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HDMI Signal drops

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Rodney Phillips:
At our church we run presentation software on a Windows 10 desktop and display on 2 ceiling mounted Optoma projectors.  For quite a while we have had a "blip" 2-5 times in an hour long service where the projector screens go blank for a few seconds.  It has been really annoying.  I have tried to figure it out and have swapped new equipment in and reconfigured on occasion but have not been able to figure it out.

With the virus concerns we needed to live stream this past weekend.  We have had the equipment for over a year but never fired it up.  During the streaming (which overall went great!), the live stream ended 3 times and I had to restart it.  I am thinking it is related to the "signal drop/blip" we normally see a few times during the service.

Over the past year or more I have replaced all of the equipment between the Windows desktop and the Optoma projectors with equipment a little higher quality hoping to eliminate the issue but have not solved the issue.

I have attached a PDF showing the architecture.  The top section, as noted in the diagram, was added last Saturday so this would not have been causing the issue all along.

Thanks for any help.
Rodney Phillips
Loudon, NH

Erik Jerde:
When you say you replaced the equipment does that include the cables?

An issue shared between both projectors (at the same time) indicates a shared piece of equipment. 

Have you tried a different computer?  How about a different resolution?  Are you running frame syncs on all the inputs to your switcher?  That may help you through a signal loss without killing your stream.

Rodney Phillips:

--- Quote from: Erik Jerde on March 16, 2020, 10:17:19 am ---When you say you replaced the equipment does that include the cables?

An issue shared between both projectors (at the same time) indicates a shared piece of equipment. 

Have you tried a different computer?  How about a different resolution?  Are you running frame syncs on all the inputs to your switcher?  That may help you through a signal loss without killing your stream.

--- End quote ---

Thanks Erik.

I have changed some of the cables but not all.  Mostly as I replace a piece of equipment.  I have thought about simply changing all.  Have seen different thoughts on what constitutes a "quality" HDMI cable.

This is the second computer with the same results.

I have not changed the resolution.

I am a good sound tech but much less knowledgable about video.  I will read up on frame sync.

Luke Geis:
10:1 it's your switcher. The lower dollar units just don't work all that well and heat seems to be the big reason. I have had issues with the ones like yours before. A way to test that would be to bypass the switcher and connect the computer directly to the Extender. As mentioned before, since all at once tends to quit, it is likely the first thing in line, which is your switcher.

Rodney Phillips:

--- Quote from: Luke Geis on March 16, 2020, 12:34:13 pm ---10:1 it's your switcher. The lower dollar units just don't work all that well and heat seems to be the big reason. I have had issues with the ones like yours before. A way to test that would be to bypass the switcher and connect the computer directly to the Extender. As mentioned before, since all at once tends to quit, it is likely the first thing in line, which is your switcher.

--- End quote ---

Thanks Luke.

I have bypassed the switcher before and I believe we still experienced an occasional blip.  Also, the signal does not drop for any length of time.  It is a quick blip which causes the projectors to have to re-acquire the signal.

There are a lot of switches out there, any suggestions on a higher quality one?  The current switch is itself an upgrade from a lower quality one.

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