1. The projector is out of focus. Manually rotate the lens of the projector to focus the projection. Tip: Press the projector menu key to open the projector menu first, and then turn the lens to focus the debugging picture to the best, until you can see the subtitles on the menu clearly.

2. The distance between the projector and the screen or the white wall is not within the projection range of the projector.

3. There is too much dust on the projector lens or dust filter. Clean the lens and dust filter after blowing the lens clean with a soot blower.

4. The light bulb projector has been used for a long time, and the whole picture is gray and fuzzy.