LG 50PG30 Service Manual page 19

Digital TV Video Trouble Shooting
Check Demodulator Input Clock
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Only for training and service purposes
TROUBLE SHOOTING GUIDE
Check RF Cable
Y
Check Tuner 5V Power
IC703 #5 Pin
Y
Check LD400 color
None
Check TP Clock, Data, Sync
R440, R441, R442
Y
X400 (25MHz)
Y
Check Mstar LVDS output
#33(TXAC-) , #32(TXAC+) ,
#17(TXBC-) , #16(TXBC+)
Y
Check PDP Module
Control board
Refer to Module CAS
N
Replace IC703
Yellow --> none
Bad Tuner. Replace Tuner.
N
Maybe Tuner(TU400) has problems
N
N
Maybe Mstar(IC100) has problems
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Replace it
LGE Internal Use Only