One screen (of 3) flickers on and off when QLab plays but fine with desktop.

[Amir Sherhan]

Hello,

I'm having a little trouble with a screen. When I'm on the desktop I can easily drag windows over to the second screens and everything is fine. However when I play a Qlab file (jpeg or video), the screen flickers between playing the image and showing black.

The very odd thing is that bringing up the settings menu on the TV doesn't display it while the stack is running. If I stop the cue stack then the menu appears and I can drag windows around fine again.

The flickering is not in any kind of pattern.

There are 3 displays. 2 are mirrored, these work fine and play the content with no issues. These 2 displays are the same. The third display is different.

I'm running QLab 2. Mac OS X 10.7.5.

The chain is Mac - triplehead2go - | - DVI out - kramer HDMI video extender - cat7 - kramer HDMI receiver - 2 HDMI outputs going to mirrored displays. (this chain works)

                                                  | - center output not being used

                                                  | - DVI out - HDMI video extender - cat5 - HDMI video receiver - HDMI to DVI in to TV (this is the chain that does not work)

My main confusion comes from it working fine for the desktop but not working for QLab and it's also odd that the TV menu's don't come up as a result of the flashing.

Any help with this would be very much appreciated.

Thanks,

Amir

[Michael Long]

On Wednesday, March 5, 2014 7:05:39 AM UTC-5, Amir Sherhan wrote:

I'm having a little trouble with a screen. When I'm on the desktop I can easily drag windows over to the second screens and everything is fine. However when I play a Qlab file (jpeg or video), the screen flickers between playing the image and showing black.

I had a similar problem a few months ago. We were sending two signals to two different projectors, one of which was brand new. The brand new projector would sometimes flicker when fading from black to the image, but sometimes it wouldn't. We tested every single hardware component individually before we discovered that it was in fact the brand new projector that wasn't working properly. We bought a new brand new one, and all was fine.

So I would imagine you have some sort of failed piece of hardware in your chain somewhere. You'll probably need to go about the grueling task of testing each component of your failing chain in the working chain until you can recreate the problem on your working chain. Oh, and it couldn't hurt to make sure there aren't any loose connections anywhere before you go about testing everything.

Hope that helps!

--
Michael Long
Projection Designer - Philadelphia