Question about Zenith A27A11D 27" TV

1 Answer

No Red- Intermittent

Wondering if this is worth fixing. TV has a good picture but there is no red, just Blue and Green. Every once in a while the red comes back but then goes out. TV was no dropped. Problem just started and TV is almost 10 years old. Is it worth it to fix?

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  • Litmany Feb 20, 2008

    Just spoke with the repair place and they said the picture tube is bad and would cost more than a new TV to fix. So back to square. Is it worth a second opinion?

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  • Master
  • 6,966 Answers

Hi,

A short answer, YES. I suspect a cold solder on the red drive transistor. That transistor is one of 3 identical components (one for each of the blue & green). They are normally found in a small squarish PCB that is connected to the rearend of the picture tube. In some instances, they are also heatsinked. More often you need to remove the shield/screen protecting the foil side of the PCB. This has to be done gently since it can easily crack the glass holding the pins.

Cold Solders are corrected by applying heat from a soldering iron and probably a dab of solder lead. Solder joints should be shiny (not dull gray) with no air bubbles.

If your concern has not been corrected after completion of the above procedures, you may need to replace the red drive transistor. it might also be worth your while to check for any other component that may suffer from cold solder and/or any loose connection(s).

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 Feb 15, 2008

  • Louie  Role
    Louie Role Feb 15, 2008

    A friendly reminder pls. Extreme care should be exercised since you would be working on components with high voltages. The TV has been known to hold such a charge even when unplug.

    The above procedures calls for a bit of knowledge and familiarity with electronic components and circuitry and of course soldering. Should you not be comfortable doing this, perhaps you need to seek the services of a qualified professional or at least a friend who has done some electronic work/soldering before.

    Cheers.

  • Louie  Role
    Louie Role Feb 22, 2008

    Hi again,



    Your own opinion should be good. Give it a gentle "whack" on the side. If the red comes back (even for just a while), it is a loose connection, if not guess they're right, replace the TV.



    Cheers.

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