Question about Sony KP-57WS500 57" Rear Projection Television

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Sony 57inch rear projection TV..turn on, color is fine. After about 1 minute picture begins to fade out in a light bluish color until picture is barely visible. Turn off, turn on picture is great until it starts all over again. leboo43

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  • rwlind Jun 01, 2009

    sometimes it will fade to light blue in one minute, sometimes five minutes. When it fades to blue their will be a darker blue half-moon at top and bottom of screen.

  • rwlind Jun 01, 2009

    no new solution offered. same e-mail sent twice.

  • rwlind Jun 01, 2009

    I appreciate the help. thanks for the information.

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2 Answers

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  • Master
  • 8,619 Answers

Hi

From the information you have provided the problem is with the convergence. The convergence ICs have failed and will need to be replaced along with a few defective resistors. If all the colors are incorrect an open fuse in the voltage supply to the amplifiers is possible. Sony has Pico-fuses. These will resemble resistors but are likely orange or green, with no color stripes. A TV repair company will normally charge about $300-$350 for this repair if the ICs are the problem, less for the fuses. Convergence failure is a very common problem with this TV set. There could be other parts that are not within factory specs. If after replacing you still face the issue then it’s the color wheel that needs to be replaced. The only way to be positive of the problem is to have the circuitry diagnosed by someone with the proper TV test equipment to determine what parts that are no longer within specs. A small TV repair shop will many times be less expensive than a large repair facility.

Please do accept the solution and revert for further assistance.

Thanks
Rylee




Posted on Jun 01, 2009

  • Rylee Smith
    Rylee Smith Jun 01, 2009

    Hi



    Have you already checked the convergence ICs? These TVs work by using electromagnets to focus a beam of electrons on the inside of the screen. The electrons make the screen glow when they hit it. This can cause a magnetic charge to build up on the screen, and that causes things like colors being misaligned. (You probably already know that TV color is a combination of a red image, a blue image and a green image. If they don't line up exactly, you get the effect you see on your TV.) It could also happen due to the coolant spill over the circuit board. If you have already checked everything then it’s the color wheel that needs to be replaced. A TV repairman can do it in a couple of minutes. It would be way cheaper to take your TV to a repair shop, but a 57-incher probably weighs a lot, so you might want to call someone to come n fix it.



    Please do accept the solution and revert for further assistance.



    Thanks

    Rylee

  • Rylee Smith
    Rylee Smith Jun 01, 2009

    Please revert for further assistance.

    Thanks
    Rylee

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  • Master
  • 3,614 Answers

HI there,

When the screen goes to fade and goes to picture out, this can be the loss High Voltage

Loss of high voltage can be from a leakable path around the picture tube caused by dust and dirt; it can be caused by a weak flyback transformer that gives out after a long warm up; it can be from an overheated output transistor in the horizontal output stage; and others.

it still repairable but take note: Do not do it without careful instructions and experience to do it, as the high voltage can stay around for hours after the set is turned off. (35,000 volts is typical of a set your size.). you need help on this so better to call a repair man for the tv.

Posted on Jun 01, 2009

  • micromaster
    micromaster Jun 01, 2009

    thank you for using fixya.

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