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TDA 1170 Vertical Question

Discussion in 'General Electronics' started by unix-freak, Aug 2, 2003.

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  1. unix-freak

    unix-freak Guest

    Greetings all,

    I have a monitor (Videoteknik) that I've been working on...and making
    progress - I might add. It was a non working monitor when I got it, now it's
    making pretty pictures....except....

    When I have still video inputting it...the picture holds steady. When I have
    moving/changing video..the picture shift vertically. I can scope the amp
    output of the vertical IC and it shifts proportionally to the shifts on the
    tube. It equates to 15 lines by my calculations.

    The amp input also is shifting. It seems to shift whenever there are changes
    from a bright image to a dark..or vice-versa.

    I have no schematic...nor can get one. Does this sound like a problem in the
    sync seperator circuit...or just a bad vertical cap or two?

    Thanks in advance.
  2. Check the path of the video signal for any tilt in the vertical
    interval. Trace through the sync separator, and follow though to the
    vertical sync to the vertical scan generator.

    A common fault condition in TV sets and monitors is where there is a
    loss of low frequency response in the video or sync path conserning
    the vertical sync. This type of fault can occure from this type of

    It is possible that there are some electolytic coupler or decoupler
    caps along the paths. An ESR meter to test the caps is the easiest
    way to locate the defective ones.

    As for schematics, most of the computer monitor companies, and a few
    of the no-name TV manufactures will not sell or distribute copies.

    Jerry Greenberg
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