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42LV3700-UD (CHASSIS:LA12B) - LG TV Service Manual (repair manual). Page 63

Read LG 42LV3700-UD (CHASSIS:LA12B) Service Manual online

12. Trouble shooting - No audio (Component)
Check Component Cable
for damage or open conductor.
Check JK1105 & Signal Line
ok
ok
No
Replace Jack
Follow procedure 
‘8. All source audio’
trouble shooting guide.
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