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The set turns on and there is audio. the backlight shows dimly but there is no video. I am using the composite input but component input is the same. I have ruled out the digital board.

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  • Phil Day Dec 10, 2009

    Rylee, this set is a plasma tv Sylvania 6842PFM. The power supply turns on and the digital board is new.



    Phil

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2 Answers

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  • Master
  • 8,619 Answers

Hi


Thanks for using FixYa. The fault protection circuit has detected a fault and has turned the TV off. You'll need to check various things to find out which part is bad. Please check these---

1. Check for signal cables at the back and also try unplugging the TV for 8-10 hours to reset it.

2. Also check for any swollen/bulged capacitors on the power supply board. This happens due to overheating of capacitors.

3. If the capacitors are fine then you'll need to check for connectors on all the boards and also the fans if they are working fine.

4. Make sure the lamp connections are fine and ballast is not burnt.

Note-- Please make sure to turn off and unplug the TV for at least 1 hour (this will drain off current from all components especially capacitors) before you perform any repairs. Also note that the TV consists of very high voltages even when it is in OFF condition.

Please do accept the solution if the issue is resolved or else revert for further assistance.


Thanks

Rylee

Posted on Dec 10, 2009

  • Rylee Smith
    Rylee Smith Dec 10, 2009


    Hi Phils








    I am really sorry that I just read the Heading which was
    showing Projection TV troubleshooting and didn't request you to provide me the
    make and model # and provided the solution for it. A plasma TV needs twice
    as much input current as any other TV. Unplug the TV for more than an hour to
    drain the current. If still the issue persists, then it means that some
    components might have failed or gone bad. These sets uses cold solder
    connections. Whenever a problem is detected by the safety circuitry it will
    shut off the TV to avoid further damage to the unit. There are more than 2,000
    parts including millions of transistors inside the integrated circuits.
    You’ll need to check the leaking or bulging capacitors which might be required
    to be replaced to resolve the issue. If still the issue persists then it might
    be due to the high voltage shutdown which might be exceeded 33k and the unit
    shuts it self down to protect other parts being damaged. As the power supply is
    new, please check power supply regulation and horizontal circuits. If these are
    fine then it means SSB has gone bad. You’ll need to replace SSB. The
    other possibility is X sustain Y sustain and buffer boards which controls
    picture, fires the gas, and many other functions. No image is a very common
    problem. It is always better to replace both sustain boards. If you feel that
    you are qualified to diagnose and repair the TV then go ahead otherwise it
    should be done by a professional TV tech. However, be careful while doing
    repairs on any TV because there is always high voltage present even when the TV
    is in off position.






    Please do accept the solution if the issue is resolved or
    else revert for further assistance.









    Thanks





    Rylee



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  • Master
  • 11,896 Answers

I would say ballast or light bulb is faulty. Could be high voltage transformer but since you have audio, I would rule that out

Posted on Dec 10, 2009

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1 Answer

How to connect composite and component


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I hope I have been of help but please do not hesitate to ask if you have any further questions.
I appreciate your vote if you appreciate my reply and remember, even if you don't vote for me a please and thank you goes a long way.

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