47LY3DE-AA (CHASSIS:LB75B) - LG TV Service Manual (repair manual). Page 41

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Check HDMI Cable
Check MST3361 (IC402)  output
HDMI_SPDIF (R409)
Check CS8416 (IC501)  inputs
HDMI_SPDIF (C5005)
Check CS8416 (IC501)  outputs
DATA(#26), SCLK(#27), LRCLK(#28)
Check X260 (IC101) Inputs
SCLK(R175), LRCLK(R176), DATA(R177)
Follow the procedure of
"COMMON SOUND OUT"
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