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42LH50YD (CHASSIS:LJ91C) - LG TV Service Manual (repair manual). Page 43

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4. Analog TV Video Trouble Shooting
Check RF Cable
Y
Check CVBS Signal
TU1101 #9 Pin
N
Y
Check CVBS Signal
C102
N
Replace one of C1122/R1122
& Recheck
Y
N
Y
Check Tuner Power
(5.0V, 2.5V, 3.3V, 1.2V)
Replace one of 
L1108/L1105/L1100/L1107/L1109 
& Recheck
Maybe Tuner(TU1100) has 
problems
Maybe BCM3556(IC100)
has problems
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