LG OLED55B7P Service Manual page 52

Standard Repair Process Detail Technical Manual
Error
Established
B. Power error _No power
symptom
date
Revised
Content Check power input voltage and ST-BY 3.5V A9
date
Check the DC 12VM line for ST-BY Voltage
Power To Main B'd
(ST-BY : 7.8V, Normal : 12V)
P202
Power To Module
P201
A9