LG L1933TR-SF - - 19" LCD Monitor Service Manual page 23

Check U301 Pin3
Check U301 Pin2 OVP,
Less than 1.8V
Check U301 Pin10 CMP,
Less than 2.75V
Check U303, U304
Drain waveform
CHECK T301, T302
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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
- 23 -
Check Scaler Output
(Main Board)
Check Q301, Q302
Check the waveform of U301
Pin11, 12, 19, 20
Check the waveform of U301
Pin11, 12, 19, 20
Check Q303~Q308
Or Trouble in U303, U304
LGE Internal Use Only