Problem - White or Black spots or Black shadow appearing on the Screen .
-If you notice these spot on your screen, it may be due to fine dust particles on the screen's surface or the LCD panel.
- You
can clean the screen using a soft, dry Cotton Swab make sure not to apply too
much pressure, which could damage the screen. Please Refer Below Mention video to clean dust
particles - LINK
Recommendations - Please do clean the filters , Cleaning dust
filters is an important maintenance task for projectors, as it helps to ensure
that the projector functions properly and produces clear, bright images.
Steps you can follow to clean the dust filters:
Locate the dust filter on your projector. It's usually located on the side or back of the projector and can be accessed by removing a cover or panel. Carefully remove the dust filter from the projector.