LG UBK80 Service Manual page 62

ELECTRICAL TROUBLESHOOTING GUIDE
POWER SUPPLY ON MAIN BOARD
No 1.05VA_STB
Is the VCC
5.1 VA supplied to IC207
pin1?
Is there any voltage
on IC207 pin5?
Check IC207 and replace.
No 3.3VA_STB
Is the VCC
3.3 VA supplied to IC211
pin5?
Is there any voltage
on IC211 pin4?
Check IC211 and replace.
YES
YES
YES
YES
YES
YES
NO
NO
Check PWR_CTL or voltage on IC302 (Micom).
NO
Refer to No 3.3VA_MICOM.
NO
Check PWR_CTL2 or voltage on IC302 (Micom).
3-45
Copyright © 2020 LG Electronics Inc. All rights reserved.
Refer to No 5.1 VA.
Only for training and service purposes.