LG 55G2 Service Manual page 78

12. Trouble shooting - No audio (SPDIF)
Check SPDIF Cable
ok
Check JK3602 VCC PIN
SPDIF_OUT Signal(3.3V)
ok
Replace JK3602
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Only for training and service purposes
No
Check R630 , C630 , C3615
Replace LG1152D(IC100)
SPDIF
LGE Internal Use Only