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50PT490-UC, 50PT490U-UA (CHASSIS:PU11L) - LG TV Service Manual (repair manual). Page 62

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10. Digital TV Audio Trouble Shooting
Check video output
Y
Follow procedure All source audio 
trouble shooting
Maybe Mster S7R internal audio 
DSP has problems. 
Replace It
N
Follow procedure digital TV video 
trouble shooting
N
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