Digital Tv Video Trouble Shooting - LG M227WDP Service Manual

Check RF Cable
Check Tuner 5V Power &
Q1105 5V
Check LD500 color
None
Check TP Clock, Data, Sync
R521, R532, R533
Check Demodulator Input Clock
X500 (31.875MHz),X501 (20.48MHz)
Check P1103
#13, #14, #25, #26
Check LCD Module
Control board
Refer to Module CAS
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Only for training and service purposes

3. Digital TV Video Trouble Shooting

Y
Y
Y
Y
Y
N
Yellow -> -> none
N
Mabe Tuner(IC500) has problems
N
N
- 24 -
Replace Q1105
Bad Tuner. Replace Tuner.
Replace X500
Replace X501
Place IC100 has problems
Wave form of X500 e
LGE Internal Use Only