LG 60LB5900 Service Manual page 21

7. Digital / Analog TV Audio
Check RF Cable & Signal
ok
Check Tuner 3.3V Power
L1600
ok
Check IF_P/N Signal
TU1601 6/7 Pin
ok
Follow procedure
'6. All source audio'
trouble shooting guide.
8. AV/Comp Audio
Check AV Cable f or damage
f or 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 L1600
No
Bad Tuner. Replace Tuner.
No
Replace Jack
- 21 - LGE Internal Use Only