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Removing Scratches from CRTs

Discussion in 'Electronic Repair' started by Chris F., May 14, 2005.

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  1. Chris F.

    Chris F. Guest

    A friend brought me a load of old TVs and stuff he'd rounded up from city
    trash day, and amongst them was a set I hadn't heard of a before - a Loewe
    Calida. I thought it was an old studio monitor or something, but looking
    around on the internet I see it is actually a premium - and pricey -
    television set. Trouble is, it has a big ugly scratch along the top - very
    shallow but still enough to hurt the image. Is there any way to remove, or
    at least hide/mask, scratches on CRT faces? I have a number of nice sets in
    my stock that have minor scratches and chips on the faces - nothing large,
    just enough to reduce the sets value to the point where it isn't worth
    The Loewe is actually dead, I just wanted to see if I could repair the CRT
    before trying to get the set going. Not a chance of replacing it - it's some
    weird Philips "Black Matrix" which would be impossible to obtain.
    Thanks for any advice.
  2. cnctut

    cnctut Guest


    Only a guess--how about an auto window repair kit--they do pretty well
    on stone and pebble damage to windshields.

  3. Art

    Art Guest

    One method many resort to is to actually polish the scratch out of the face
    of the crt, if it is not too deep. However it may distort the display. Will
    take a considerable period of time and require delicate polishing
  4. NSM

    NSM Guest

    I've used those. I suspect a version might work best.
  5. And, if there is an antireflective or textured coating, will probably
    make it look much worse.

    No one has mentioned the safety issues. How deep are the scratches?
    If they are really bad or extend over a large area, there may be increased
    risk of implosion.

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  6. NSM

    NSM Guest

    "I suspect a vacuum version might work best".
  7. Chris F.

    Chris F. Guest

    The scratch on the Loewe is very shallow, not even deep enough to catch a
    fingernail. Not a safety hazard considering that most CRT glass is about
    1/2" thick at the face.
    After some fiddling around last night, I realized that the Loewe was
    actually a European set designed for 220V operation. So I hooked it up to
    some 220, and it powered up just fine. Unfortunately, it's a PAL set with
    some very strange connectors, so I'm going to need some conversion equipment
    before I can tell if it works right. The image quality of the onscreen menu
    is outstanding - obviously a very high end set. Even uses a 100Hz scanning
    rate. I suspect I could get quite a bit of money out of this, if I could
    confirm that it works properly.
  8. mydigcam

    mydigcam Guest

    Might try putting a bit of traditional toothpaste on a soft clean cotton
    cloth and rub over the scratch. If this has no effect, then that's about all
    you can do other than replace the CRT or live with it.
  9. none

    none Guest

    They make all types of buffing compounds for glass and plastic.
    The question is, is the scratch deep? If so even if you buff down to
    smooth glass you'll get distortion at the buff area.
    They also make a filler for windshield repair that might work.
  10. PaPaPeng

    PaPaPeng Guest

    As per recommendations from others try buffing with toothpaste or a
    metal polish like Brasso to get rid of as much of the visible scratch
    as possible. Then use an acrylic floor polish sold as Future Wax (or
    Future something, WalMart) to touch up the scratch . The acrylic will
    modify the optical properties, much like damping it with water will
    make the scratch invisible.
  11. NSM

    NSM Guest

    There's a scratch repair kit for eyeglasses that might work better.
  12. kip

    kip Guest

    Dont use Brasso ...You will make it worse.
  13. none

    none Guest

  14. Guest

    What is the model of this Philips tube? If it happens to be made in
    France or Germany, and if the letters ESF are in the model number, it
    may not last very long anyway, depending on how much use it already
    had. These tubes are well known for various short circuits developping
    in the gun assembly...
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