LG RD-JT30 Service Manual page 143

2.Color Wheel Delay Alignment
Equipment:
- Battery Biased Silicon PIN Detector
- Oscilloscope
- Probe
Procedure:
1. Probe impedance matches 50 ohm
2. Open Factory OSD, and select color wheel delay item
3. Leave the image pure red (DMD red curtain)
4. Put the detector on the screen that red image was projected.
5. Watch the oscilloscope and notice the square waveform
6. Use the " " and " " key to increment or decrement the color wheel delay value
7. No matter the waveform is square or not, let the waveform was lagged first
Lag
8. Then increment or decrement the value to let the waveform to be square
9. Do not adjust too much, let the signal get ahead, if it happens, go back to step 7 and do it
again.
10. Change the input to pure blue and repeat the above procedures again.
Exact Ahead
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