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Connecting 2 monitors to a single VGA output

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Villette54 Posted messages 300 Registration date Status Membre Last intervention -
Pierrecastor Posted messages 10830 Registration date Status Modérateur Last intervention - 17 Jul 2014 at 08:36

Hello,

I assume this question has already been asked, but despite my research, I couldn't find what I was looking for.

I would like to know if it is possible to connect 2 monitors to a single VGA output, and if so, will the graphics card recognize this connection as two distinct monitors (so that I can choose the "Extended Desktop" option).

My graphics card (sorry, it's the work PC and I have no idea what graphics card it is) can manage two monitors because I currently have 2 monitors connected. The problem is that they are not the same monitors, one is 17" and the other is 19", but mainly one is connected via VGA and the other via DVI-D as those are the only two outputs on my PC.
We have just received new 22" monitors, but the issue is that these monitors only have a single VGA input.

Considering that DVI-D, which transmits a digital signal, is incompatible with VGA, which can only transmit an analog signal, I am desperately looking for an alternative solution (as changing the PC is out of the question). Any suggestions are welcome, otherwise, I'll have to keep my old 19" monitor with its DVI input...

Thank you in advance,

Have a good day.

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Réponse 1 / 4

Villette54 Posted messages 300 Registration date Status Membre Last intervention 28

Okay, too bad. Thanks anyway.

Is there another solution to solve my problem?? I read online that in some cases you can connect a VGA screen to a USB port via a signal conversion box. Unfortunately for me, I don't know enough about it to know if it's possible on my side or not... Can someone guide me?? Any help/information is welcome.

Thanks in advance.

JSmithJ Posted messages 4403 Registration date Status Contributeur Last intervention 728

I'm not familiar enough with that ^^

Réponse 2 / 4

JSmithJ Posted messages 4403 Registration date Status Contributeur Last intervention 728

Your graphics card will not recognize two screens on a single VGA output in any case. It will display the same image twice.
Contrary to what you might think, DVI-D to VGA adapters do exist.

Villette54 Posted messages 300 Registration date Status Membre Last intervention 28

Hello,

Thank you for your reply. I thought it was impossible to have 2 screens on the same output. However, can you tell me more about DVI-D to VGA adapters? I tried using a standard DVI adapter (which supports all types of DVI), and it yielded no results (no video input detected by the screen). After checking with my supplier, the analog/digital incompatibility was the explanation I received.

Thank you in advance.

JSmithJ Posted messages 4403 Registration date Status Contributeur Last intervention 728

I'm sorry, I confused DVI-D and DVI-I. You were right (and so was the supplier), it is impossible to convert DVI-D to VGA whereas with DVI-I it is possible.

To confirm, I found this: https://forums.commentcamarche.net/forum/affich-3078110-dvi-d-brancher-du-vga-sur-un-dvi-d

Réponse 3 / 4

Villette54 Posted messages 300 Registration date Status Membre Last intervention 28

Haut.

JSmithJ Posted messages 4403 Registration date Status Contributeur Last intervention 728

Well, in response: I didn't know about this system, but apparently it works, and you just have to search (CCM link and Fnac link)

https://lmgtfy.app/?q=Connect+a+VGA+screen+to+USB

Villette54 Posted messages 300 Registration date Status Membre Last intervention 28

Hello,

Thank you, but I had indeed done this research. The problem is that when you look a little deeper, you find everything and its opposite.
Some say it works without any issues, others say it doesn't work with LED screens, and others say that the adapter should be chosen based on the size of the screen.

That's why I was asking if anyone could shed some light on this for me.

JSmithJ Posted messages 4403 Registration date Status Contributeur Last intervention 728

The adapters may depend on the screen size (since it's an external card), but in no case would LED screens be a criterion... What is your screen in VGA?

Villette54 Posted messages 300 Registration date Status Membre Last intervention 28

It is a 22" LED screen --> The Philips 223V.

JSmithJ Posted messages 4403 Registration date Status Contributeur Last intervention 728

1920x1080? If that's the case, it's FHD...

On Fnac
"RESOLUTIONS UP TO 1600X1200"

On LDLC
"Supports resolutions up to 1280x1024"

You just need to look at the descriptions. There should be at least one that fits...

Réponse 4 / 4

infotech2 Posted messages 24 Status Membre

Is there a VGA with 2 inputs, and if so, why not?

Pierrecastor Posted messages 10830 Registration date Status Modérateur Last intervention 4 215

Hi

It was mentioned in the topic, and it doesn't work. A splitter cable only allows you to duplicate the same image on two screens, not to use multiple screens.

infotech2 Posted messages 24 Status Membre

I am convinced that this does not work in this case, but solving this problem can help many people who have the same issue.

Pierrecastor Posted messages 10830 Registration date Status Modérateur Last intervention 4 215

It can help people who want to have the same image on two screens, which is not the case here.

We try our best to answer the question asked. ;-)

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