LG 42PT250B Service Manual page 41

3. Digital TV Video Trouble Shooting
Check RF Cable
Y
Check Tuner(TU1300) Power
(5.0V, 3.3V, 1.2V)
Y
Check IF Signal pin #17, 18
Y
Check Demodulator Power
(*Brazil Model only)
(3.3V, 1.2V) L609, IC600
Y
Check Demodulator X-TAL
(X602)
Y
Check TP Clock, Data, Sync
R630, R631, R632 , R633
Y
Maybe MstarS7LR(IC101)
has problems
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Only for training and service purposes
N
Replace one of Bead
& Recheck
N
Maybe Tuner has problems
N
Replace L609 / IC600
N
Replace X-TAL
N
Maybe Demodulator has problems
LGE Internal Use Only