at pin 2
of Q301 low ?
YES
Is the voltage at pin 2
of Q300 high ?
YES
Check the soldering
of CoN402 ?
YES
Check the soldering
of vibrator ?
YES
Replace vrbrator
YES
Vibrator
Working well !
NO
Check the soldering
of R302, R301
YES
NO
Check the soldering
of R301
YES
NO
Redownload s/w
NO
NO
-53-
4. TROUBLE SHOOTING
NO
Resolder R301, R302
NO
Resolder R301
NO
Resolder u201
Resolder CON402
Resolder vibrator