32LG710H (CHASSIS:LA95A) - LG TV Service Manual (repair manual). Page 52

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AV/Component/RGB-PC Audio(in) Trouble shooting guide  
Check JK1701, JK1702, JK1703, JK704.
Can you see the normal waveform?
NO
JK1701, JK1702, JK1703, JK704. may have problem. Replace this Jack.
YES
Check the input (Pin AC8,AB9,AF6,AE7,AF7,AE9,AB10,AD10) 
of BCM3549((IC100).Measure waveform at 
C1004,C1005,C1006,C1007,C1008,C1009,C1010,C1011
because it’s more easy to check. Can you see the normal waveform?
NO
After checking audio signal line, you should decide to replace item or not.
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