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42LK452 (CHASSIS:LB01M) - LG TV Service Manual (repair manual). Page 21

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- 21 -
11. AV Audio
Check AV Cable for damage
for damage or open conductor.
Check JK1604 & Signal Line.
ok
ok
No
Replace Jack.
Follow procedure 
’8. All source audio’
trouble shooting guide.
12. Component Audio
Check Component Cable
for damage or open conductor.
Check JK1601, JK1603 
& Signal Line.
ok
ok
No
Replace Jack.
Follow procedure 
’8. All source audio’
trouble shooting guide.
13. RGB Audio
Check Cable conductors
for damage or open conductor.
Check JK1102 & Signal Line.
ok
No
ok
Replace Jack.
Follow procedure 
’8. All source audio’
trouble shooting guide.
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