AVS Forum Special Member
Join Date: Jun 2005
Location: Northern, VA - Washington, DC
Mentioned: 91 Post(s)
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So, it's easy enough to find out if the screen is causing the issue. In fact, it's easy enough to find out if the projector is moving or the screen is moving.
Just measure off the wall to where the edge of the screen is. You should be able to get this down to about 1/8" or so.
Then, when the projected image is not correct, measure again. Is the edge of the screen in a different location? Is the edge of the image in a different location?
I would lean towards the projected image being in a different location, and I would expect that it is because your projector has shifted.
As mentioned in a previous post, if your projector isn't locked into place, it can shift. That can be vibrations of the fan, or because people are moving around the home, or a door slamming, or something else. It doesn't matter how firm your mount is, if the projector is just sitting on it, then it's not secure.
This is part of why good projector mounts matter. A good Chief mount locks the entire projector in place. Yes, on a ceiling that vibrates (like mine) it wiggles when people walk overhead. But, then it goes back to the position that I have it locked into. The question then becomes whether it is just the projector shifting, or the entire mount, or if some digital keystone corrections are getting reset which is screwing things up. I would lean towards the projector, as that's the lightest piece, but really, projectors should be on a very wide and heavy base which can't move at all, then they should be firmly attached to it. If you are in a location which allows the ground under it to move, then it is easily possible that a garage door or a front door opening and closing introduces a vibration which is causing the entire furniture piece to shift. In which case, the only real solution is to screw it into place and use a projector mount to lock the projector into position.
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