LG Flatron L1753 Service Manual page 21

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