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Copyright©2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
TROUBLE SHOOTING GUIDE
Digital TV Video Trouble Shooting
Check RF Cable
Check TP Clock, Data, Sync
R440, R441, R442
Maybe Tuner(TU400) has problems
Check Mstar LVDS output
#33(TXAC-) , #32(TXAC+) ,
#17(TXBC-) , #16(TXBC+)
Y
N
Check Tuner 5V Power
IC703 #5 Pin
Replace IC703
Y
N
Y
Maybe Mstar(IC100) has problems
N
Y
Check LD400 color
Bad Tuner. Replace Tuner.
None
Yellow --> none
Check Demodulator Input Clock
X400 (25MHz)
Replace it
N
Y
Check PDP Module
Control board
Refer to Module CAS
