LG Flatron L1953H - RASTER ISSUES

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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
Pin11, 12, 19, 20
Check the waveform of U301
Pin11, 12, 19, 20
NO
If waveform is no problem
Check Q303~Q308
Or Trouble in U303, U304
YES
CHECK
P201 Pin9
3.3V?
Check U301 Pin3
5V?
Check U301 Pin2 OVP,
Less than 1.8V
Check U301 Pin10 CMP,
Less than 2.75V
Check U303, U304
Drain waveform
YES
YES
YES
NO