VGA to composite RCA cable

Discussion in 'The Projects Forum' started by OzSkunk, Jul 7, 2013.

  1. OzSkunk

    Thread Starter New Member

    Jul 7, 2013
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    Hi there guys...
    Ive searched google high and low but to no avail. ..

    My laptop has tv out through the vga port capability..but I have no cable..I know I can buy a cable but would rather make one...

    Q. What pins on the 15pin vga connector need to be joined?

    Im guessing the 3 rgb outputs go to the centre pin on the rca..and the earths go to the outer of the rca..

    Cheers
     
  2. MrChips

    Moderator

    Oct 2, 2009
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    Did you try "VGA to composite" on Google?
     
  3. OzSkunk

    Thread Starter New Member

    Jul 7, 2013
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    Yes looked at hundreds of pages..and theyre all the same...half saying it cant be done or buy one or u need a convertor etc etc...diagrams for component (not composite) or b/w etc...

    Its so basic but theres no clear info out there...
     
  4. Paul Kerry

    Member

    Jan 9, 2012
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    The information you require should be in the user guide or on the manufacturer of your laptops website, you maybe lucky!
     
  5. MrChips

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  6. OzSkunk

    Thread Starter New Member

    Jul 7, 2013
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    Nope checked there...gives pinouts of the vga port but I need to know which pins to join where...
     
  7. OzSkunk

    Thread Starter New Member

    Jul 7, 2013
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    Yeah ... I only need a passive not active connection. ..

    Its just a simple lead...
     
  8. MrChips

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    Oct 2, 2009
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    You cannot get colour composite with just a passive circuit.
     
  9. bertus

    Administrator

    Apr 5, 2008
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    Hello,

    You can not just join some pins.
    You will need a circuit like the one MrChips gave you.

    Bertus
     
  10. Paul Kerry

    Member

    Jan 9, 2012
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  11. OzSkunk

    Thread Starter New Member

    Jul 7, 2013
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    Usually yes but the chipset I have does the conversion...
     
  12. OzSkunk

    Thread Starter New Member

    Jul 7, 2013
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  13. MrChips

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    You can electronically combine the RGB signals along with the HSYNC and VSYNC to give you B/W composite.

    You cannot do the same to produce colour because you need to produce luminance and chrominance and you have to add colour burst signal.
     
  14. Ramussons

    Active Member

    May 3, 2013
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    Ref: https://en.wikipedia.org/wiki/VGA_connector

    Your PC Cannot have TV Out on the VGA 'D' Port. The 15 pin connector will connect to only a display that has a 'D' connector.

    The signal levels on the EGA connector are Digital (0/5 Volts) whereas your TV input will be 1.0 V p-p (+.7 Video, -.3 Blanking)

    TV out can be on a RCA (composite video) or 'S' video output; and in some cases SCART.

    You will need to process the VGA output as MrChips has stated to derive a 'S' video out.

    Ref: http://www.wikihow.com/Use-Your-TV-As-a-Computer-Monitor

    Ramesh
     
  15. Paul Kerry

    Member

    Jan 9, 2012
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    It depends on which pin your laptops chipset uses when set to TV out, this is why I originally suggested your manufacturer. You may have to buy the correct cable for your machine if you can not find the information. Most laptops I've seen have an RCA socket on them for TV OUT, if it's supported.

    The driver may support TV out, but the hardware may not. It is not unknown for there to be one driver that supports several versions of one chipset. If your chipset does not have TV OUT, then the circuit by MrChips is the only way I can see of doing it.
     
  16. OzSkunk

    Thread Starter New Member

    Jul 7, 2013
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    Yes thats how I thought it was done...buy using some of the unused pins..but then I changed to the idea it is combined. .

    Heres the pinout..not sure if its different or not
     
  17. Paul Kerry

    Member

    Jan 9, 2012
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    The Dell Vostro 1200 does not mention anywhere in the specs that it is TVOUT capable, the only way would be the one suggested by MrChips.

    Sorry
     
  18. OzSkunk

    Thread Starter New Member

    Jul 7, 2013
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    Lets say if it did..how would it be connected?...
     
  19. Paul Kerry

    Member

    Jan 9, 2012
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    Knowing Dell there would either be an SVHS connector or RCA on the machine somewhere
     
  20. wayneh

    Expert

    Sep 9, 2010
    12,154
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    Or a long lost rat-tailed adapter somewhere. ;)

    [​IMG]
     
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