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50PM4700-ZA (CHASSIS:PD22B) - LG TV Service Manual (repair manual). Page 56

Read LG 50PM4700-ZA (CHASSIS:PD22B) Service Manual online

Check video output
Y
Follow procedure All source audio 
trouble shooting
Maybe MTK5369(IC100) internal 
audio DSP has problems. Replace It
N
Follow procedure digital TV video 
trouble shooting
N
10. Digital TV Audio Trouble Shooting
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