LG 49LF620V Service Manual page 44

Standard Repair Process Detail Technical Manual
Error symptom
Content
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Only for training and service purposes
A. Video error_Video error, video lag/stop
TUNER input signal strength checking method
Established
date
Revised
date
MENU  Press red key Remote controller  signal test
 Select channel
When the signal is strong, use the
attenuator (-10dB, -15dB, -20dB etc.)
A5
LGE Internal Use Only