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TV-experiments

Discussion in 'Electronic Repair' started by Jzz, Sep 24, 2007.

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  1. Jzz

    Jzz Guest

    Hello all,

    I have been trying to materialize my (maybe wicked) ideas. I am trying
    to use a broken tv and a spare monitor (LCD) to watch television. This
    means that I use the reception print of the TV only, to convert the
    antenna signal and the monitor to watch these. It works (simply as an
    extra monitor), but I the monitor does not display videotext. This is
    not the biggest problem, I also cannot see the OSD of the TV. For
    example the menu to seek programs... This is a problem.

    Does anyone have any ideas? I have been thinking in the direction of
    connection some wires in the SCART (the only output of the TV print).
    But which? and where to?

    Hope to get some reactions,

    Jzz
     
  2. Adrian C

    Adrian C Guest

    Two problems

    1. Within the original TV tuner, videotext and OSD are RGB signals.
    These are not normally output on the SCART connector - you would have to
    arrange this.

    2. If your LCD monitor is using CVBS then you will need to mix these RGB
    signals. Could be difficult, it is unlikely your monitor has a "fast
    blanking" input that might help here. However, you could use the LCD
    monitor's RGB input (VGA socket?) and manually switch over to that input.
     
  3. Jzz

    Jzz Guest

    Two problems
    -----

    Thanks for the reply,

    Do you mean I have to arrange the signals to the SCART connector in
    the print or on the cable? The cable I can manipulate (quite) easily,
    but the print not.

    VGA socket is not the problem, I think (hope).

    Jzz
     
  4. Adrian C

    Adrian C Guest

    The RGB signals will be coming from the print (circuit board) from a
    graphics charactor generator chip. This will normally be connected to
    the TV's high voltage tube circuits, which you will need to disconnect
    and be very careful doing so.

    Then you may have to adjust the level of each signal for 0-0.7V drive
    for your VGA socket, and also provide horizontal/vertical
    synchronisation signal. Which also may be another problem - you need
    some practical experience here of understanding types of video signals
    and how to design interfacing circuits.

    You may find it a lot easier (and safer!) to work with an old video
    cassette recorder as a tuner and use on-line listings rather than videotext?
     
  5. Jzz

    Jzz Guest

    Good idea!

    It's just that I had this old tv available, but an old VCR is quite
    easy to come by, of course.

    Reading this I think it is not really realistic to try this.

    Jzz
     
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