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What's DVCO?

Discussion in 'Home Cinema Buying & Building' started by NicolasB, Mar 30, 2005.

  1. NicolasB

    NicolasB
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    It's an item in the service menu of my TV, but I'm not quite sure what it does.
     
  2. Gary Lightfoot

    Gary Lightfoot
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    Digital Video Cut Off?? :)

    Something to do with digital levels from a digital source maybe? What's the range or adjustments it allows?

    Gary
     
  3. NicolasB

    NicolasB
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    There's a separate thing in the menu called "cut-off", though. :)

    DVCO seems to have a default value of "000", and can go either positive or negative. You can't set the value directly, though - if you press the adjust button it thinks about it for a bit and then chooses its own value. The value it locks onto seems to vary quite a lot from source to source, and even from channel to channel via Sky. Sky+ usually comes out as -002, but sometimes as +006. Arcam DV27A usually comes out as -012.

    Presumably one is supposed to feed some sort of specific test signal into the TV to set it, I don't know....
     
  4. Gary Lightfoot

    Gary Lightfoot
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    i've no idea then - it was just a guess anyway. :)

    Gary.
     
  5. Mr.D

    Mr.D
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    You feed it a colour bar pattern hit adjust and wait for it to stabilise.
    This is from a 4 year old post on a newsgroup from a guy called plisken who I won't credit as he was actually me!

    I'm assuming you have a panasonic TV?


    DVCO (take a guess at deflection voltage cut-off/correction??) : leave it
    alone you need a PAL colour bar for it to auto adjust to. (more info to
    follow ) *UPDATED* service manual: Recieve a PAL colourbar pattern. FOR DVCO
    alignment press blue button wait until the colours are changing slowly and
    press "STR"

    (in practice the" colour changing slowly bit means that the numbers have
    stabilised it takes about 10 secs. The value it satbilises to can vary
    depending on the input and the source material ie I get slightly different
    values using the PAL colourbar on that free total dvd disc than I do with
    the Video Essentials one. Personaly I trust the VE one as its full bandwidth
    the total dvd disc looks like its come off a composite source. I use this to
    cal the dvd player via RGB. For my digibox as I've yet to find a transmitted
    colour bar the discovery kids and wings ident works well: all you need is
    something that contains the full gammet of displayable colour values and
    this comes close.

    Panasonic advised me to do this to correct some (very minor)flickering in
    peak white areas via RGB It didn't really correct this fully and I suspect
    this procedure fixes a flickering black line problem instead. It is a fairly
    harmless procedure if you stick to the recommendations though so give it a
    go. I suspect it controls the deflection interval between two scanlines for
    a given field hence the black line problem when its incorrect: could be
    wrong though)
     
  6. NicolasB

    NicolasB
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    Mr D,

    Rather belated thanks to you as I had given this thread up as a lost cause and stopped checking it for updates! :blush:

    I do indeed have a Panasonic TV. I think it's starting to feel its age a little bit. In particular, it occasionally starts to show an odd sort of picture noise where you have horizontal lines of slightly-wrong-brightness scrolling rapidly either up or down the screen. I discovered (more or less by accident) that tweaking the DVCO setting seems to stop it from doing this, although (infuriatingly) it requires different DVCO settings depending on whether I'm watching Sky or a DVD. :mad:
     

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