LG OLED77Z19LA Service Manual page 42

Standard Repair Process Detail Technical Manual
symptom
Content
Check a voltage of R30325 when TV is on.
Vx1 is OK if the voltage is 0V(Low).
Error
error_No
A. Video
Check Vx1 Lock
Established
video/Normal audio
A1
date
Revised
date
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A1