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I just bought a new DVI type D to VGA adapter to use my tv as a screen for the computer I use for a media server. It doesn't seem to be working out of the box. My first thought was that the adapter was bad, but I wasn't sure if I needed to go into my video preferences on my computer and tell it I'm using DVI for my output or if this would be redundant. I have tested the cables, computer graphics card etc to make sure they all work. Thanks for any help!

Os is XP Pro, the video card isn't anything special, just whatever came built in to the IBM motherboard. TV is a Samsung Model number:TXP2670WHX/XAA

Well the output on the computer is VGA, that's why I bought the adapter, the TV has a DVI input. There is only one video output on the computer.

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Did you plug it into the wall? –  Ignacio Vazquez-Abrams Mar 17 '12 at 3:09
    
What operating system, video card, and brand/model TV are you using? –  G Koe Mar 17 '12 at 3:11
    
XP Pro, the video card isn't anything special, just whatever came built in to the IBM motherboard. TV is a Samsung Model number:TXP2670WHX/XAA. –  Blake Mar 17 '12 at 3:14

3 Answers 3

up vote 3 down vote accepted

Based on your edits, you are trying to achieve the impossible. There is no way to convert VGA signal to DVI signal without a convertor box of some kind. It would be cheaper an easier to purchase an add-in card that will allow you to have a DVI output from your PC. This will work well for you.

I should have asked what adapter you bought, as the answer would have been immediately apparent.

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Couldn't he just use a VGA to DVI-I/DVI-A adapter? I've connected my VGA video card to a DVI/HDMI-only monitor and it works just fine. It's not a true digital signal, but the monitor displays it just fine (really no noticeable difference from a true DVI connection TBH). –  Lèse majesté Mar 19 '12 at 16:22
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If the display supports DVI-I, yes. But in the last few years I've come across displays that require DVI-D. (My experience is with computer monitors rather than TVs - my TV supports both VGA and DVI-I - but I'm certain that these devices exist.) –  user55325 Mar 21 '12 at 19:16
    
@user55325: True, there probably are devices that are DVI-A only. DVI-I support is probably more common in computer monitors than TVs since there's more a need for legacy support for VGA. And it's cheaper/more useful to provide 2 DVI-I jacks rather than 2 DVI-D jacks + 1 VGA jack or 1 DVI-D jack + 1 VGA jack. Nonetheless, it is possible on many displays to use a straight VGA-to-DVI-A adapter. –  Lèse majesté Mar 22 '12 at 10:02

Try booting the computer with the TV as the only display, and make sure that you have the VGA input selected on the TV.

If you do not see your Bios screen at least, there is somethign wrong with your VGA cable or the adapter.

Be aware Your TV only supports resolutions up to 1920x540 as it is a 1080i TV.

the integrated graphics hardware on older motherboards can have trouble with non-standard resolutions. If none of the above works, please post your Motherboard model or internal graphics card type.

Dvi to VGA adapters are very simple, but yours could be defective. Do you have another Monitor to try it out on?

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Okay thanks, I'll try that as soon as I can and post the results. I have tried it on another monitor and it works when using just the VGA but when I use the DVI adapter and plug it into a DVI monitor it doesn't. But I still wasn't sure if it would work anyway or if I still needed to set my video output to DVI. –  Blake Mar 17 '12 at 3:40
    
Does it work on the DVI monitor if you boot with only the DVI plugged in? –  G Koe Mar 17 '12 at 3:41
    
No it doesn't. I also tried rebooting it with the TV as the only display and still nothing. Let me see if I can get a number on the motherboard... –  Blake Mar 17 '12 at 3:44
    
Sounds like your DVI is disabled in the BIOS, or the DVI output is toast. –  G Koe Mar 17 '12 at 3:48
    
Okay it's an IBM NetVista 8319-52U motherboard. –  Blake Mar 17 '12 at 3:48

What type of adapter do you have? If it's one of the "passive" ones that come with graphics cards, it won't work with DVI-D-only devices, because DVI-D only carries a digital signal - VGA is analog video. Those types of adapters expect a DVI-I or -A output.

If the adapter has active circuitry to convert digital to analog video, what resolutions does it support? Does it need an external power source? (Is it possible you might be running into HDCP issues? I don't have any experience in that area.)

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It doesn't require an additional power source so I assume it isn't converting the signal in anyway. It's small and one end plugs into the VGA cable and the other end plugs into the DVI on my TV. –  Blake Mar 17 '12 at 3:57
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@Blake: As per this answer and this chart, it is possible to use a simple adapter to connect a VGA source to a DVI display. You just need to trade the VGA-to-DVI-D adapter for a VGA-to-DVI-A or VGA-to-DVI-I adapter. They're less than $20 usually, and it's cheaper than buying a VGA-to-DVI-D convertor box, which, even if such convertors are available, would not give you any better quality than a DVI-A adapter since you're starting with an analog signal to begin with. –  Lèse majesté Mar 21 '12 at 0:59
    
I actually had a VGA to DVI-I adapter before I even ordered the new one. But my tv will only allow DVI-D input. Thanks anyway though :) –  Blake Mar 26 '12 at 16:21

protected by nhinkle May 17 '12 at 15:52

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