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Stray Pixels

Discussion in 'TVs' started by GlennP, Aug 25, 2004.

  1. GlennP

    GlennP
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    Has anyone else noticed this? On a number of TVs there appears to be two stray pixels, one either side of the picture area about half way up the screen.

    They are only noticeable in widescreen mode when the picture area gets to the edge of the display area - they don't show in 4:3 or 14:9 modes.

    In Dixons and House of Fraser today it only seemed to be on Toshiba models but in Comet it was also present on Philips, Panasonic and Samsung. It's nothing to do with the shared feed as a sales guy in Comet connected up a DVD player and the pixels were still there.

    bboy-mass has confirmed he has these on his new Toshiba PF3.

    Does anyone know what causes this? Is it a tube problem?
     
  2. LV426

    LV426
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    Depends on the tube manufacturer. I don't know why they are there, but they are quite common. Nothing at all to do with the signal. And not a fault; just something about they way they are designed/built.
     
  3. GlennP

    GlennP
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    Thanks Nigel. I just noticed that the stray pixels are also present on my old 14" portable and I'd never noticed them before.

    Unfortunately, now I've noticed them once I can't help looking at them all the time. Aaaaargh!
     
  4. Tight Git

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    Better not get a Sony then!

    (Tie wires on the Aperture Grill.)

    Incidentally, I thought the phospher dots each side signified it was a Philips tube, but I could be mistaken.
     
  5. LV426

    LV426
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    TBH, although I've occasionally noticed their presence, I've never found Sony tie wires intrusive on TV. PC monitors are a different matter, though. Not that I use a Sony (or any other) CRT any more.

    As for the stray pixels - I guess you could always dab a marker pen on the relevant bit of the glass.
     
  6. GlennP

    GlennP
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    Sony, Sanyo and Loewe TVs seem to be the only ones I've seen that don't have the stray pixels/phosphor dots.

    I've seen them predominantly on almost all Toshiba models but they're also present on some Panasonic, Philips, JVC and Thomson models but not on all of their different models.

    My Philips 25" never had them but my older Philips 14" does - I'd never noticed them before but then again I hardly ever used the portable until the last week when my 25" died.

    Do different manufacturers use tubes from other makers and if so, I presume they use different makers tubes across their range. Confusing!

    The stray dots won't put me off buying a particular model but I'd still prefer them not to be there.
     
  7. Tight Git

    Tight Git
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    They certainly do!

    That's because tube manufacture is a very specialised process and so there are only a relatively few production facilities worldwide.

    ************************************

    Nigel,

    I'm also not fussed about the aperture grill wires (in fact I'm looking at a Mitsubishi Diamondtron right now!) but I know they annoy some people.
     
  8. GlennP

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    I've just had a reply from Toshiba to confirm why these stray dots appear which may be of interest to some of you.

    The stray dots are caused by manufacturing design, not a problem with pixels.

    "The black edge that you get around the TV screen is actually painted on so
    you don't see a jagged edge, it gives the picture a smooth edging. The two
    dots or square "chunks" missing off this are from when the screen was
    resting whilst it was being painted black, this is why you can still see
    the picture behind them. You will find this on most TV's about half way up
    the screen on the left and right hand sides"

    So from this, it appears that some tube manufacturers have found a different method of supporting the tube while the edge is being painted so that you don't get the resulting "chunks". Pity all the tube manufacturers can't do the same to get a more professional finish.
     
  9. Pug72

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    I thought they were there to help adjust overscan.
     
  10. GlennP

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    Not the case according to Toshiba.
     

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