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

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3. Digital TV Video Trouble Shooting
Check RF Cable
Y
Check TP Clock, Data, Sync
R1114, R1103, R1102
N
Maybe Tuner(TU1101) has 
problems
Y
Maybe BCM3556(IC100)
has problems
Check Tuner(TU1101) Power
(5.0V, 2.5V, 3.3V, 1.2V)
N
Replace one of 
L1108/L1105/L1100/L1107/L1109
& Recheck
Y
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