LG OLED48C3 Series Service Manual page 45

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
All settings  General  Programmes

Programme Tuning & settings 
Manual Tuning
A3
When the signal is strong,
use the attenuator
(-10dB, -15dB, -20dB etc.)
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A3