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ntsc to rgb convertor problem

Discussion in 'Electronic Design' started by Hurleyautoaudio, May 24, 2004.

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  1. Any help is appreciated. I got some inexpensive ntsc to rgb convertor boards
    to convert and send dvd movie to gps screen on a customer's car. All is well
    with system-except a flagging on upper right hand corner of screen. It looks
    kinda like the corner of a page turned down. No other source can tell me what
    i need to do to get rid of this.

    -poor sycn
    -voltage mismatch
    -bad freq refresh


  2. Post a picture?
  3. Joerg

    Joerg Guest

    This looks like a horizontal sync problem. Cheap circuits often have poor sync
    separators. Can also be a goofed up black level clamp design where the H-sync
    chokes right after the long V-sync period.

    Try to connect the display directly with very short wires and see if it persists.
    Probably will. If it's any comfort I have just seen the same thing on a (probably
    expensive) inflight movie system.

    Anyway, you might have to redesign some of the card's circuitry or just obtain a
    better one.

    Regards, Joerg
  4. How about black masking tape ;-) ?
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