47LV355T-ZC (CHASSIS:LD11U) - LG TV Service Manual (repair manual). Page 74

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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
A9
2011. 2 .07
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