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Right channel Crackling noise.

Discussion in 'Laptops' started by mike, Mar 3, 2008.

  1. mike

    mike Guest

    I have a Dell Inspron 3700. The right audio channel makes a crackling noise
    on signal peaks. Sounds just like what you hear when the speaker has
    junk in it or is binding up.
    But the same noise comes out the headphone jack.
    It's loud enough to be annoying, but not so loud that you can see
    anything obvious on an oscilloscope. It's not clipping.
    Doesn't do it much when cold, but gets worse as it warms up.
    I'm using powered speakers, so shouldn't be heating up the output stage.

    Assuming I can construct a test signal so I can see the problem on
    the scope, it's gonna be a nightmare to suspend it all disassembled
    and working so I can probe it.

    Anybody experienced this? fix? Audio section schematics? Do they use
    an audio chip I'll be able to find docs on?
    Thanks, mike
    mike, Mar 3, 2008
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  2. mike

    Quaoar Guest

    Don't bother: the sound chip or one of its supporting components is
    fried, IMO. This is a mainboard replacement, and I don't know of any
    notebook for which a mainboard replacement is less expensive than a new
    notebook. Well, unless the jack has corruption on its surfaces. Do you
    smoke? Cigarette smoke is a killer of jacks.

    BTW, your Inspiron 3700 is more than six or seven years old? This age
    is terminal for most notebooks, unless it was operated in a clean room
    with a filtered AC supply.

    Quaoar, Mar 4, 2008
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  3. mike

    mike Guest

    I thought I was pessimistic.
    As luck would have it, it was operated in a clean room with a filtered
    AC supply.
    mike, Mar 4, 2008
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