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60LS5700, 60LS5750, 60LS579C (CHASSIS:LA22E) - LG TV Service Manual (repair manual). Page 22

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3. Analog TV Video
Check RF Cable & Signal
Check Tuner 3.3V Power
L6503
Replace L6503
Check Tuner 1.8V Power 
IC6503 2 pin : 1.8V
Check CVBS Signal
TU3700 8 Pin
Replace IC6503 .
Check Mstar LVDS Output
ok
ok
ok
ok
No
No
No
No
Bad Tuner. Replace Tuner.
Replace LGE2112(IC105) or Main Board.
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