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42LV5400 (CHASSIS:LA12E) - LG TV Service Manual (repair manual). Page 70

Read LG 42LV5400 (CHASSIS:LA12E) Service Manual online

Check Cable conductors
for damage or open conductor
Check JK804 & Signal path
ok
No
ok
Replace Jack or components
Follow procedure 
‘8. All source audio’
trouble shooting guide.
13. Trouble shooting - No audio (RGB-PC)
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