MBP->MiniDisplayPort->Hdmi->DVI->VGA LCD externl…no pictureHere's the , what's wrong?

Discussion in 'MacBook Pro' started by NazgulRR, Nov 24, 2010.

  1. NazgulRR, Nov 24, 2010
    Last edited by a moderator: Nov 24, 2010

    NazgulRR macrumors 6502

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    Oct 4, 2010
    #1
    Here's the picture:
    [​IMG]

    I have a MiniDisplay Port to HDMI adapter, which I plug into HDMI-DVI adapter, which goes into DVI-VGA adapter to which I have connected VGA cable from LG LCD screen.

    MBP recognizes the external LCD LG screen fine, but the LG doesn't show any picture. I also tried with one other external VGA LCD screen. Same thing, no picture.

    I know 100% that VGA cable, VGA-DVI adapter and MiniDisplay Port-HDMI adapter all work. I cannot test the HDMI-DVI adapter anywhere though. Could it be the problem? Or is just that it's too many adapters?

    EDIT: Sorry for the huge picture.
     
  2. Hellhammer Moderator

    Hellhammer

    Staff Member

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    Finland
    #2
    HDMI - Digital
    VGA - Analog

    It doesn't work because the signal from MBP is digital while your monitor uses analog input. You need mDP to VGA to make it work
     
  3. jlw2387 macrumors member

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    #3
    Wirelessly posted (Mozilla/5.0 (iPhone; U; CPU iPhone OS 4_2_1 like Mac OS X; en-us) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8C148 Safari/6533.18.5)

    I found out the hard way as well, I had a mDP to DVI with a DVI to VGA converter, and had to go out and buy a mDP to VGA to make it work.
     
  4. cube macrumors G5

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    May 10, 2004
    #4
    DVI-D: digital
    DVI-A: analog
    DVI-I: DVI-D + DVI-A

    So even if you have a DVI-I connector, if it's receiving only DVI-D on one side, and is expecting only DVI-A on the other (or vice-versa), nothing will be transmitted.
     
  5. NazgulRR thread starter macrumors 6502

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  6. aimbdd macrumors 6502a

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    #6
    Not enough adapters ;)
     
  7. NazgulRR thread starter macrumors 6502

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    #7
  8. Freyqq macrumors 68040

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    Dec 13, 2004
    #8
    works up to here:

    MBP->MiniDisplayPort->Hdmi->DVI

    DVI--> VGA doesn't work for the reasons listed above

    you need a minidisplayport-->vga adapter
     
  9. Freyqq macrumors 68040

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    Dec 13, 2004
    #9
    unlikely to work. HDMI is essentially DVI + audio.
     
  10. jlw2387 macrumors member

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  11. vant macrumors 65816

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    Jul 1, 2009
    #11
    Holy adapters batman!
     
  12. Bill Gates macrumors 68020

    Bill Gates

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  13. JamesGorman macrumors 65816

    JamesGorman

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    #13

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