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50LN5400-SA, 50LN5400-SB (CHASSIS:LJ36B) - LG TV Service Manual (repair manual). Page 60

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Standard Repair Process Detail Technical Manual 
Power Board voltage measuring method 
A. Video error_No video/ Audio
 
 A4 
Established  
date  
Revised  
date  
Error 
symptom 
Content 
LCD  TV 
Check the DC 24V, 12V, 3.5V. 
2012. 11 .17 
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