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tosh 56 incher - edge colouring

Discussion in 'Televisions' started by Duncan Harvey, Dec 17, 2001.

  1. Duncan Harvey

    Duncan Harvey
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    I've had a tosh 56 WHO8B now for about 3 weeks and am generally happy with it.

    One small quibble though. On screen edges often have a greenish or red "outline" which can be somewhat distracting.

    I dont think its the convergence.

    I didnt have this problem with my sony 41 inch rptv, but then again there is a considerable difference in size.

    the edges are most obvious on digital tv (ondigital) and DVD - hardly watch analogue as our reception is quite poor.

    anyone any idea?
     
  2. Meldrew_Lives

    Meldrew_Lives
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    Had a similar experience with my 46WH08B before it finally packed up after a whole two and a half weeks. Frankly I think Toshiba ship a load of crap.
     
  3. JohnS

    JohnS
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    "One small quibble though. On screen edges often have a greenish or red "outline" which can be somewhat distracting."

    This is almost definately convergence, when you did the service menu convergence did you let the tv thoroughly warm up first ie >1/2 hour. If you did, has the set been moved, I often move mine slightly towards my sitting position but this does occaisionally effect the convergence, probably by the set lightly knocking the wall when its pushed back.

    "the edges are most obvious on digital tv (ondigital) and DVD"

    Do you watch region 1 or 2 dvds, I find if I pit a region 1 on with the dvd outputting NTSC then the colour finging appears for about the 1st 20 mins but gradually settles down and disappears, my guess is that the tv does slight reconvergence everytime you change picture formats and between PAL and NTSC,

    "I've had a tosh 56 WHO8B now for about 3 weeks"

    After 2-3 months everything settles down a bit and the tv needs much less tweeking.

    Hope this helps.
     
  4. damjanb

    damjanb
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    > On screen edges often have a greenish or red "outline"
    >
    do you mean often as sometimes, or is it a more regular thing?
    In particular: does it depend on orientation?
    The problem that I haven't solved yet on my set are red outlines
    on the right edge of dark-to-light transitions, and green outlines
    on the left edge of such transitions.
    The outlies are slight enough when the set warms up, but they
    nudge me a foot or two further than necessary.

    I did reduce these outlines by adjusting Y/C delay, but cannot
    make them go away completely.

    One explanation would be scan velocity modulation, which can
    produce color fringing even on black & white sources. On my set,
    turning SVM off is not a service menu option, and i wouldn't like
    to open the set and try disconnecting leads.

    Another possibility, which i intend to look into, is to redo static
    convergence with a convergence grid and only then do dynamic
    (point) convergence.

    Let me know how it goes,
    DamjanB
     
  5. Duncan Harvey

    Duncan Harvey
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    I think you've got it - yes its red and green on edges where there is a contrast between dark and light.

    Didnt really notice it on DVD last night (watching via component) but its there on video playback (DVHS delivered by Svideo).

    How would I adjust y/c delay?

    thanks

    Duncan
     
  6. damjanb

    damjanb
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    Hi Duncan,
    > yes its red and green on edges where there is a contrast
    > between dark and light.
    >
    on my set, this is systemetic:
    red to the right, green to the left,
    and all over the screen.

    You can probably find out how to adjust Y/C delay on
    Toshibas on the Keohi site:
    http://www.keohi.com/keohihdtv/

    How about SVM, did you turn it off?

    > Didnt really notice it on DVD last night
    > (watching via component
    >
    it may well be less pronounced, or eliminated,
    when using component (better timing)

    > but its there on video playback
    > (DVHS delivered by Svideo)
    >
    I use S-video for all sources, and i think it's less
    obvios from DVD, but should really make some
    more systematic observation.
     
  7. Duncan Harvey

    Duncan Harvey
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    Hmm, not sure how to access the SVM and again, am wary about meddling too much.

    Any Toshiba experts out there who can help?
     
  8. damjanb

    damjanb
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  9. Duncan Harvey

    Duncan Harvey
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    Thanks for that - definitely the problem.

    In fact I was dabbling with the picture options on my dvd player - Pioneer 737 and one of the options is YC delay. I increased it to the max and it significantly improved the situation. Hence I imagine tweaking the delay in the tv would solve the problem for other sources.

    Any idea how I do this via the service menu, and what the settings should be?

    thanks

    Duncan
     
  10. damjanb

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    > Thanks for that - definitely the problem.
    >
    > YC delay. I increased it to the max and it
    > significantly improved the situation
    >
    good, glad to hear this!

    I don't know how to adjust the delay on Toshibas, but
    once you find the option, the right setting should be a
    matter of eyeballing the picture, because sets are set
    up so differently.

    I also spent some fruitful hours last night (re)converging,
    and updated the page to reflect what i learned. I think
    this is a common problem, and imagine the info i put
    there might be useful to others:

    http://nl.ijs.si/~damjan/edges.html

    DamjanB
     
  11. johnjackthom

    johnjackthom
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    Just a thought... does this fault disappear as you reduce the colour saturation on the TV down to zero?
    If it remains on the "black and white" picture it must be a convergence problem.

    John
     
  12. Duncan Harvey

    Duncan Harvey
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    Am supposed to be getting a call from a Tosh engineer in the next week or so re this - I phoned up the etailer and they mentioned y/c delay to Tosh and they acknowledged it as a problem.

    Will keep you posted

    Duncan
     
  13. damjanb

    damjanb
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    > does this fault disappear as you reduce the colour
    > saturation on the TV down to zero?
    >
    haven't tried this, but it was there on a B&W source

    > If it remains on the "black and white" picture it must
    > be a convergence problem
    >
    unless it is caused by SVM
    (which i have, and can't turn off)
     
  14. damjanb

    damjanb
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    > getting a call from a Tosh engineer in the next week or so
    >
    > Will keep you posted
    >
    yes please, i'd like to get to the bottom of this

    I checked the Toshiba service items for a US model
    and saw something which may conceivably be Y/C
    delay (something to do with Y1 and subcarrier,
    whatever Y1 is), but you better get this from a
    qualified person
     

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