The facula of projector may be caused by many reasons, such as dirty lens, poor heat dissipation of projector, dust and so on. The following are several ways to solve the spot problem:

1. Cleaning the lens: gently wipe the lens surface with a clean cloth to remove possible stains and fingerprints.

2. Replace the light bulb: If the projector is used for too long, the light bulb may have reached its service life and needs to be replaced.

3. Heat dissipation and cleaning: use compressed air tank to clean the periphery of the machine surface and vents to ensure good heat dissipation.

4. Reduce the brightness of the projector: too high brightness of the projector will increase the probability of light spots, and reducing brightness can reduce the appearance of light spots.

5. Replace the filter: Dust in the air can easily gather on the filter of the projector. If the filter of the projector needs to be cleaned and replaced.

Speckle is a common projector problem, but in most cases, it can be solved by simple cleaning and maintenance. If these methods can't solve the problem, it is recommended to ask professionals to carry out maintenance.