Attaching a Compaq monitor via BNCs...

Posted on 2005-04-26
Last Modified: 2010-05-18
I have an old 17" Compaq monitor which has no model number on it that I can currently discern.  At the back are five female BNC connectors: white, black, red, green, and blue.  While this colour scheme is obvious, the cable I have for it consists of five male BNC connectors: one yellow and two pairs of red & black.

Could someone guide me to setting up which way around the connectors should go or point me in the right direction of a web site please?  It's fairly ugrent as my kids want to play games on a monitor that can show more than 640x480! :)
Question by:Barthax
    LVL 57

    Accepted Solution

    Hi Barthax,
    Very strange - the only BNC connectors Ive ever seen had a Red, Green, Blue, Horizontal, and Virtical connector on them??

    LVL 19

    Author Comment

    IIRC white is horizontal & black is vertical, which would tie in with your knowledge.  The problem I have is the cable itself, while having the five connectors, has two pairs of red & black plus a yellow. :(
    LVL 69

    Assisted Solution

    Since these are signal level voltages and you have an unorthodox color labelling, you can try plugging them in by trial and error.  There are only so many combinations with 5 plugs, each of which must be plugged in.  The horizontal and vertical will be obvious when you get them right - no flickering or scrolling; and red green and blue will be right when the colors come out right.

    You can also look at this pinout diagram and use a continuity tester on the BNC plugs to see which goes where:
    LVL 19

    Author Comment

    Well, I managed to get a set of cables correctly colour coded & the monitor appears to be dead! :(

    Many thanks for the help anyway. :)
    LVL 57

    Expert Comment

    by:Pete Long
    Bad luck :(

    Thanks Anyways

    LVL 19

    Author Comment

    For information, I've managed to configure someone else's monitor with the cable. :)  Turns out the following:

    Red & Black (1): Vertical (red) & Horizontal (black)
    Yellow: Blue
    Red & Black (2): Red (red) & Green (black)

    There's still no distinguishing between the pairs of red & black cables though. :(
    LVL 19

    Author Comment

    D'oh, sorry, my notes were wrong first time on the Horizontal/Vertical!  Here's the correct ones:

    Red & Black: White/Horizontal (red) & Black/Vertical (black).

    black = black - the only match of the lot! :)

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