LG 49UB8500-UA Service Manual page 19

# AC3 HDMI2 (C/S: E7 7B)
# AC3 HDMI3 (C/S: A1 8A)
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Only for training and service purposes
# AC3 HDMI4 (C/S: E7 5B)
# PCM HDMI1 (C/S: F7 FD)
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