Question about Hitachi 42EDT41 42 in. HD-Ready Plasma Television

5 Answers

Y Component Cable Related - Internal Static Noise

My Hitachi 42EDT41 42" has recently began giving off an unusual static noise from some internal component within the set. It has not effected picture or sound quality yet. I have trouble shot cables, connections and external components was able to isolate the problem and make the static noise go away when I pull the "Y" video component cable from the AV1 port. When I put the Y cable back in its port the static clicking like sound comes back. This problem exists using any of the avaliable inputs (AV1,AV2 or AV3). I fear there is some resistor or internal connection that needs replacement or cleaning. Any ideas ???

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  • Derek Feb 17, 2008

    No. It is not volume related. It appears to be an internal component un related to audio or video quality.

  • Derek Feb 17, 2008

    I have bypassed the cable box all together and run the cable from outside directly through a grounded surge protector and then straight in to the back of the t.v.- problem still exists.

    Everything is well grounded now and the problem still exists. This sound is definetly coming from an internal board.
    What is an "SSB" and what do they cost?

  • Derek Feb 17, 2008

    I am using high quality Gold Monster Cables and have swapped them out several times. Problem still exists :(

  • Derek Feb 17, 2008

    no overlapping external cables

  • Derek Feb 17, 2008

    connections are firm and snug and I am using higher quality cables. set is well grounded through a surge protector equipped with a ground connection.

    I did notice that the noise is more predominant with higher intesity color arrays being displayed on the screen. When you go to darker toned pictures the intensity of this static noise is not as apparent.

  • Derek Feb 17, 2008

    it is coming from more the left side facing the screen, so it must be associated with z-sus board. where do i order these parts and can i make the repairs or do i need a certified tech?

  • Derek Feb 17, 2008

    thank you for correcting me. that's exactly what it sounds like "voltage ringing" and it has gotten louder over the course of time...i think you have nailed it!

  • Derek Feb 17, 2008

    ouch! that really hits the wallet hard...i may just live with the noise until it gets to a level that cannot be tolerated. is there a way to prevent this from happening again, once it has been repaired?

  • Derek Feb 17, 2008

    i suspect this is not related just to this model and could happen to any form of flat panels regardless whether they are lcd or plasma based? i'll just have to take my lumps at some point and dish out the $$$

    thanks for your comments and technical advise in matters.

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5 Answers

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  • Master
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DId you try a different cable? If not try and let me know so that we can get on with any repair work..

Posted on Feb 17, 2008

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  • Hitachi Master
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Does the noise increase of volume when you turn up tv volume?

Posted on Feb 17, 2008

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I've had this happen to a customer of mine, we found that the cable box was not grounded to the house ground to prove that it was not the TV we used an adapter to remove the ground from the TV.the noise went away. we also removed the cable the cable box then used the dvd player thru component and there was no noise. we had the customer call the cable co. to resolve his issue. so try it and see if the noise goes away.
if it doesn't replace the SSB board.

Posted on Feb 17, 2008

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  • Robert Johnson Feb 17, 2008

    since this is not audio problem, listen for the noise to come from the left of the unit, or the right of the unit facing the screen. if the noise is from the left replace the z-sustain board inside the set. if from the right then replace the y-sustain board inside the set.

    z-sus pwb part # TS05681

    y-sus pwb part # TS05679

    these boards are not component level repaired board only repair.

  • Robert Johnson Feb 17, 2008

    the ssb is the input board also know as the video card. but since this is not an audio problem this board is not the fault. the sustain boards drive the display and use high voltage. static discharges are not normal but voltage ringing from the coils are normal to an extent. they get louder when contrasted bright sceens are present. but if this is too loud then you must replace the components in the scan ciruit. lastly, not be a downer but, the panel can cause the sustain boards to over drive and soon fail. but the first paln of attack is the sus boards.

  • Robert Johnson Feb 17, 2008

    you can get them from www.vancebaldwin.com price $218.10. if you are not familar with plasma repair do not attempt the repair yourself you may cause problems inside (fragile ribbon connectors inside). any qualied tech can do the repair. but I've said it before DYI's go at your own risk it's your money (life). good luck!

  • Robert Johnson Feb 17, 2008

    unfortunatly it's due to capacitor on the sus boards changing value past the tolerance of the writen value. again the panel can cause the over driving of the sus boards too. there is realy nothing you can do to prevent this it is the nature of the components insde.

  • Robert Johnson Feb 17, 2008

    yes that is true it's not brand specific or style of electronics. the components within the set can be made by dozens of manufactures but only assembed in one or two factories.

    ddon't forget to rate my solution as fixya thanks.

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  • Master
  • 1,944 Answers

Hi,

Are there any cables overlapping?

Posted on Feb 17, 2008

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  • Master
  • 2,267 Answers

It sounds like one of those cables has a defective ground. The static noise you are experiencing is cause by the cables not inside the TV. Try using different cables to isolate the problem and get new ones.
Good Luck.

Posted on Feb 17, 2008

  • Jaime Hernandez Feb 17, 2008

    I forgot to mention to check the source of your video as well, a loose connection or ground will cause the noise as well.

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