LG M2794D - Page 18

Check RF Ca ble
Check T P Clock, Data, Sync
R440, R441, R442
Maybe Tun er(TU400) has problems
Check IC10 1 LVDS output
#8(TXEC+) , #9(TXEC-) ,
#20(TXOC+) , #21(TXOC-)
Y
N
Check Tu ner 5V Po wer &
Q707 5V
Replace Q7 07
Y
N
Y
Replace IC101 has problems
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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Only for training and service purposes
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3. Digital TV Video Trouble Shooting
->
Wave form of X400