LG 55LA86 Series Service Manual page 113

Standard Repair Process Detail Technical Manual
Error
Established
A. Video error_Video error, video lag/stop
2012. 12 .06
symptom
date
LCD TV
Revised
TUNER checking part
Content A9
date
<ALL MODELS>
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.