Read LG 50PH4700-SD / 50PH470H-SA (CHASSIS:PB32A) Service Manual online
16. OPTIC Audio Out Trouble Shooting
Ch k Si
l (JK3606 #3)
Check SPDIF signal (R3662)
Replace MTK Chip
Y
N
Check Signal (JK3606 #3)
Y
Maybe Main Chip(MTK)
has problems. Replace It.
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