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sony triniton 28" tv fell off

Discussion in 'Electronic Repair' started by Sunitha Kode, Oct 2, 2005.

  1. Sunitha  Kode

    Sunitha Kode Guest

    My 28" Sony Trinitron TV fell off to its face from about a feet's
    height. It first landed on the top left edge of the case & subsequently
    fell to its face.

    Now, when I switch on the TV gives a flash once & then shows nothing. I
    can see the channel number, AV1, AV2 etc. on the top left but in red
    colour (it used to be shown in green). I can see the progress bar for
    volume when I change the volume. But I can't see the picture. Audio is
    perfect.

    I think the picture tube is gone but I want to be sure about it. Is
    there any way to confirm this myself without the help of a technician?

    I opened the TV to see if there are any cracks on the CRT but there are
    none.

    Any information in this regards os much appreciated.

    Thanks in advance.
     
  2. b

    b Guest

    Sunitha Kode ha escrito:
    sounds like you are at least getting a picture, but no video signal.
    I'd say a board has got cracked. With the set on and the back off,try
    poking the boards with a wooden rod or cooking utensil to see if you
    can get a video signal back on screen and then locate the cracks.
    in any case, from the discolouration you mentioned , I'd say the tube
    is damaged. This is probably not feasible to repair.
    good luck, B.
     
  3. Jerry G.

    Jerry G. Guest

    It is possible that the tube is damaged from the drop. There is a
    chance that the circuit board may be damaged.

    If you are not trained in TV service, you should have a TV service
    center look at it, and give you an estimate.

    Jerry Greenberg
     
  4. James Sweet

    James Sweet Guest

    You've probably cracked a circuit board, that part is usually pretty easy to
    fix. The part that concerns me though is the menu being red instead of
    green, that could indicate that the aperature grill inside the tube has
    shifted, in which case you'll never be able to get the purity right and
    it'll always have off-colored blobs but it's hard to know without fixing the
    board, could be just fine.
     
  5. Graham

    Graham Guest


    I think you have two problems with this set.
    The no picture fault might have been worth repairing,

    But the colour purity problem you see on the on-screen graphics is almost
    certainly caused by the trauma the set suffered buckling the aperture grille
    inside the CRT.

    The construction of the Trinitron aperture grille is lighter and more easily
    damaged than other types of CRT.

    --
    Graham.



    %Profound_observation%
     
  6. A simillar drop onto the bottom right hand corner should fix it ;O)

    Seriously it is worth a try before binning the tube.

    I remember the days when a firm thump to the side of the set would
    cure 99% of television faults :O)
     
  7. Dave D

    Dave D Guest

    The other posters are most likely right IMO- the aperture grille in the CRT
    is damaged/shifted. I managed to restore a rather badly damaged (dropped)
    Trinitron by a lot of fiddling with the yoke rings and placing magnets on
    the CRT, but I guess I was lucky, and had too much time on my hands ;-). You
    may find a few degauss cycles lessens the symptoms, but it isn't very
    likely. Also it's worth considering that the integrity of the CRT may have
    been compromised. It may not be visible, but there may be weaknesses in the
    glass which could prove dangerous. You don't say what kind of surface it
    fell on, but if it was concrete, I'd be wary.

    Dave
     
  8. Can you say "Implode!"
     
  9. James Sweet

    James Sweet Guest


    That really shouldn't be much concern, modern TV's are designed so that an
    implosion that sprays anything beyond the enclosure is very unlikely, now
    with the back off it's a whole different story but the face of a CRT is made
    of very thick glass and the shadow mask helps shield any internals.
     
  10. What color is the volume bar? What color is the volume bar supposed to be?
    Is the color of the volume bar and the channel numbers consistant? (not
    changing shades of red or green) Are the red channel numbers possilby from
    the tv not recieving any signal on those channels because of a broken
    circuit board?

    Try using a composite input and see what happens on AV1 and AV2.

    - Mike
     
  11. Ken Weitzel

    Ken Weitzel Guest

    Hi...

    I'd surely want to see some video on it before giving up on the tube.

    It's even possible that it fell at turn on, failed while de-gaussing.

    I once turned on a set at about the same instant that hydro failed.
    What a kalaedascopic (sp?) mess!!! :)

    Ken
     
  12. Sunitha  Kode

    Sunitha Kode Guest

    What color is the volume bar? What color is the volume bar supposed to be?
    Volume bar is green as it is supposed to be. The mute sign etc. are
    also displayed in green.
    The channel numbers were half green & red initially & now it is fully
    red.
    Donno what you mean by this. I tried playing a DVD, there is no picture
    on the screen but audio is fine.

    -Sunitha.
     
  13. Sunitha  Kode

    Sunitha Kode Guest

    With the set on and the back off,try poking the boards with a wooden

    When I tried tapping the circuit board behind the CRT filament,
    there were color stripes which went on & off here & there.

    Also noticed that the CRT filament is not glowing.

    -Sunitha
     
  14. Sunitha  Kode

    Sunitha Kode Guest

    With the set on and the back off,try poking the boards with a wooden rod or

    I tried poking on the circuit board behind the CRT filament & saw some
    colour stripes come & go here & there on the screen.

    Other thing that I noticed is the CRT filament isn't glowing.

    -Sunitha
     
  15. Dave D

    Dave D Guest

    The aperture grille on a Trinitron would be next to no protection from
    flying glass, especially if the screen area collapses. However, I agree it
    is not particularly likely the screen area would fail. I've certainly never
    seen it happen. It is worth pointing it out to the OP as a risk though. Any
    TV landing on its face, certainly onto a hard floor, should be treated with
    caution.

    Dave
     
  16. Composite would be a connection with RCA cables.. example: a dvd player with
    yellow video and red and white audio wires, not through the antenna port
    anything you use on AV1 or AV2.

    Sounds to me like possible screen mask damage and circuit board damage. I'd
    fix the board before making any decisions about the CRT tube.

    - Mike
     
  17. By the way, if you are getting channel numbers and volume bars on the screen
    that means the CRT tube is working, but something must be wrong with the
    electronics. The discoloration may indicate damage to the CRT but never the
    less you should be able to get some sort of picture when the circuit that is
    damaged is fixed.

    - Mike
     
  18. Asimov

    Asimov Guest

    "Ken Weitzel" bravely wrote to "All" (03 Oct 05 04:18:25)
    --- on the heady topic of "Re: sony triniton 28" tv fell off"

    KW> From: Ken Weitzel <>
    KW> Xref: core-easynews sci.electronics.repair:343960

    KW> Hi...

    KW> I'd surely want to see some video on it before giving up on the tube.

    KW> It's even possible that it fell at turn on, failed while de-gaussing.

    KW> I once turned on a set at about the same instant that hydro failed.
    KW> What a kalaedascopic (sp?) mess!!! :)


    Ken,

    I agree with you that there may be nothing wrong with the crt. The red
    colour channel numbers might be the cpu indicating a problem and as
    such is a normal display. In that case the circuitry has been damaged.

    A*s*i*m*o*v

    .... I ran Doublespace on my monitor & get 2 more TV channels.
     
  19. Guest

    The red colour channel numbers might be the cpu indicating a problem

    I concur.

    Also, there is a difference between red/used to be green and red/used
    to be pale green. The channel numbers may always have had some red in
    them, you just never noticed it under the green.

    I've fixed a lot of dropped tv's and monitors by resoldering
    connections that popped loose. Make sure you check all of the solder
    connections, esp. the ones on the tube socket and in places where
    boards come together.
     
  20. The CRT may be gone, for sure. Usually with a set of this size
    following the board cracks around the FBT also. You never know...if
    you do get it going, a degauss may take care of the possible CRT
    problem.

    Tom
     
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