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42LN54XX, 42LN540S, 42LN540V, 42LN541V, 42LN542V (CHASSIS:LD31B, LD36B) - LG TV Service Manual (repair manual). Page 56

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Standard Repair Process Detail Technical Manual 
Check Back Light On with naked eye 
A. Video error_No video/Normal audio 
 
<ALL MODELS> 
 A1 
Established  
date  
Revised  
date  
Error 
symptom 
Content 
LCD  TV 
Power On -> disjoint back case -> check lighting at 2 points.  
2013. 01 .09 
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