Alubook miniDP to RGB with RGB to VGA cable

Discussion in 'MacBook' started by Beanlok, Mar 28, 2009.

  1. Beanlok macrumors regular


    Nov 28, 2008
    I bought an rgb minidp adapter for the sole purpose to hook my macbook to my tv. I now have an extra lcd monitor that I plan to use as well. However, when I use a vga to dvi cable the monitor gets no signal. When using a straight vga cable it works fine. Has anyone else had this problem? Know a fix?
  2. spinnerlys Guest


    Sep 7, 2008
    forlod bygningen
    How do you connect the LCD to your MacBook?

    If I understood correct, you use a miniDisplayPort to RGB adapter which you then connect to a VGA to DVI cable.

    Why don't you just use a miniDisplayPort to DVI cable, so the signal doesn't loose.

    The way you do it (if I understood correctly), the digital signal is converted to analogue and then again shall be converted to a digital signal.

    PS: How do you connect the VGA to DVI cable to your MacBook?
  3. NewMacbookPlz macrumors 68040


    Sep 28, 2008
    You cannot go MDP--->VGA-->DVI.

    Generally, those DVI-->VGA cables are meant to go that way, from a DVI-I source to a VGA receiver, not the other way around, I think. Also, the monitor may not support DVI-A (analog signal over DVI).

    Conversely, you also cannot go MDP-->DVI-->VGA, as the DVI signal outputted by that connector is only DVI-D, and cannot be passed through to an analog VGA cable.

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