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Herringbone pattern (zig-zag in middle) on Samsung HCN4226wx.

Discussion in 'Electronic Repair' started by Jason D., Oct 28, 2004.

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  1. Jason D.

    Jason D. Guest

    Seen like that? Even my boss said this's new problem and said wow,
    Boss was hopeful it was signal quality but it is not.

    That annoying pattern is present in all inputs including tuner.

    Whole screen of herringbone pattern get finer and coraser pitch with
    time and switching among different input does this also. Herringbone
    pattern slopes from top then do a zig then zag back to same slant to
    countinue down to the bottom. The middle zig-zag band doesn't move up
    or down.

    Came in under warranty.

    I have photos. Did bit of research and got some little info.

    Cheers,

    Wizard
     
  2. <snippety>

    Herringbone patterns are often an indicator of outside
    interference from nearby radio transmitters, or other devices that emit
    RF signals of one sort or another.

    Have you tried feeding the set a controlled test signal (say,
    color bars and tone) inside a screen room to eliminate the possibility
    of outside grunge?

    Do you have a BPL (Broadband over Power Lines) trial going on in
    your area?

    Is someone running a microwave oven at the same time you're seeing
    the herringbones?

    Happy hunting.



    --
    Dr. Anton T. Squeegee, Director, Dutch Surrealist Plumbing Institute.
    (Known to some as Bruce Lane, ARS KC7GR,
    kyrrin (a/t) bluefeathertech[d=o=t]calm -- www.bluefeathertech.com
    "If Salvador Dali had owned a computer, would it have been equipped
    with surreal ports?"
     
  3. Master TV

    Master TV Guest

    Have you tried HD source and SVHS?
     
  4. Jason D.

    Jason D. Guest

    Yes, I made certain of that:

    The herringbone pattern is present in *all* of inputs including tuner.

    S-video
    Component
    Composite video
    Tuner

    So, what do you think that could cause this problem? Looked at
    schematic for this TV, still bit baffled.

    Our isolation transformer is bit unique, if it buzzed or made weird
    noises, that points to open main filter every time, not this time with
    this one.

    I do not have DVI cable, I'll have to source one and try again with my
    test PC machine on it, has DVI video in it, I use it very ocassionally
    to test DVI monitors, but this does works on samsung DLP.

    On other hand, I need to find a way to output 1080 resolution for
    convergence set up. All sets that supports 1080 requires both 480 and
    1080 modes done. All of them upconvert the NTSC and most inputs to
    480.

    Many sets I need to set up convergence need to be done in 1080 mode,
    what DVD players that is capable of 1080 output?

    Cheers,

    Wizard
     
  5. Jason D.

    Jason D. Guest

    Solved!

    Herringbone fault was in the scan processor board module. Costs
    168.xx cdn from samsung, our shop is samsung authorized servicer
    (warranty & customers). If it was exposed board instead of boxed into
    metal box, I'd probe for bad part and swap one part but no extender
    board and hard to access the chassis. Grrr.

    Cheers,

    Wizard
     
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