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Church and H.O.W. – Forums for HOW Sound and AV - Your Displayed Name Must Be Your Real Full Name To Post In The Church and HOW Forums => H.O.W. AV => Topic started by: Bill Beach on February 25, 2018, 08:08:14 pm

Title: lines on 1 of 5 video projectors
Post by: Bill Beach on February 25, 2018, 08:08:14 pm
we have 5 projectors all fed from the same signal through a component video splitter. one of the five has lines running bottom to top.  this is a rather new issue (couple of weeks, maybe a month)  no changes for video signal or electrical have been made.
we also feed 2 of the 5 projectors with a signal from our camera setup.  these 2 projectors are receiving the computer signal only when the preacher is preaching.  the same projector has more pronounced lines, and in various colors.  two projectors with signal from same place and one shows clear video, the other has lines in the image.
at this point I am just looking for a good place to start.
one thing I will try tomorrow will be to switch projectors the culprit from right side with the good one from left side.
beyond that any suggestions are greatly appreciated.
Title: Re: lines on 1 of 5 video projectors
Post by: Erik Jerde on February 25, 2018, 10:39:39 pm
we have 5 projectors all fed from the same signal through a component video splitter. one of the five has lines running bottom to top.  this is a rather new issue (couple of weeks, maybe a month)  no changes for video signal or electrical have been made.
we also feed 2 of the 5 projectors with a signal from our camera setup.  these 2 projectors are receiving the computer signal only when the preacher is preaching.  the same projector has more pronounced lines, and in various colors.  two projectors with signal from same place and one shows clear video, the other has lines in the image.
at this point I am just looking for a good place to start.
one thing I will try tomorrow will be to switch projectors the culprit from right side with the good one from left side.
beyond that any suggestions are greatly appreciated.

Swap outputs on your DA first.  That’s easy and will tell you if the problem is up or downstream from the DA output.  If it’s downstream and you’re using installed cables then before swapping PJs just bring the bad one close enough to the DA that you can connect it to different (known good!) cables.  If it goes away then cables are your problem.  If it stays then PJ is the problem.  If it has fixed inputs you’re kinda screwed.  If it’s cards you can swap from another unit.  If cards I’d swap before pulling it from the install location.
Title: Re: lines on 1 of 5 video projectors
Post by: Philip Roberts on February 26, 2018, 12:56:01 am
I'd also check to see if the lines appear in the projectors menus, logo and/or test patterns. If they do it means it's a problem internal to the projector.
Title: Re: lines on 1 of 5 video projectors
Post by: Bill Beach on February 26, 2018, 11:40:03 pm
I'd also check to see if the lines appear in the projectors menus, logo and/or test patterns. If they do it means it's a problem internal to the projector.
I tried the projector with menu etc on the screen and didn't see any lines.  put up a slide from the computer and, again, no lines.  was going to go upstairs to give the projector a video feed.  to have a decent picture from the camera, I turned on the stage lights.  and what to my wondering did I see lines moving across the screen.  worship leader said plug into a different place, and, the lines went away!  didn't have time to track down today but will get back to it soon.
Title: Re: lines on 1 of 5 video projectors
Post by: Erik Jerde on February 27, 2018, 11:08:21 am
I tried the projector with menu etc on the screen and didn't see any lines.  put up a slide from the computer and, again, no lines.  was going to go upstairs to give the projector a video feed.  to have a decent picture from the camera, I turned on the stage lights.  and what to my wondering did I see lines moving across the screen.  worship leader said plug into a different place, and, the lines went away!  didn't have time to track down today but will get back to it soon.

You had said in your first message that there were no electrical changes.  Did you mean in the entire building or just in areas you work in?  Also, any new lighting fixtures?  Could also be a fixture with a power supply that's going bad. 

If there were electrical changes in the building those could cause a problem.
If new fixtures turn them off and see if the problem goes away.
Assuming you have discrete controls of the lighting turn fixtures on and off individually to see if they cause problems.  If you can chase it down to one fixture then DC that fixture.
Title: Re: lines on 1 of 5 video projectors
Post by: Jordan Wolf on June 19, 2018, 10:44:19 pm
...worship leader said plug into a different place, and, the lines went away!
When you say “plug into a different place”, I assume you mean that you used a different outlet for power.

What gear did you change outlets with? The video signal distribution gear, the projectors, etc.?

If /When you try to replicate the issue, I think you’ll find that the lines will be faint or nonexistent when the grand master fader is near 0% or 100%; it will likely be the worst when at 50%.

My experience has been that analog video signal systems like VGA and Component are more adversely affected by the hash that some lighting dimmers throw back onto the neutral of the electrical system than the newer digital ones.