LG Flatron L1753 - Raster Troubleshooting

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6. Raster
NO Raster
(Lamp Off)
NO
Check Scaler Output
(Main Board)
CHECK T301, T302
NO
NO
Check Q301, Q302
Check the waveform of U301
Pin1,15
Check the waveform of U301
Pin2, 3
NO
If waveform is no problem
Check D302~D308
Or Trouble in U303, U304
YES
CHECK
P201 Pin9
3.3V?
Check U301 Pin2
5V?
Check U301 Pin6 VSEN,
Less than 1.8V
Check U301 Pin12 SSTVMT
CMP,Less than 2.75V
Check U303, U304
Drain waveform
YES
YES
YES
NO