MacBook Pro USB-C > VGA >DVI issue

Discussion in 'MacBook Pro' started by sportsfanMAW, Jan 19, 2017.

  1. sportsfanMAW macrumors regular

    Joined:
    Dec 27, 2006
    #1
    Hi all,

    I just got anew MBP 13" (no touch bar) and I'm trying to hook it up to my external monitor. I have an old (really old) apple display like this that connects via DVI. I purchased Apple's USB-C > VGA/USB/USB-C adaptor and then got a VGA to DVI connector off of amazon to daisy chain the display to it. However, it doesn't seem to be working. The weird thing is that the MBP is detecting the display because it shows it in the arrange windows portion of the system presences, but it's not showing anything on it.

    I tried connecting it to another external monitor via DVI and got the same issue. Is there any reason this shouldn't be working?

    Thanks!
     
  2. BorderingOn macrumors 6502

    Joined:
    Jun 12, 2016
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    BaseCamp Pro
    #2
    What are the specifics of the adapters you are using? You can't convert VGA to DVI by simply adapting the connectors. Some video cards are compatible with these adapters because they do the conversion internally when the adapter is connected.

    The easiest thing would be a USB-C to DVI adapter.
     
  3. sportsfanMAW thread starter macrumors regular

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    Dec 27, 2006
  4. kTran33 macrumors newbie

    Joined:
    Jan 19, 2017
    #4
    Are you sure your DVI cable and monitor port can handle the analogic signal ? It needs to be DVI-I or DVI-A.
    wikipedia : The analog pins are the four that surround the flat blade on a DVI-I or DVI-A connector.
     
  5. sportsfanMAW thread starter macrumors regular

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    Dec 27, 2006
    #5
    Interesting. So perhaps I need this adaptor instead?
     
  6. BorderingOn macrumors 6502

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    BaseCamp Pro
    #6
    Are there any monitors that take the analog signal from a DVI-A? OP's problem is going the wrong direction, I think. A DVI source that also provides the analog could be adapted, but not the other way.

    OP, that adapter can't convert analog VGA to Digital DVI so your best bet is probably to go from USB-C to DVI unless someone has a better suggestion.
     
  7. kTran33 macrumors newbie

    Joined:
    Jan 19, 2017
    #7
    There are monitors taking DVI-A but not a lot I guess.
    OP : I tested a usb-c to DVI adapter without success (from ICZI), no max resolution and some flickering issues, but it seems to be working for some other people, give it a try ? Or maybe try a usb-c to DVI cable instead of an adapter ?
     
  8. kTran33 macrumors newbie

    Joined:
    Jan 19, 2017
    #8
    You have to be sure your cable is also compatible and that your monitor has indeed the DVI-A or DVI-D connector (check for the little holes around the flat blade). If all is set to transmit the analog signal, it shoud be fine.
     
  9. jerryk macrumors 68020

    Joined:
    Nov 3, 2011
    Location:
    SF Bay Area
    #9
    Seems like you are taking the long way to get a digital signal from you computer to your monitor. You are going digital->analog->digital. Each transformation increases the possibility of timing and signal errors. Why not get a USB-C to DVI connector? Then it is digital all the way
     
  10. sportsfanMAW thread starter macrumors regular

    Joined:
    Dec 27, 2006
    #10
    Ok so I order a USB-C to DVI connector but there's an issue. My desktop shows up on the monitor but it flickers the entire time and it makes everything stutter on the actual MacBook display.

    So I went out and bout a USB-C to Thunderbolt 2 adaptor and plugged in my DVI > Minidisplay port adaptor (that I was using on my MacBook Pro before the current one) and I don't get any signal coming through. Can anyone help me with this? I'm at a loss and really can't afford a whole new monitor
     
  11. sportsfanMAW thread starter macrumors regular

    Joined:
    Dec 27, 2006
    #11
    In case anyone comes back with the same issue, here's how I solved it. I bought a USB C -> HDMI dongle and then got an HDMI > DVI adaptor. Talk about a hassle but it all works fine now
     
  12. jngphoto macrumors newbie

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    Jan 21, 2009

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