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Sony KV27V10 Convergence

Discussion in 'Electronic Repair' started by Dave M., Jul 5, 2006.

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  1. Dave M.

    Dave M. Guest

    When this set was purchased, it looked as if all the Sony 27" sets had poor
    convergence in the upper right area of the crt image. I called the service
    center about this and they warned me that I would be charged for the trip
    to my home if the convergence looked "normal". Therefore, I let it go.

    Today, I'm wondering if anyone knows if there is a procedure to remedy the
    upper right convergence problem as we normally converge the center of the


    Dave M.
  2. kip

    kip Guest

    Use little magnets on the rear of the CRT to correct the convergence.
  3. Art

    Art Guest

    Suggest geting the service manuel and doing some in-depth studying of that
    material before attempting, not a DIY project, IMHO.
  4. Dave M.

    Dave M. Guest

    That is true. However, I'm looking for the solution for a problem that is
    probably not addressed in the manual.

    It looks as if I can't ask any questions without being labled an amature.
    I used to service TV's for a living.
  5. Tech Data

    Tech Data Guest

    Ok, saw this last night and wondered, since it's over 10yrs old, has it
    gotten worse or is it the same and you finally want to resolve it. I
    see two options: 1. Purchase some chevron magnets and tack them on the
    bell of the tube where the problem is. Might help, might not. Or, 2.
    You have a bad crt. I've pasted a repair log from a major retailer's
    service center on that series with that problem:

    Sony KV27V22 AA-2 CONVERGENCE KV27V22 serial # 8051260 will not
    converge the bottom red green or blue horizontal lines Unit has over 6
    permaloy magnetic on the CRT bell in the area of the bottom of the
    yoke. This is not a good sign. It is also a rebuilt CRT. We are not
    going to place more Permaloy strips on this CRT. It needs replacement.

    Sony KV27V40 BA4 CONVERGENCE KV27V40 Unit has vertically skewed
    convergence. Center vertical convergence is Skewed with red skewed
    counter clockwise by 0.5 inches and blue skewed clockwise by nearly the
    ..05 inched. Green lines are straight. Problem is caused by a defective
  6. The way you posed the question indicated that you probably don't have much
    experience with CRT convergence and purity. Even most "TV techs" should be
    careful to start fiddling with it without getting any documentation
    available form the manufacturer. Anyone who has the experience to likely
    improve convergence on part of a CRT without making it worse or ending up
    with an different problem would know that each one is a little different,
    and that it is often best to leave it alone if you aren't willing to do the
    homework first. No easy solutions to this type of problem...

  7. Dave M.

    Dave M. Guest

    I have converged hundereds of crt's I don't know what you are talking
    about. There is obviously a communications problem. This set has
    convergence off in the upper right portin of the screen on ALL of this
    model that I have seen in the stores. I am fully aware that convergence
    cannot be perfect over the entire screen area. I am looking for someone who
    has attempted to correct the convergence in the region of the screen that I
    mentioned. Is that so difficult to understand?

    Dave M.
  8. If you have converged so many crts, you should know that the adjustment of
    corner convergence is usually accomplished by adding magnets to the crt, and
    that it is very difficult to efect much change without interacting with
    geometry and purity. You should also know that one should always start with
    the manufacturer's procedures and verify whether there are any service
    bulletins related to the matter. So, as was suggested earlier, get the
    documentation, follow Sony's procedure for alignment, get some magnets, and
    see what you can get out of it. If you have the experience you should be
    able to at least get it back to where it is now and not screw it up. With
    such experience, you know, however, that convergence in one corner is very
    difficult to correct in a CRT. There are no magic bullets. There are no
    Sony service bulletins on the matter for this set, so follow the service
    manual as a guide.

  9. Max

    Max Guest

    most of problem with convergence in sony tv is convergence coil.
  10. kip

    kip Guest

    most of problem with convergence in sony tv is convergence coil

    And pray tell what is the convergence coil in this Model ?

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