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Discussion in 'Electronic Repair' started by [email protected], Mar 19, 2007.

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  1. Guest

    I have a Tobisha TV. It is 32 inches. I do not know when it was made
    but I would have to say late 90's, maybe 98-99. It is your standard
    old TV, not one of the new fancy ones that everyone is buying.

    Here is the problem.....

    The image on the television constantly contracts. The sound is
    perfect. When you turn the TV on the picture is fine. After a
    certain amount of time, which is variable and (seemingly) random, the
    picture slowly condenses to the center of the screen. It would seem
    like someone is squeezing the picture from the top and the bottom
    simultaneously. The picture squuezes into a rectangular box in the
    center of the screen, about 6 inches on the side, while the rest of
    the tv remains black. There is no squeezing from the left or the
    right. Sometimes this picture will flutter between 3 inches wide to
    maybe 9 inches wide on the side. Sometimes while in this state the
    picture will spontaneously jump back to the full size and stay there
    for a couple of minutes, only to return inevitably to the condensed

    Upon smacking the top of the TV with my fist the picture returns to
    the full screen every time. If i only lightly smack it it will grow
    larger on the top and the bottom. So smacking fixes the problem

    I would appreciate any and all input anybody has on this matter. I am
    determined to get to the bottom of the issue and would not mind
    attempting to fix the problem on my own. Please let me know if anyone
    can diagnose the problem and reccommend a possible solution.

    Thank you very much,

    Best Regards,

    Andrew Kotheimer
  2. b

    b Guest

    ha escrito:
    FIRST: DON'T keep using the set like this! you will blow the frame
    chip. Open it up, resolder the pins on the frame chip (vertical output
    stage) - you may have to trace it back from the leads on the scan
    coils round the tube neck. usually the horizontal leads are red and
    blue and are often fatter; the vertical may be brown and yellow and

    if you can't solder well , get it to a tech, as it stands this is a
    simple repair but if you nurse it along it will blow parts and turn
    out more expensive.

  3. Charlie East

    Charlie East Guest

    Check for bad solder around the vertical section, Maybe on the chip, You may
    need a magnifier
  4. clifto

    clifto Guest

    You've got me confused:

    So it's squeezing in on all four sides.
    So it's only squeezing in from the top and bottom.
    So it's squeezing in on all four sides.
    So it's only squeezing in from the top and bottom.
    So it's squeezing in on all four sides.

    I'd have to guess it's squeezing in on all four sides, since that was
    the appearance three times and top-and-bottom-only just two times.
  5. Guest

    Get yourself an automatic TV smacker and save on repair bills.
    Just kidding. I couldn't help myself :)
  6. I've encountered quite a few problems with electronic gear in the
    past 50 years -- but NOT ONE of those problems was ever "TANTALIZING"!
    I envy the OP. ;-)
  7. Ken Weitzel

    Ken Weitzel Guest

    Nor have I... but I have run into a few "SHOCKING" problems :)

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