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Sony 30-inch 16:9 CRT Took a Drop - Now have Blotches

Discussion in 'Electronic Repair' started by K4GPB, Feb 23, 2007.

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  1. K4GPB

    K4GPB Guest

    A couple people were moving my 154-lb Sony 30-inch 16:9 CRT to
    another residence and it got dropped a couple feet, hitting the guy's
    foot to "cushion" one side of it. It fell on the heavy front side of
    course. Minor cabinet scratches. It powers on, receives OTA stuff
    very well! No broken glass!!!

    Problem: palm-size green blotch in upper left corner with a matching
    red blotch in the upper-right corner. My handy little degausser coil
    cannot make the blotches go away. Picture otherwise is very crisp and
    clear. Audio is fine. Hope aperture grill is OK.

    Any hints on what to physically look for once I get the back cover
    off? Of course, it's just out of warranty.

    Degauss coil unplugged is my hunch...I just don't know what it looks
    like, or something else with some heavy mass that could have shifted
    when the set got dropped face-first.

    Thanks,
    Gary
     
  2. Guest

    Assuming the yoke did not move, which it probably didn't: The
    aperature grill is damaged.

    You might be able to use crt magnets to get a watchable but not very
    good convergence or geometry in the corners picture.

    Warranty would not apply in any case as it was not a manufactures
    defect but physical abuse damage.
     
  3. The yoke may have moved, but the degaussing coil did not come unplugged.
    You most likely have damaged the aperture grill hangers.

    Leonard
     
  4. Sorry to tell you... It's toast! You will have to live with it.
    The aperture grill (which is inside the CRT) has shifted or bent.
    There is no way to perfectly repair this.
    As another person mentioned, small magnets taped to some spots on the
    back of the CRT might help, but the CRT is irreperably damaged.

    So how's your friend's foot after it "cushioned" the set?
     
  5. K4GPB

    K4GPB Guest

    Ugh. Picture on that TV was really great the first 1.5 years of its
    life.

    Maybe I will round up some really strong (from old hard drives?)
    magnets and borrow wife's hot glue gun.

    His foot is black and blue, but not broken.

    Thanks guys.

    Gary
     
  6. Leave it be for 2 or 3 weeks (use it normally) and see if it fixes itself.

    If it ain't REALLY broke . . . . fixing it may make it worse.


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  7. Sjouke Burry

    Sjouke Burry Guest

    Dislodged shadow mask, probably the tube has been
    permanently damaged.
    If so, you might try to (gently) hit the tube, in
    the hope that the mask might pop back into place.
    (small chanche.)
     
  8. bz

    bz Guest

    Your homeowners insurance may cover the damages (to his foot AND the TV).




    --
    bz 73 de N5BZ k

    please pardon my infinite ignorance, the set-of-things-I-do-not-know is an
    infinite set.

    remove ch100-5 to avoid spam trap
     
  9. ray13

    ray13 Guest

    Er I beg to differ: I have seen this before there is only one fix.
    In my 15 years with Sears service I have fixed many a Sony TV.

    With the biggest rubber mallet I could could find, I smacked the
    screen and only the screen. The aperture in Sony CRT's is made of fine
    wires like a harp. I got the CRT that I had back in shape. The wire
    used as an aperture does have memory. If you are lucky like I was the
    aperture will remember where it was before it was dropped.
    Sony CRT's have like 4 inch thick screens, shine a laser pointer on
    the screen if you don't believe it. The pointer will reflect off the
    phospher 4 inches below the surface.
    So if you think implosion is possible don't do it. I guess I've been
    lucky and never seen a CRT implode.

    73

    N8ZU
     
  10. ray13

    ray13 Guest

    When Sony Engineer told us in a training class that you DONT ever ever
    try to degause a Sony CRT, I asked him why?

    It seems the aperture being made of very fine wires is pre magnetized
    at the factory.

    Any attempt to degause the screen could demagnetized the aperture
    wire.

    73

    N8ZU
     
  11. K4GPB

    K4GPB Guest

    Very interesting mallet idea! Many thanks again.


    The tricks with the spinning magnets on a drill bit are mentioned over
    here: http://www.madville.com/link.php?id=123683&t=23, but they don't
    apply to this great fine-pitch CRT, probably one of Sony's best ever
    CRTs. It's a lengthy thread but with a few chuckles.

    Gary
     
  12. "Don't ever" is not what I have been told by Sony. This would not make
    sense anyway. Sony sets typically have the most powerful degausing coils of
    CRT sets. What we were told is to only manually demagnetize the CRTs when
    you have to, and preferably use a smaller coil. After hearing this myth
    repeatedly I have questioned several Sony tech reps over the years on the
    matter ad they say the same thing. They tend to emphasize caution because
    there are so many idiots out there who don't pay attention and understand
    the nature of what they are doing. I have degaussed many that would not
    clear up with the sets coils working properly. There is often no other way
    to do it but manually. The rule is do just enough to clear the magnetic
    effects to get purity.

    This "don't ever" nonsense is as foolish as saying to never use any supplier
    other than Sony for parts. A grain of truth taken to an extreme by not
    understanding fully what is going on.

    Leonard
     
  13. James Sweet

    James Sweet Guest


    No, if you do that it will most certainly be damaged beyond repair. You
    want weak magnets, like the sort of rubbery refrigerator magnets that
    come in the mail with advertisements on them. Likely it will never be
    perfect again though.
     
  14. James Sweet

    James Sweet Guest


    4 inch? Try more like 1 inch. I dissected a 27" Sony tube a few years
    ago that had been dropped, it was already cracked and up to air when I
    found it.
     
  15. K4GPB

    K4GPB Guest

    Well, tomorrow I'll take a look at the glass thickness with the light
    from my laser level gadget and then try the mallet on the Sony
    KD-30XS955 CRT face and see what happens. The TV is across town and
    has been in the back of a minivan all week since the "drop test" and
    darn, nobody stole it! ;-)

    --Gary
     
  16. K4GPB

    K4GPB Guest

    Laser beam showed phosphors about 1 inch behind front of CRT. Did
    about 10 min of beating with 16 oz. mallet. No change in symptom
    except a lot of vertical shimmering while the beatings took place.
    It's toast.
    Next, I may remove cover and look for any purity(?) magnets that may
    have been dislodged, just in case they used any in the factory.

    --Gary
     
  17. James Sweet

    James Sweet Guest


    You might have some luck adjusting the yoke, it's unlikely but you never
    know.
     
  18. Ray

    Ray Guest

    Turn the set upside down, and drop it again from the same height as the
    first drop.
     
  19. K4GPB

    K4GPB Guest

  20. spam

    spam Guest

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