LG 39LB5600 Service Manual page 21

8. Digital/Analog TV Audio
Check RF Cable & Signal
ok
Check Tuner 3.3V Power
L3703
ok
Check Tuner 1.8V Power
IC3703 2 pin : 1.8V
ok
Check IF_P/N Signal
TU3700 10/11 Pin
ok
Follow procedure
'7. All source audio'
trouble shooting guide.
9. AV Audio
Check AV Cable for damage
for damage or open conductor
ok
Check JK1702 Signal Line
R1714,R1715
ok
Follow procedure
'7. All source audio'
trouble shooting guide.
10. Component Audio
Check Component Cable
for damage or open conductor.
ok
Check JK1702 Signal Line
R1714,R1715
ok
Follow procedure
'7. All source audio'
trouble shooting guide.
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Only for training and service purposes
No
Replace L3703
No
Replace IC3703
No
Bad Tuner. Replace Tuner.
No
Replace Jack
No
Replace Jack
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LGE Internal Use Only