Question about Curtis CM19033S 19" TV

4 Answers

Convergence issue on Curtis Mathes CM19033S TV

I was adjusting the focus on my Curtis Mathes TV when my arm bumped the clamp on the convergence magnets on the neck of the CRT Tube and now I can't get the picture's convergence back to the way it used to be. In the top right corner the red is jutting up above anything on the horizontal lines, while in the top left corner the same is for the blue. And along the bottom of the screen in the left corner the red is off on the horizontal lines there, and in the bottom right corner the blue/red is off on the horizontal lines as well and I can't seem to get it converged by using the deflection coil and magnets, is there a way to get it properly 100% converged again?

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  • Cyrus117 Nov 27, 2007

    Couldn't find much at that site to help :/

  • Cyrus117 Nov 27, 2007

    Yea I tried using that guide before, but it didn't help get rid of the problem though

  • Cyrus117 Nov 28, 2007

    I cant get that program to show on my tv

  • Cyrus117 Nov 28, 2007

    Yea that's what I was tryin to do, but so far it seems like I can get the center of the screen aligned, but the edges are always off :/

  • Cyrus117 Nov 29, 2007

    yea lol already shocked myself once by trying to adjust the yoke, but gonna try adjusting it tomorrow again. hopefully i'll get it right; been 2 months since I messed it up x.x

  • Cyrus117 Nov 29, 2007

    Also, just thought I'd ask but if the tv originally had near 100% / 100% convergence, it's possible to get it back that way right?



4 Answers

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Unfortunately you'll need a pattern generator now. If you can do it without you will have really accomplished something that most techs can't do... :)
On big screens we use jigs if their not equipped with their own grids and pattern generators for all the older sets, especially the direct view sets..

Posted on Nov 28, 2007

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Down load and install this software below and use select test pull down menu to select the dot pattern to line up all the dots using a pair of tabs at a time observe on the screen which colors the tabs move align green & red then green & red on blue

you can also use the crosshatch pattern to check it (back and forth) tell you see what
you are doing

Posted on Nov 27, 2007

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  • Eugene Merritt Nov 28, 2007

    Sorry about that I was working on a monitor and got carried away
    the page is so long I nodded Bar generators are expensive and
    you probably dont need one.If you are into computers and have an
    old video card with videio out on it you might try that I wouldn't use
    anything that you care about the program isnt very sensiteve
    they usually paint a reference line on clamp and tab base so if its bumped
    you can reline it

  • Eugene Merritt Nov 28, 2007

    If you cant get that to work you wlil habe to get a
    dot bar generator.or take it to a TV Repair shop

    If you decide you want to get a Dot/Bar gernerator
    Google Electronics test equopment generators NTSC
    dot bar crosshatch etc

  • Eugene Merritt Nov 29, 2007

    you done good Now you know what it looks like when
    it lines up in the center.Sometimes you can do the rest
    with the yoke and wedges pull it back tilt side to side
    up and down etc

    They used to sell vcr tapes with bars,dot, & crosshatch
    you may be able to record the pattern from the computer
    on video tape if you have a VCR record each pattern you
    want to use for as long as you need.

    If you can get a clear enough pattern you might be
    able to get a satifactory picture peace out

  • Eugene Merritt Nov 29, 2007

    PS if you decide to do it yourself be careful that yoke
    can bite a little.

  • Eugene Merritt Nov 29, 2007

    Anything is Possible


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Here's from Sam' Electronic Repair page.

you'll find lots of troubleshooting procedure here!

Posted on Nov 27, 2007

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  • Rommel Balcita Nov 27, 2007

    adjusting them alone may not give you the usual or perfect convergence of your set.

    but its worth trying to adjust them! you gain much experience of messing with the convergence of the set.
    remember also to resolder component of your set. resoldering extends your sets' good operation.

  • Rommel Balcita Nov 27, 2007

    CRT convergence adjustment

    In the good old days when TVs were TVs (and not just a picture tube with
    a little circuit board attached) there were literally drawers full of
    knobs for setting convergence. One could spend hours and still end up
    with a less than satisfactory picture. As the technology progressed,
    the number of electronic adjustments went down drastically so that today
    there are very few if any.

    Unless you want a lot of frustration, I would recommend not messing with
    convergence. You could end up a lot worse. I have no idea what is used
    for convergence on your set but convergence adjustments are never
    quite independent of one another. You could find an adjustment that
    fixes the problem you think you have only to discover some other area
    of the screen is totally screwed. In addition, there are adjustments
    for geometry and purity and maybe others that you may accidentally move
    without even knowing it until you have buttoned up the set.

    Warning: Accurately mark the original positions - sometimes you will change
    something that will not have an obvious effect but will be noticeable
    later on. So it is extremely important to be able to get back to where
    you started. If only red/green vertical lines are offset, then it is
    likely that only a single ring needs to be moved - and by just a hair.
    But, you may accidentally move something else!

    If you really cannot live with it, make sure you mark everything very
    carefully so you can get back to your current state. A service manual is

    Convergence is set using a white crosshatch or dot test pattern. If you
    do not have a test pattern generator, any static scene (from a camcorder
    or previously recorded tape, for example) with a lot of fine detail will
    suffice. Turn the color control all the way down so you have a B/W picture.

    Static convergence sets the beams to be coincident in the exact center of
    the screen. This is done using a set of ring magnets behind the purity
    magnets on the CRT neck.

    From the Sams' for the RCA CTC111C: "adjust the center set of magnets to
    converge blue to green at the center of the screen. Adjust the rear set
    of magnets to converge red to green at the center of the screen." Your
    set may have a slightly different procedure.

    Dynamic convergence adjusts for coincidence at the edges and corners.

    On old tube, hybrid, and early solid state TVs, dynamic convergence was
    accomplished with electronic adjustments of which there may have been
    a dozen or more that were not independent. With modern sets, all convergence
    is done with magnet rings on the neck of the CRT, magnets glued to the CRT,
    and by tilting the deflection yoke. The clamp in conjunction with rubber
    wedges or set screws assures that the yoke remains in position.

    From the Sams' for the RCA CTC111C: "Loosen the screws at the 6 o'clock and
    10 o'clock positions to permit the yoke to be tilted vertically. Rock yoke
    up and down to converge the right and left sides of the screen. Tighten screw
    at 6 o'clock and loosen screw at 3 o'clock to permit the yoke to be tilted
    horizontally. Rock yoke from side to side to converge the top and bottom
    of the screen. Tighten screws at 3 o'clock and 10 o'clock."

    Many sets simply use the main clamp which locks the yoke to the neck of the
    CRT in conjunction with rubber wedges between the yoke and the funnel of
    the CRT to stabilize the yoke position position.

    Refer to your service manual. (Is this beginning to sound repetitious?)

    For additional comments on convergence adjustments, see the sections: "Tony's
    notes on setting convergence on delta gun CRTs" and "Saga and General setup
    for large CRT TVs".

    Tilted picture

    You have just noticed that the picture on your fancy (or cheap) TV
    is not quite horizontal - not aligned with the front bezel. Note that
    often there is some keystoning as well where the top and bottom or left and
    right edges of the picture are not quite parallel - which you may never
    have noticed until now. Since this may not be correctable, adjusting
    tilt may represent a compromise at best between top/bottom or left/right
    alignment of the picture edges. You may never sleep again knowing that
    your TV picture is not perfect! BTW, I can sympathize with your unhappiness.
    Nothing is more annoying than a just noticeable imperfection such as this.
    However, since TVs always overscan, the only time you will really notice a
    minor tilt without going out of your way to look for it is if there is text
    or graphics near the edge of the screen.

    There are several possible causes for a tilted picture:

    1. Set orientation. The horizontal component of the earth's magnetic field
      affects this slgithly. Therefore, if you rotate the TV you may be able
      to correct the tilt. Of course, it will probably want to face the wall!

      Other external magnetic fields can sometimes cause a rotation without any
      other obvious effects - have you changed the TV's location? Did an MRI
      scanner move in next door?

    2. Need for degaussing. Most of the time, magnetization of the CRT will
      result in color problems which will be far more obvious than a slight
      rotation. However, internal or external shields or other metal parts in
      the set could become magnetized resulting a tilt. More extensive treatment
      than provided by the built-in degaussing coil may be needed. Even, the
      normal manual degaussing procedure may not be enough to get close enough
      to all the affected parts.

    3. You just became aware of it but nothing has changed. Don't dismiss this
      offhand. It is amazing how much we ignore unless it is brought to our
      attention. Are you a perfectionist?

    4. There is an external tilt control which may be misadjusted. Newer Sony
      monitors have this (don't know about TVs) - a most wonderful addition.
      Too bad about the stabilizing wires on Trinitron CRTs. A digital control
      may have lost its memory accidentally. The circuitry could have a problem.

    5. There is an internal tilt control that is misadjusted or not functioning.
      The existance of such a control is becoming more common.

    6. The deflection yoke on the CRT has gotten rotated or was not oriented
      correctly at the time of the set's manufacture. Sometimes, the entire yoke
      is glued in place in addition to being clamped adding another complication.

      If the TV was recently bumped or handled roughly, the yoke may have been
      knocked out of position. But in most cases, the amount of abuse required
      to do this with the yoke firmly clamped and/or glued would have totally
      destroyed the set in the process.

      There is a risk (in addition to the risk of frying yourself on the various
      voltages present inside an operating TV) of messing up the convergence
      or purity when fiddling with the yoke or anything around it since the yoke
      position on the neck of the tube and its tilt may affect purity and
      convergence. Tape any rubber wedges under the yoke securely in place
      as these will maintain the proper position and tilt of the yoke while you
      are messing with it. (Don't assume the existing tape will hold - the
      adhesive is probably dry and brittle).

    7. The CRT may have rotated slightly with respect to the front bezel.
      Irrespective of the cause of the tilt, sometimes it is possible to
      loosen the 4 (typical) CRT mounting screws and correct the tilt by
      slightly rotating the CRT. This may be easier than rotating the yoke.
      Just make sure to take proper safety precautions when reaching inside!

  • Rommel Balcita Nov 28, 2007

    a still picture with text when adjusting if you don't have the pattern

  • Rommel Balcita Nov 28, 2007

    Carefully analyze the steps and it will give you optimal convergence on your display

  • Rommel Balcita Nov 28, 2007

    just read the convergence adjustment procedure i posted and use it together with the monitor test! the monitor test will not automatically adjust your tv's convergence! you must adjust the color rings and focus while the monitor test is on! one by one you adjust those rings! if there is a possible marking of its original position then they should be in place first. then slowly and carefully adjust one by one!remember to loosen first those rings(not too loose) or you will be only tweaking the whole yoke.

  • Rommel Balcita Nov 28, 2007

    READ !!!!

    CRT purity adjustment

    Purity on modern CRTs is usually set by a combination of a set of ring
    magnets just behind the deflection yoke on the neck of the CRT and the
    position of the yoke fore-aft. As always, mark the starting position of
    all the rings and make sure you are adjusting the correct set if rings!

    Use the following purity adjustment procedure as a general guide only.
    Depending on the particular model TV, the following purity adjustment
    procedure may substitute green for red depending on the arrangement of the
    guns in the CRT. This description is based on the Sams' Photofact for the RCA
    CTC111C chassis which uses a slot-mask CRT. The procedures for dot-mask
    and Trinitron (aperture grille) CRTs will vary slightly. See you service

    Obtain a white raster (sometimes there is a test point that can be grounded
    to force this). Then, turn down the bias controls for blue and green so
    that you have a pure red raster. Let the set warm up for a minimum of
    15 minutes.

    Loosen the deflection yoke clamp and move the yoke as far back as it will go,

    Adjust the purity magnets to center the red vertical raster on the screen.

    Move the yoke forward until you have the best overall red purity.

    Now, move the yoke forward until you have the best overall red purity.
    Tighten the clamp securely and reinstall the rubber wedges (if you set
    has these) to stabilize the yoke position. Reset the video adjustments
    you touched to get a red raster.


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Try this will help u when my tv shows the problem i refer to this site only

Posted on Nov 26, 2007

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Projection TV2_bing.gif sets need to have all three colors - RED - BLUE - GREEN - lined up correctly on the screen in order for the video to look normal. When its out of alignment the video will look 3D, wavy, distorted, etc. Most of the time you just need to adjust your convergence in the TV menu. If you cannot adjust it in the menu - then your convergence is broken and needs to be repaired.

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Here is a quick test....

Using your original remote go-to the settings menu then goto the convergence section.

Try to adjust the red and then the blue convergence.

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You will need to replace the convergence chips and possibly some convergence resistors and pico fuses.
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