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RGB2YUV Converter Problem

Discussion in 'Cables & Switches' started by shaunr, Oct 16, 2004.

  1. shaunr

    shaunr
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    Hi, i posted this in the Projectors forum but thought you guys may be able to help..


    I'm having problems with my H56 and a Scart RGB to (Y-U-V) converter (a CSY2100 that i bought from the frorums).

    I've tried my Xbox, Samsung HD935 and Pace Cable box but the colours are always messed up. The projector accepts Component directly from the Samsung into either the DVI input or D15 (with adaptor) but nothing works via the converter. I've tried every type of cable quality and can't see anything that needs enabling in menus.

    Please could anyone shed any light on what the problem may be?

    Thanks,

    Shaun

    Thanks,
     
  2. MarkE19

    MarkE19
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    All display devices are different, but on my plasma the D15 and component inputs can be configured to accept Component YUV, RGsB & RGBHV. Could the H56 be setup to accept RGB instead of component YUV?
    Also do you have the correct YUV cables in the correct sockets on the converter? If the cables are connected incorrectly you will also get the wrong colours.

    Mark.
     
  3. hornydragon

    hornydragon
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    I assume your scart is fully wired, good quality and devices are set to RGB output and you have red to red, green to green etc
     
  4. shaunr

    shaunr
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    Thanks for the replies. Yes scart is fully wired, i've tested with my tv (it displays an additional setup option when receiving an RGB signal).

    So far i've tried cable box, xbox and Samsung 935 and all the colours are messed up. The H56 displays perfectly when using the direct component output from the Samsung.

    I've also bought a component out for my xbox and that work perfectly too.

    Got me puzzled this one..

    Shaun
     
  5. hornydragon

    hornydragon
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    I would take some screen shots and email them to Dr John....
     
  6. shaunr

    shaunr
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    Excuse my ignorance, but who is Dr John? :)
     
  7. hornydragon

    hornydragon
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    He i sthe man who designed and sells the JS Technology converters...... that are probably the best in the business before you get into Iscans and scalers......... He will most probably have seen the effect in one of his prototypes or similar see forum sponsor list for a link to his website.
     
  8. Joe Fernand

    Joe Fernand
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    shaunr

    I note your RGB to YUV converter is labelled as Y, B-Y and R-Y - whereas the H56 is compatible with YPbPr Component analogue signals; possibly the two devices are incompatible.

    Best regards

    Joe

    PS I take it you have tried switching the Red and Blue cables around?
     
  9. shaunr

    shaunr
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    Hi Joe,

    Thanks for the reply.I've tried swapping the cables round but the pic is just green? Isn't YUV the same as YPbPr (as per Js Technologys site)?

    My projector says it takes Analog YPbPr via the VGA and DVI terminals.

    What do i need to hook up my cable box?

    Thanks again,

    Shaun
     
  10. symanski

    symanski
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    Hi Shaunr,

    I'm Dr John (Sim). I've seen similar effects from similar equipment, and yes, when prototyping units too.

    Essentially, this comes down to what is component video? There's many different labels for the same signal, but YUV/YPbPr is very different to Y,B-Y,R-Y. Although both are often refered to as component. The other label, YCbCr, is similar to YUV but only exists on a computer. Cb and Cr have a negative component which should be stored as a real number, but this would take up more memory. Therefore, they use an integer value but have an offset. As long as you know about this offset, you can easily manipulate the data.

    I would suggest that you change over to a true RGB to Component (YUV) converter.

    All the best,

    Dr John Sim.
     
  11. shaunr

    shaunr
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    Hi Dr John,

    Thank you for the detailed reply. I guess i have a converter for sale : )

    I'm not sure what the forum rules are around recommendations but would you mind sending me a private message if your product fits the bill.

    Cheers again,

    Shaun
     
  12. hornydragon

    hornydragon
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  13. shaunr

    shaunr
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    Cheers H :)
     

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