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50PT490B-SA, 50PT490B-SD (CHASSIS:PB11K) - LG TV Service Manual (repair manual). Page 62

Read LG 50PT490B-SA / 50PT490B-SD (CHASSIS:PB11K) Service Manual online

10. Digital TV Audio Trouble Shooting
Check video output
Y
Follow procedure All source audio 
trouble shooting
Maybe Mster S7 internal audio DSP 
has problems. Replace It
N
Follow procedure digital TV video 
trouble shooting
N
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