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32LS3450, 32LS345Y (CHASSIS:LB21C) - LG TV Service Manual (repair manual). Page 21

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10. AV Audio
Check AV Cable for damage
for damage or open conductor
Check JK1601 & Signal Line
R1632, R1633
ok
ok
No
Replace Jack
Follow procedure 
‘8. All source audio’
trouble shooting guide.
11. Component Audio
Check Component Cable
for damage or open conductor.
Check JK1602 & Signal Line
R1632, R1633
ok
ok
No
Replace Jack
Follow procedure 
‘8. All source audio’
trouble shooting guide.
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