LG 50UH5500 Service Manual page 105

Standard Repair Process Detail Technical Manual
Error
Established
A. Video error_Video error, video lag/stop
symptom
date
Revised
TUNER checking part
Content A5
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.
3. If you can`t see the UHD live TV, please connect signal at left side of jack. (Korea model only)
A5