Service manual

H57
3-4
Coretronic Corporation
3-2.3 Performance Troubleshooting (Computer Signal)
A. Have Image?
- Ensure if the signal cable and source work as well.
- Check if OSD Menu shows on the screen.
- Check Main Board.
- Check DMD Board.
B. Have Garbage Pattern?
- Ensure the Signal cable and Source work as well.
- Check the Main board.
- Check the DMD board.
C. Uniformity OK?
- Ensure the Projection screen without dirty.
- Ensure the Projection lens is clean.
- Ensure the Uniformity is within spec.
- Check the Optical engine.
D. Is Color OK?
- Ensure if signal cable works as well.
- Check the “Color wheel index” in the engineering mode of OSD Menu. (*Note)
- Check Photo Sensor.
- Check Main Board.
- Check DMD Board.
E. Dot Defect isn’t Compliant with the Spec.
- Ensure the projection lens is clean.
- Use the air gun to clean the optical engine.
- Check DMD chip.
F. Have Noise?
- Ensure if the signal cable and source work as well.
- Adjust the tracking selection on OSD Menu.
- Press the Menu button to check that have the noise issue appear on OSD Menu.
(Check DMD Board if the noise also appears on OSD Menu.)