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50PH470U-ZD (CHASSIS:PD32C) - LG TV Service Manual (repair manual). Page 48

Read LG 50PH470U-ZD (CHASSIS:PD32C) Service Manual online

9. Digital TV Audio Trouble Shooting
Check video output
Y
Follow procedure All source audio 
t
bl
h
ti
Maybe LGE2122(MTK IC) internal 
di DSP h
bl
R
l
It
N
Follow procedure digital TV video 
trouble shooting
N
trouble shooting
audio DSP has problems. Replace It
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