LG OLED77C9PTA Service Manual page 46

Standard Repair Process Detail Technical Manual
symptom
Content
Error
A. Video error_Video error, video lag/stop
Tuner input signal strength checking method
Established
date
Revised
date
1. Press 'MENU' button on Factory Service remote control.
2. Enter into Manual Tuning menu as below.
All Settings  Programmes  Programme Tuning & Settings
 Manual Tuning
3. Check the signal level.
A3
When the signal is strong,
use the attenuator
(-10dB, -15dB, -20dB etc.)
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A3