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Author Topic: HELP NEEDED ASAP: VGA-HDMI scaler randomly flashes black on screens  (Read 509 times)

Brian Larson

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I'm running two client laptops into two vga inputs on a Kramer VP728 switcher/scaler then out through the HDMI into an HDMI Splitter/DA to a projector and two LED tvs. Client is complaining of the image on all screens going black for about a second every few minutes.

Anyone have suggestions on what could be causing this? I assume the switcher isn't enjoying having to convert the vga to hdmi. Are there settings I should play with in the switcher or laptops or tvs that could fix this?

Event is happening now so any help is greatly appreciated. Thank you!
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Steve Kennedy-Williams

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Re: HELP NEEDED ASAP: VGA-HDMI scaler randomly flashes black on screens
« Reply #1 on: July 10, 2017, 12:31:51 pm »

I'm running two client laptops into two vga inputs on a Kramer VP728 switcher/scaler then out through the HDMI into an HDMI Splitter/DA to a projector and two LED tvs. Client is complaining of the image on all screens going black for about a second every few minutes.

Anyone have suggestions on what could be causing this? I assume the switcher isn't enjoying having to convert the vga to hdmi. Are there settings I should play with in the switcher or laptops or tvs that could fix this?

Event is happening now so any help is greatly appreciated. Thank you!

Work the signal chain. Since both screens are blacking simultaneously, start with the DA. Feed a laptop into the DA and see if the signal stays good. Next bypass the VGA input and send a test signal from the Kramer and see if it glitches. If not, try the laptop into the scale via HDMI. Lastly swap VGA cables and see if was a bad/loose VGA connection.

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Ray Aberle

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Re: HELP NEEDED ASAP: VGA-HDMI scaler randomly flashes black on screens
« Reply #2 on: July 11, 2017, 11:39:48 am »

I know with BMD mini/micro (HDMI-SDI) converters, there's a situation where they'll do something similar, and it's because of the HDCP protections inherent with HDMI outputs from a computer. But, since you are using VGA to the switcher, that's most likely not the problem. (The projector and displays will not have a problem with HDCP, and even if the switcher introduced it, typically an HDMI splitter will remove HDCP, not introduce it.)

I think it'll end up being something resolution related that's freaking all of the displays out. :-(
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Cailen Waddell

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Re: HELP NEEDED ASAP: VGA-HDMI scaler randomly flashes black on screens
« Reply #3 on: July 11, 2017, 12:34:12 pm »

My experience with Kramer equipment is that they do not often handle 1080 P well.  Regardless this sounds like an HDMI handshake problem where the TVs are constantly re-syncing with the Kramer unit or the DA.  Check your HDCP settings


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