There are many reasons why your Viewsonic projector might not be properly projecting the picture. Check the projector’s video connections and cable You should check to make sure that you have not accidentally dropped any foreign objects into the lens area, as this could damage either the lens itself or the internal components of your Viewsonic projector that are housed in this area. If the lens is dirty or damaged, it can cause problems with your Viewsonic projector.
It only takes seconds to switch lenses, which makes this an easy fix if multiple lenses are available.
For models that have interchangeable lenses, try swapping out the lens for another one if there’s a chance that one of them has been damaged or has fallen off. If there is damage to the lens cover, you might need to replace it. Make sure the lens cover is completely clean and free of any debris like dirt, lint, dust, etc., before you try to use it again if this was the cause for the problem with your Viewsonic projector. 
If it doesn’t fit properly, you might need to get another one from the manufacturer or supplier that you got your unit.
Verify that the lens cover fits securely on your Viewsonic projector model. Loose or damaged lens covers are often the culprit for this type of problem. If the lens cover is not removed, it can cause interference with your Viewsonic projector. If all else fails, try using a backup electrical generator as there may be an issue with the electric company’s service or a substation that has been damaged or taken offline. Try a different power cord if you have one available to see if this is the source of the problem with your Viewsonic projector. To do this, you’ll need either a flashlight or some type of lamp turned on near the projector so you can see into it and see if there are any obvious issues like bent pins or broken connections where it plugs in. Verify that the power cord is securely connected to the projector’s back and to a working outlet. The unit may have been wired incorrectly from the factory, so make sure to check all connections and wiring, especially if you suspect that there has been a power surge or a problem with the circuit.
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