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How to Identify if left io board or logic board needs replaced?

Hi,

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?

Thanks

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Hi there, 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.

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We need to do some diagnostics to determine what's wrong.

Go to system preferences - sound - move the balance toggle back and forth tell me what you hear. Plug earphones in and do the same.

The speakers on the MacBook often sound like they are blown, particularly the left speaker. The defect is quite noticeable if you reboot the machine with the volume turned all the way up. The Apple startup sound will cause the speaker to pop and crack everytime.

If a high frequency squeal emits from the left side of the computer, near the keyboard. Disabling the second core of the processor or running a program that prevents the processors from being idle will eliminate this sound (like PhotoBooth). Apple acknowledges the issue. http://support.apple.com/kb/TS1823?viewl... AppleCare representatives have been instructed to tell customers the noise is part of normal operation and is not a defect

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Hi there,

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.

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Hi there, 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.

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Its the sound card, this is fairly easy to replace. It is the complex farthest to the left top corner. It is in the same complex as the airport extreme card.

Hope this helps,

John H. Laney

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