LG Flatron L226WTQ Service Manual page 18

TROUBLE IN DPM
CHECK R718 AND
R719, SYNC
APPEARED?
CHECK
1
U501 PIN 32,33
2
SYNC PULSE
TROUBLE IN U501
Waveforms
1 H-SYNC
4. TROUBLE IN DPM
YES
YES
2 V-SYNC
NO
NO
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CHECK PC
PC IS GOING
INTO DPM MODE
CHECK H/V SYNC LINE