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60LS5700, 60LS5750, 60LS579C (CHASSIS:LA22E) - LG TV Service Manual (repair manual). Page 27

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9. Digital TV Audio
Check RF Cable & Signal
Follow procedure 
‘8. All source audio’
trouble shooting guide.
ok
Check Tuner 3.3V Power
L6503
Replace L6503
Check Tuner 1.8V Power 
IC6503  2 pin : 1.8V
Check IF_P/N Signal
TU6500  10/11 Pin
Replace IC6503 
ok
ok
ok
No
No
No
Bad Tuner. Replace Tuner.
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