LG 50PJ350 Service Manual page 48

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
(3.3V, 1.2V) L609, IC600
Y
Check Demodulator X-TAL
(X602)
Y
Check TP Clock, Data, Sync
R630, R631, R632
Y
Maybe MstarS7(IC100)
has problems
Customer Oriented R&D
N
Replace one of Bead
& Recheck
N
Maybe Tuner has problems
N
Replace L609 / IC600
N
Replace X-TAL
N
Maybe Demodulator has problems
Breakthrough