LG M237WD Service Manual page 17

Check RF Ca ble
Check Tu ner 5V Po wer &
Q707 5V
Check L D400 color
None
Check T P Clock, Data, Sync
R440, R441, R442
Check Demod ulator Input Clock
X400 (25MHz)
Check IC10 1 LVDS output
#8(TXEC+) , #9(TXEC-) ,
#20(TXOC+) , #21(TXOC-)
Check L CD Module
Control board
Refer to Mo dule CAS
Copyright 2009 LG Electronics. Inc. All right reserved.
C
Only for training and service purposes
3. Digital TV Video Trouble Shooting
Y
Y
Y
Y
Y
N
Yello w -> -> none
N
Maybe Tun er(TU400) has problems
N
N
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Replace Q7 07
Bad Tun er. Replace Tuner.
Replace X400
Replace IC101 has problems
Wave form of X400
LGE Internal Use Only