LG Flatron L1742P Service Manual page 21

Check U301 Pin2
Check U301 Pin6 VSEN,
Less than 3V
Check U301 Pin12 SSTCMT,
Less than 1V
Check U303, U304
Drain waveform
CHECK T301
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Only for training and service purposes
NO Raster
(Lamp Off)
CHECK
P201 Pin9
3.3V?
YES
5V?
YES
YES
YES
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
LGE Internal Use Only