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headphone jack interference issues on dv5t

Discussion in 'HP & Compaq' started by joshua wood, Sep 1, 2008.

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  1. joshua wood

    joshua wood Notebook Consultant

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    Hi all,

    Anyone with a dv5t that would care to help me out? I have one, and I also have a pair of ultimate ears super.fi 5 pro earphones (worth US$250). So these are good quality earphones. But like other (even cheaper) earphones, they appear to transmit more "interference" than regular headphones, I believe because they are easier to "drive" (less voltage required?).

    I've noticed that both headphone jacks are the same. There is very minor white noise when plugged in, and more interference produced when using the touchpad or usb mouse. This is significantly more noticable than the constant white noise. Especially noticable is when you move a window around. There is a significant amout of interfence produced.

    Now all of this really isn't noticable when music is playing, but it is still there non the less and certainly noticable when there is no sound playing, and wanting to get into music production, am wondering if others are experiencing similar issues. I returned a Dell at the start of the year due to extermely (ie a lot worse than this) bad interference issues.

    As mentioned, regular headphones might not reproduce this. I have yet to try my senheisers. Any feedback on this would be appreciated. The interference is regardless of the mute function, so it's not a driver issue, purely electrical.
     
  2. joshua wood

    joshua wood Notebook Consultant

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    Ok, the interference only is there on AC power. Anyone else experienced anything similar? From reading, it's either a ground loop or DC hash something or other. It's not noticable on all headphones or speaker systems, but it is on mine and I shouldn't have to buy a new sound system because HP haven't solved some issues. Hopefully I just have a bad AC pack.
     
  3. netkiller

    netkiller Notebook Consultant

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    It happens on all HP Pavilion Laptops. Heck I could hear the Hard Disk Drive spin faster.
     
  4. joshua wood

    joshua wood Notebook Consultant

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    I don't believe my brother's older pavilion does this. And it's not quite, it's very noticable.
     
  5. wifi1

    wifi1 Notebook Geek

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    I haven't noticed any interference. I have regular Sony earbuds though. I'll go check it out later when I'm at home though.
     
  6. joshua wood

    joshua wood Notebook Consultant

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    Thanks - in particular, move a window around, that really gets it going. Make sure you are on AC. It doesn't not matter about volume level or mute status are it's nothing to do with the drivers. You can hear this in the bios for eg.
     
  7. JoeCHecht

    JoeCHecht Notebook Consultant

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    I have 3 DV9500T's, and have this problem. I have tested with 15 different power bricks that I have scattered throughout the house, and all have the noise.

    I tried plugging the power bricks into numerous UPS systems, some having noise suppression, with no luck.

    Once a week, we switch to aux power to cycle our hurricane backup power system, and I noticed the problem went away when I plugged the power brick into any of our AIMS pure sine wave inverters that we have.

    I also recall the problem does not happen in the car, where the power brick is also plugged into a AIMS pure sine wave inverter (two more power bricks tested).

    So, there ya go. Tested with 3 HP laptops, and a total of 17 power bricks :)

    Joe
     
  8. hamsterjam

    hamsterjam Newbie

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    Same fault here... with a hp dv9823 cl... i',m tearing my hair out with this one....at the moment ... trying to explain to someone in india the fault.... i asked to speak to a supervisor... as we are having communication probs... it's fine when not plugged in
     
  9. JoeCHecht

    JoeCHecht Notebook Consultant

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    I see the thread growing, with "its ok when not plugged in"...

    Again, when the power brick is plugged into a quality pure sine wave power source, no problem. Tested on 3 DV-9500's, and 17 power bricks.

    So, the problem must be noise from the power brick (or a lack of line noise suppression).

    Also, you will get noise from the card reader too.

    J
     
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