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Acer Aspire T671 PC - whistling noise

Discussion in 'Hardware' started by oldbeefer, Nov 10, 2010.

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  1. oldbeefer

    oldbeefer Thread Starter

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    Hello. friend has the above PC. For some time now, at random intervals, it will emit a 4 second whistle (haven't heard it myself, but assume its from the mobo speaker) followed by 2 secs of silence. Desktop is frozen. Noise continues the same cycle until PC powered off. The inside is dust free and all connections seem secure. Any thoughts, please?
     
  2. win2kpro

    win2kpro

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    "Whistling" or "whining" is many times indicitive of a defective capacitor or capacitors.

    Take the side off the machine and use a bright light to look carefully at the capacitors. The capacitors are small can type objects that should be perfectly flat on the top. If any have "domed" tops (often described as "bulging" or "swollen"), are leaking a brownish looking fluid, or the capacitors are leaning (not perpendicular to the motherboard) they may be defective.

    Attached is a link showing what you should be looking for.

    http://www.badcaps.net/ident/

    Bad capacitors may not be near as bad as some of the ones pictured and still be bad. Also, you may notice a slight "metallic" or "amonia like" smell in the case. You may also notice a "whitish" looking "residue" on components near the capacitor(s). This is residue caused by capacitor "gassing".

    "Domed" capacitors in the early stages of failure can be hard to identify. One thing that may help identify them is to take an old credit card and cut a small square out of a corner of the card. Lay the square on top of any suspicious capacitors and you will be able to see if the capacitor is becoming "domed" by the angle where the square from the credit card rests. The square from the credit card tends to "magnify" the extent of "doming".

    Also, if the machine has an add in graphics card, remove the card and check the capacitors on the card.
     
  3. oldbeefer

    oldbeefer Thread Starter

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    Thanks - I'll have a look, but the odd thing is that the noise is so precise - 4 secs on and 2 secs off, so looks more like a diagnostic noise?
     
  4. win2kpro

    win2kpro

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    Have you looked in the manual for the machine for diagnostic codes?
     
  5. oldbeefer

    oldbeefer Thread Starter

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    I will, if I can find one on line!
     
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