42LT360C-TA (CHASSIS:LB2AC) - LG TV Service Manual (repair manual). Page 18

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Check the AV cable is defective
Check the signal of JK1601
R1684, R1685
Yes
Yes
Exchange the AV Jack
No
Implement the “8. Audio of all input” 
Of Malfunction guide
9. AV Audio
10. RGB Audio
Check the Component cable is defective
Check the signal of JK1102
Yes
Yes
Exchange the AV Jack
No
Implement the “8. Audio of all input” 
Of Malfunction guide
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