LG FLATRONL1753S Service Manual page 21

TROUBLE IN DPM
CHECK
3
R730, R731
CHECK
U201 PIN 27,28
SYNC PULSE ?
TROUBLE IN U201
Waveforms
3
R442 H-Sync
4. TROUBLE IN DPM
YES
YES
3 R443 V-Sync
NO
NO
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CHECK PC
PC IS NOT GOING
INTO DPM OFF MODE
CHECK H/V SYNC LINE