TV-experiments

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

Reply to
Jzz
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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.

  1. 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.

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Adrian C
Reply to
Adrian C

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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

Reply to
Jzz

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?

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Adrian C
Reply to
Adrian C

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

Reply to
Jzz

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