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3. Digital TV Video Trouble Shooting
Check RF Ca ble
Check T P Clock, Data, Sync
R440, R441, R442
Tuner(T U400) has prob lems
Check P30 0 LVDS Clo ck
#10(TXEC+) , #11(TXEC-) ,
#22(TXOC+) , #23(TXOC-)
Y
N
Check Tu ner 5V Po wer &
Q708 Ouput(5V)
Replace Q7 08
Y
N
Y
IC101 has problem
N
Y
Check L D400 color
Bad Tun er. Replace Tuner
None
Yello w none
Check Demod ulator Input Clock
X400 (25MHz)
Replace X400
N
Y
Check L CD Module
Control board
Refer to Mo dule CAS
Wave form of X400
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