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22LS3500, 22LS3700 (CHASSIS:LB21A) - LG TV Service Manual (repair manual). Page 21

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