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Topic: Random Pixelation From Multiple Computers?
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Joined: Oct 9, 2013
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A intermittent problem has popped up with the NEC VT660 that one of my supported groups use that has me at a loss. It never behaves erratically when I am present (of course) so this is all second hand information unfortunately and occurs intermittently.

The projected screen will become pixelated and stick on old programs that had been up like when changing applications or spreadsheets for example so it seems the computer is not refreshing the external display properly. The users have noted that only moving the mouse over what they want to show or like in a spreadsheet highlighting all the cells causes it to update and show the new information. Anything else on the screen stays static from the previous screen. Normally I would attribute this to the computer not outputting the display properly, but apparently when this issue is happening it does it with multiple computers. These computers are all normally used with it and worked before, and currently, when the issue is not occurring.

I am at a complete loss on this one, is there anything that might cause a projector to do have a display issue like this anyone more familiar with them can point me to? Poking around the internet I found some references to failing electronics for issues where it would not always display properly but nothing concrete and exactly like this. I need something substantial to justify replacing the aging unit for them if it is indeed a possible problem with the projector somewhere. If it were not intermittently happening with multiple computers at the same time I wouldn't even consider it a projector issue but it never hurts to cover all of your bases with technology these days.
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Joined: Mar 28, 2005
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Unfortunately, there is no simple answer to this.

As the projector is ten years old it could be related to any number of issues, but the most obvious are that it is experiencing a failure on the video board. More of a glitch really. The projector still has to process video as it enters the projector, and this video board sounds like it is getting hung up from time to time.

I would say that if you have not, you will want to be 100% certain that people are putting out 1024x768 video to this projector and not 1280x800 or some other strange resolution which didn't exist 10 years ago. That's a big deal, because in the past ten years we have shifted from 4:3 aspect ratio to 16:9 or 16:10 being the predominant aspect ratio used by computers. It is inexplicable to me that companies are willing to replace thousands of dollars worth of laptops every year, but won't replace a ten year old projector without first jumping through $1,000+ in labor figuring out if it needs to be replaced.

Replace the projector. New projectors, with a full warranty, new lamp, higher brightness, and native widescreen resolution, can be had for under $1,000.

It may require a new screen as well, which may prove to cost a fair bit more.
AV Integrated - Theater, whole house audio, and technology consultation during the build and installation process in the Washington, DC metropolitan area.
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Thanks for taking the time to answer such a broad and poorly explained question. That is about all the answer I expected though the point about resolutions is a valid I will have to make sure they are using as close to native as possible. Since it had not been doing it before or after when I was present I had not checked into that one. It is unfortunate it takes so much work to replace something (though believe me the laptops are near as if not older than the projector itself) but I had not been thinking of the fact it probably does have some built in processing for the signal it receives that might be causing the problem. Hopefully it will finally do it when I am available so I can poke around it a bit more firsthand and get some observations if nothing else that I could argue for one.

Thanks for your time!