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42LW6500-JA (CHASSIS:LE13E) - LG TV Service Manual (repair manual). Page 70

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MENU Æ signal test
Æ
select channel 
When the signal is strong, use the 
attenuator (-10dB, -15dB, -20dB etc.)
Standard Repair Process Detail Technical Manual
TUNER input signal strength checking method
A. Video error_Video error, video lag/stop 
<ALL MODELS>
A6
Established 
date 
Revised 
date 
Error 
symptom
LCD  TV
A6
2010. 12 .14
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