Question about Projection Televisions

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Toshiba TV Model 32JW9UA. The Red component of the 3 primary colours has just started to disappear for extended periods, intermittently. If I set the Colour slider and the Tint slider on the TV menu to zero the picture grey tones look okay and the picture is clear. However, the on-screen menu colours are missing the Red component. This situation is consistant whether using composite, component or normal antenna input. All the external cable connections appear good and tight.

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  • toonstjc Sep 25, 2008

    Thanks for the suggestion, but this TV does not have a convergence adjustmenton the user menu as far as I can see. Or do you mean the Geomagnetic adjustment? If so this only adjusts the alighment of the picture. Or do you mean the Service menu?

  • toonstjc Sep 25, 2008

    Thank you to welcome jee. How would I identify the "Colour Processor" area?

  • toonstjc Sep 27, 2008

    I have spent a couple of hours checking the soldering of the color proccessing board and other areas plus plug connections and these appear sound. Also have turned the set on and tapped all the components on the PC boards while watching a test pattern on the screen for any change, to no effect. Any other suggestions? This is a CRT wide screen 32" TV.

  • toonstjc Sep 27, 2008

    Thank you all for the suggestions, but I believe toddg may have hit the nail on the head as the color problem is getting worse not just on the Red. Will contact EMPR Australia on Monday and get it sorted. Thank you toddg!

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  • Master
  • 6,966 Answers

Hi,

If I may add...

Have you tried looking over the CRT driver board? that would be the squarish PCB right at the very end of the CRT. In some models, there would be 3 heatsinked transistors responsible for each color or in some versions a single power pack IC. Often one of the transistor gets a cold solder or simply needs replacement.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards. Thank you for using FixYa.

Posted on Sep 27, 2008

  • Louie  Role
    Louie Role Sep 27, 2008

    Hi again,
    Below would generally how it would look like connected to the rear of the CRT

    it would look something like this if it uses an IC power pack

    and something like this if it uses individual transistors.



  • Louie  Role
    Louie Role Sep 27, 2008

    Forgot to mention that the board is often encased in a shielding of some sort that has to be removed to gain access to the foil/solder side of the board. There would also be numerous grounding straps.

    I am of course assuming that you are familiar with working on high voltage circuitry (G2/Screen) and FBT/EHT HV and safe practices/procedures.


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  • 171 Answers

Listen, this is a CRT television and in Australia it is getting some negative reviews. The RGB cone is what is going bad. If you contact EMPR in Australia, they can diagnose and repair the unit relatively inexpensively for you.

Posted on Sep 25, 2008

  • Todd Gale
    Todd Gale Sep 25, 2008

    If you are located elsewhere, please tell me where and I will give you the contact information for that country and location. This is not something you can fix your self as is not as simple as an IC or a bad solder. You will damage them unit unreparably for a $25.00 part.

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  • Master
  • 10,594 Answers

This symptoms shows dry joints or bad solder joints in color processing area.
If you know good solder work, you can do it yourself. Just look for lose connections / solder joints at main board and sub boards OR call TV Tech person to fix it.

Posted on Sep 25, 2008

  • Shahid Electronics
    Shahid Electronics Sep 25, 2008

    2 pictures are here. One is showing schematic and 2nd is printed circuit board, you might have an idea how it would look like.







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Have you tried to manually adjust the convergance?. go into your set up menu there you will find the convergance adjust ment. please rate this..thanks

Posted on Sep 25, 2008

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