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Possible Soundcard Issues, identifying which part to replace.

Hi there,

My early 2008 macbook pro A1260 2.5 is experiencing some problems. The main problem is that the sound card(I believe its the soundcard as the sound comes from internal speakers and headphone out) behaves very strangely. Sometimes it works fine but around 1/3rd of the time it will just give off static sounding noise, popping and cuts out while listening to any source of audio.

The laptop also will not stay on without the battery present and will not switch on either if he battery is missing. The battery appears to be fine and the magsafe is a 3rd party new one which definitely works. I have another A1260 laptop with a logic board that is 100% working so I am wondering if I should replace this in my current laptop or is it more like to be the left i/o board?

I checked he balancing left/right via preferences and the sound remains the same on both channels.

I have made a recording of it here, https://soundcloud.com/colin-mackay/nois... (can hear it clearly after about 2/3 seconds in, the static sound + popping). I am certain it's not blown speakers.

Any help would be much appreciated!

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your computer probably goes to sleep without the battery because you probably got a 60W charger instead of the 85w

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Would you mind giving us a link to support this statement?

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I know from experience. I guarantee if you use a 85W charger it won't go to sleep regardless of having the battery in or out.

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I some how don't believe you.

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Hi there,

It is definitely an 85w charger, it isn't however an apple brand one so this may have something to do with it.

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This is definitely a problem with the sound card, the sound card is the complex in the upper left hand section of the inside, under the left hand grill. The sound card is part of the wifi card and left i/o shield. The problem with the power will also probably be resolved by replacing this card as it is also part of the power management system. I think the only way to fix this is to replace the entire complex.

Hope this helps,

John H. Laney

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Brilliant mate that is exactly the info I was after, I will replace the part with the hopefully working part from my other laptop and see if it cures it.

Thanks.

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Just another snip-it of info the part that I was talking about is also where the graphics card is.

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I was under the impression the graphics card is on the Main I/o board and not the left?

I went ahead and replaced the left I/O board last night and it seemed to go fine however I haven't had enough time to make sure the sound issue has gone away but it certainly didn't make any of the issues in the short time I was using it. The laptop still goes to sleep when you remove the battery but that is something I can live with and doesn't really matter tbh.

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Well the main graphics is on the main board, but the part where the screen connects is on the left I/O board. Sorry for the confusion.

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Hi John, no worries, I replaced the left i/o and the sound issues have cleared up and the graphics have remained the seem, touch wood.

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Colin Mackay will be eternally grateful.
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