LG 75SJ857A Service Manual page 41

Standard Repair Process Detail Technical Manual
symptom
Content
<ALL MODELS>
Error
A. Video error_Video error, video lag/stop
TUNER input signal strength checking method
Established
date
Revised
date
Advanced Channels
Manual Tuning
A3

Channel Tuning
When the signal is strong,
use the attenuator (-10dB, -
15dB, -20dB etc.)
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A3