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55LV3730 (CHASSIS:LB12B) - LG TV Service Manual (repair manual). Page 64

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24V is provided from the Power Board and supplied to LED 
Driver PCB. Check the PIN contact condition and connection.
Check each voltage output (5V,12V,24V) in the Power Board.
Established 
date 
Standard Repair Process Detail Technical Manual
Revised 
date 
LCD TV
Error 
symptom
Check LED Driver PCB supply voltage
Content
A. Video error_No video/Normal audio 
A-1-3
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