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55LE5400 (CHASSIS:LA02D) - LG TV Service Manual (repair manual). Page 76

Read LG 55LE5400 (CHASSIS:LA02D) Service Manual online

Check Cable conductors
for damage or open conductor
Check JK8401 & Signal path
ok
No
ok
Replace Jack or components
Follow procedure 
‘8. All source audio’
trouble shooting guide.
16. Trouble shooting - No audio (RGB-PC)
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