LG UBK80 Service Manual page 66

ELECTRICAL TROUBLESHOOTING GUIDE
POWER SUPPLY ON MAIN BOARD
No 5V_USB
Is the VCC
5.1 VA supplied to IC213
pin5?
Is there any voltage
on IC213 pin4?
Check IC213 and replace.
No 8V_LD
Is the VCC
12 VA supplied to IC208
pin2?
Is there any voltage
on IC208 pin1?
Check IC208 and replace.
YES
YES
YES
YES
YES
YES
NO
NO
Check PWR_CTL5 or voltage on IC302 (Micom).
NO
Check 12 VA on SMPS board.
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.