LG FLATRON L1550S-SN - DPM Troubleshooting

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4. TROUBLE IN DPM
TROUBLE IN DPM
NO
NO
TROUBLE IN U501
CHECK PC
PC IS NOT GOING
INTO DPM OFF MODE
CHECK H/V SYNC LINE
YES
YES
CHECK
R216, R217
R778, R781
CHECK
U501 PIN 43.44
SYNC PULSE ?
3
3
Waveforms
R216, R778 H-Sync
3
R217, R781 V-Sync