1. Move the projection image to check if the black/white spot moves with the image, and make sure the wall and screen are clean;
2. Gently wipe the lens clean with a dust-free cloth or alcohol cloth, cover the lens when the projector is not working, and clean the dust at the fan inlet;
If this issue persists, please contact Ultimea customer support at firstname.lastname@example.org for further assistance. Please make sure to mention that you have tried the steps in the FAQ so that our agents do not ask you to repeat these steps.