42LH5700 - LG TV Service Manual (repair manual). Page 36

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Standard Repair Process Detail Technical Manual 
 
1. Video error 
 
(1)  No video/Normal audio 
☞  A1 : Check LCD backlight with naked eye      ☞  A2 : Inverter    B+ 24V measuring method 
                     
 
☞  A3 : Check inverter PCB supply voltage          ☞  A4 : Check White Balance value 
           
 
☞  A5 : Power Board voltage measuring method   
 
 
(2)  No video/Video lag/Stop 
☞  A6 : TUNER input signal strength checking method      ☞  A7 : LCD-TV Version checking method   
                               
 
 
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