LG UBK80 Service Manual page 65

ELECTRICAL TROUBLESHOOTING GUIDE
POWER SUPPLY ON MAIN BOARD
No 3.3V_NOR
Is the VCC
3.3 VA supplied to IC209
pin5?
Is there any voltage
on IC209 pin4?
Check IC209 and replace.
No 5V_MOTOR
Is the VCC
5.1 VA supplied to IC212
pin5?
Is there any voltage
on IC212 pin4?
Check IC212 and replace.
YES
YES
YES
YES
YES
YES
NO
Refer to No 3.3VA_MICOM.
NO
Check PWR_CTL5 or voltage on IC302 (Micom).
NO
NO
Check PWR_CTL5 or voltage on IC302 (Micom).
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Refer to No. 5.1 VA.
Only for training and service purposes.