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vertical lines on tv

Discussion in 'Electronic Repair' started by [email protected], Dec 29, 2005.

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  1. Guest

    Hello. I'm using ATI's tv wonder ve, which I have been using without
    any problems for over a year. A few months ago I started getting
    vertical lines on all channels. The tv tuner card is connected to
    cable tv, with the reception being fine on the other tv it is connected
    to. Are the lines I'm getting due to the tuner, or interference of
    some sort?

    Here are some screenshots of the problem
    http://www.geocities.com/tom24_ca/lines1.bmp
    http://www.geocities.com/tom24_ca/lines2.bmp

    Thanks
    Tom
     
  2. Noozer

    Noozer Guest

    Could be that the TV signal is too strong, or that there is "ingress".

    If possible, swap the cable between the computer and TV and see if the
    interference moves - that means bad cable or splitter. Could also just be a
    loose connection or bad cable end.
     
  3. MTBlood

    MTBlood Guest

    That's what I would suggest. One sure way to check ingress is to tune
    the tv to a channel that you can get off air. If it is worse, or if only
    off air channels have the problem then you have an ingress issue. Check
    for loose connections, bad splitter, or even an exposed core (especially
    if you have a high squirrel population).
     
  4. Paul Murphy

    Paul Murphy Guest

    What do they make your cables out of... the Squirrel population there must
    be especially mal-nourished! I've seen such lines caused by power supply
    issues within the PC but I'd also check alternative inputs (such as testing
    the PC at a friends house) before going down the PSU path.
     
  5. Mark

    Mark Guest

    vertical lines are a symptom of interference at or very near the
    horizontal rate.

    Do the lines move slowly or are they still?

    My guess is that the shield has come loose on the F connector of the RF
    cable feeding the tuner and is picking up interference from the logic
    circuits in the computer or from the sweep circuit in the monitor.

    Mark
     
  6. MTBlood

    MTBlood Guest

    I've seen drops chewed almost in two because of squirrels. Ingress is
    horrible at that point. When a sub calls with a particular channel out I
    check the drop and 9 times out of 10 it is chewed.
     
  7. We had some .750 super trunk cable chewed so bad that the remaining
    aluminum fused and took out over half of our cable system. The damaged
    cable was replaced, and the squirrels chewed through the new wire in
    less than a week. After that repair they smeared the wire with poison
    to stop the chewing. Our guys were tired of the emergency repairs at a
    busy intersection near downtown Cincinnati, oh.

    --
    Service to my country? Been there, Done that, and I've got my DD214 to
    prove it.
    Member of DAV #85.

    Michael A. Terrell
    Central Florida
     
  8. Guest

    Thanks for the replies. The lines are stationary and spaced about a
    quarter of an inch apart. I just took out the tv tuner, and replaced
    the cable to rca adapter that was in there. It seems to have made a
    noticeable difference, although I still can faintly see the lines on
    higher channels. I think the problem is either with the tuner, or EM
    interference. Maybe shielding of some sort will help.
     
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