LG UBK80 Service Manual page 63

ELECTRICAL TROUBLESHOOTING GUIDE
POWER SUPPLY ON MAIN BOARD
No 1.8V_NOR
Is the VCC
5.1 VA supplied to IC203
pin1?
Is there any voltage
on IC203 pin5?
Check IC203 and replace.
No 1.0V_Core
Is the VCC
12 VA supplied to IC205
pin9?
Is there any voltage
on IC205 pin5?
Check IC205 and replace.
YES
YES
YES
YES
YES
YES
NO
NO
Check PWR_CTL3 or voltage on IC302 (Micom).
NO
Check 12 VA on SMPS board.
NO
Check PWR_CTL3 or voltage on IC302 (Micom).
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Refer to No 5.1 VA.
Only for training and service purposes.