LG OLED55B7P Service Manual page 39

Standard Repair Process Detail Technical Manual
Error
Established
error_No
A. Video video/Normal audio
symptom
date
Revised
Content Check Vx1 lock A1
date
R7624 : 0[V]
Check a voltage of R7624 after turn on the TV.
If the voltage is low, Vx1 is locked.(OK)
A1