LG 40LF6300-UA Service Manual page 94

Standard Repair Process Detail Technical Manual
Error symptom
Content
<ALL MODELS>
MENU  Channel
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Only for training and service purposes
A. Video error_Video error, video lag/stop
TUNER input signal strength checking method

Manual  select channel
Established
date
Revised
date
When the signal is strong, use the
attenuator (-10dB, -15dB, -20dB etc.)
A6
LGE Internal Use Only