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JVC 28p37 Geometry/Overscan Q

Discussion in 'Televisions' started by Barzo, Aug 16, 2004.

  1. Barzo

    Barzo
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    Now it may just be, but it seems that the vertical overscan on my new set seems wrong - info missing at the bottom of the picture. I noticed this when viewing a DVD on my laptop screen as opposed to my new TV. Not really bad (or at least I think not, although I will run some test patterns in DVD Essentials to confirm), but noticeable. Anyone else had this problem, or is it likely to be TV specific? Also, if it is an overscan problem, can it be fixed by an engineer/someone qualified to fiddle with the service menus?
     
  2. hornydragon

    hornydragon
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    i have nevr seen a Tube TV or plasma shipped from factory without overscan! try the various Zoom modes first but a 1.77:1 test grid will normally show 5% overscan vertically and 2-3% horizontally! Picture is also likely to be skewed and shifted either right or left.
     
  3. GaryB

    GaryB
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    Most TVs are overscanned slightly to compensate for various things. Among them:

    Mains variations.
    To avoid seeing VCR head switching points at the bottom of the picture.
    To avoid seeing Teletext data and test lines at the top of the picture.
    Complaints of "picture to small"

    Also, since most broadcasters now use 14:9 as their default ratio, it goes some way to filling up the frame.

    It's simple on the P37 to tweak this.
     
  4. Barzo

    Barzo
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    GaryB,

    Many thanks for your help. How does one tweak this on the p37?

    In all respects, I think this is an excellent TV (given that I watch more DVDs than TV), and a steal at the price I paid - £499.99 from Allders, with a 5 year guarantee.
     
  5. GaryB

    GaryB
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    Press "i" and Audio Mute to get to the Service Menu.

    Selection Option 4 - Deflection.

    The first item in the Deflection Menu is "Free Run". Don't panic if the picture rolls when it is selected - this is normal.

    Use the Up & Down buttons on the Remote to change the items. The two you need are:
    Item 2 - V Shift
    Item 3 - V Size
    Use the Left & Right buttons to change the value.

    When you get it right, press MENU to store the new settings.
    If you get it wrong, press "i" to exit without saving.

    Adjust in 900i first as this will affect the other screen modes.

    I suggest you try it a few times and hit "i" to exit without saving until you are confident that you know what you are doing.

    *Obligatory Disclaimer* Be very careful. There are over 200 adjustments in there. Some will turn your TV into an expensive ornament if done incorrectly.
     
  6. Barzo

    Barzo
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    Many thanks - will have a go later in the week!
     

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