55LEX8-SA (CHASSIS:LJ03S) - LG TV Service Manual (repair manual). Page 81

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Check Cable conductors
for damage or open conductor
Check JK3201(in Sub B/D #2)
& Signal path
ok
No
ok
Replace Jack or components
Follow procedure 
‘8. All source audio’
trouble shooting guide.
15. Trouble shooting - No audio (RGB-PC)
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