Question about ViewSonic PJ458D Multimedia Projector

2 Answers

PJ458D Displays Multiple Lines and scrambled picture

My projector recently started showing horizontal lines across the screen after it has been on about half an hour. The lines flash on and off and get bigger. It looks like the "white noise" image on your standard television if I leave it on about 45 minutes. I've stopped using it. What's wrong and how do I fix it?

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  • Aladdin Minic
    Aladdin Minic May 11, 2010

    What do you mean by "White Noise" image?



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2 Answers

White noise-the image you get when you turn your television to a channel that isn't receiving a signal. Sorry, this is an old term for on-air televisions. Its kinda the same image you get when your DirecTV signal gets scrambled during a thunderstorm.

Posted on Sep 20, 2008

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  • 61 Answers

Take out the comb filter and replace the surface mount electrolytic capacitors on the comb filter and put it back in the motherboard. MCM sells a kit with capacitors that fix this problem.

Posted on Sep 21, 2008

  • Aladdin Minic
    Aladdin Minic Sep 21, 2008

    The frequency, regardless of which color the lines are should be in sync and not have a White Noise image.

    In signal processing, a "comb filter" adds a delayed version of a signal to itself, causing constructive and destructive interference. The frequency response of a comb filter consists of a series of regularly-spaced spikes, giving the appearance of a comb.

    Since the "electrolytes" evaporate, design life is most often rated in hours at a set temperature.
    For example, typically as 2000 hours at 105 degrees Celsius (which is
    the highest working temperature). Design life doubles for each 10
    degrees lower, reaching 15 years at 45 degrees. Most Electrolytic capacitors are rated for 85 degrees Celsius maximum.




  • Aladdin Minic
    Aladdin Minic Sep 21, 2008

    That is if your up to soldering......

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