LG 32LG710H Service Manual page 55

SPDIF Audio out Trouble shooting guide
Check the output (Pin AF5) of BCM3549(IC100).
Measure waveform at R680 because it's more easy to check.
Can you see the normal signal?
YES
Check the input of JK300.
Can you see the normal waveform?
YES
After checking the Jack, you should decide to replace item or not.
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Only for training and service purposes
NO
This board has big problem because Main chip(BCM3549) have some troubles.
After checking thoroughly all path once again, You should decide to replace BCM3549 or not.
NO
After checking audio signal line, you should decide to replace item or not.
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