LG OLED77B3 Series - B. Power error (Off when on, off while viewing, power auto on;off)

Off when on, off while viewing, power auto on/off
Error?
N
Y
Check Power Off
Mode
Fix A/C cord & Outlet
and check each 2
phase out
Check A/C cord
Check for all 2- phase
power out
Check outlet
Replace Main B/D
CPU
Abnormal
(If Power Off mode
is not displayed)
Check Power B/D
voltage
Y
N
Replace Main B/D
Normal
voltage?
Replace Power B/D
Replace Power B/D
N
Y
Normal? End
※ Caution
Check and fix exterior
of Power B/D Part
☞A10
☞A9
Established
date
Revised date
7/16
Error
symptom
Standard Repair Process
7
Abnormal
1
B. Power error
Copyright © 2023 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.