LG FLATRON L226WTQ-BFQ.A MQF Series Service Manual page 18

TROUBLE IN DPM
CHECK R720 AND
R726, SYNC
APPEARED?
CHECK
1
IC501 PIN89,90
2
SYNC PULSE
TROUBLE IN IC501
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