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47LA6608, 47LA660S, 47LA660V, 47LA6678, 47LA667S, 47LA667V (CHASSIS:LD33B) - LG TV Service Manual (repair manual). Page 114

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Checking method:  
1. Check the signal strength or check whether the screen is normal when the external device is connected.  
2. After measuring each voltage from power supply, finally replace the MAIN BOARD.  
Standard Repair Process Detail Technical Manual 
TUNER checking part 
A. Video error_Video error, video lag/stop
 
<ALL MODELS> 
 A9 
Established  
date  
Revised  
date  
Error 
symptom 
Content 
LCD  TV 
2012. 12 .06 
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