Diffraction with Projector?

[berand]

Has anybody else had issues with diffraction lines and their projector? I had mine mounted (with the short throw projector). I know that the projector is close, but lines appear to repeat multiple times to the right of the actual image. Is there a calibration I'm missing for this? Thanks!

[markrobinson]

Check that there are no loose connections with the cables first. I have seen this when that is the case.

It may be intererence from something else electrical on your electrics. Try switching a few electrical things off to see if that is the culprit.

After that, probably worth ringing support

[excelteacher]

You may also want to run your hand over the surface of your board to feel if there are any "bubbles." When I inherited a former teacher's Promethean board, I had the same diffraction issues. When I looked at the board, there were two distinct humps which were the culprit. Our installers had me document the weird issues I experienced for a few months. Thankfully, the board was still under warranty and was replaced.

[LWeiner]

We adjusted the screen resolution (to lowest number of pixel psi as possible) then re-calibrated; it seemed to take care of the issue.

[tcampbell]

I had a similar problem and found it was a bad splitter. It could also be a bad cable. Try to swap out the cable so you can have a higher resolution image.