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50LA66XX, 50LA6608, 50LA660S (CHASSIS:LD33B) - LG TV Service Manual (repair manual). Page 111

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MENU  support   signal test 
  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 
Content 
LCD  TV 
2012. 12 .06 
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