Mid 2010 Model A1278 / 2.4 or 2.66 GHz Core 2 Duo processor

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Diagnose integrity of microphone and logic board

Hi all,

I am have not been able to use the microphone on my macbook pro v13 mid 2010 for some time now and I am trying to determine the cause of the trouble. If I can get enough feedback I will try and make a help me guide for diagnosing the problem.

I am currently running Mac OS10.8.2

Here is what I know:

1.) The logic board identifies that the Internal Built-in microphone is present and displays the option in system sound preferences. This is the same for the Line-In from the input port

2.) I see no activity from the input level from either the built in or the line-in microphones. However, if I plug-in or remove a microphone into the input port I see a quick fluctuation on the Input level of the line-in.

3.) I have checked the Audio MIDI options and adjusted the format to all possibilities given under the windows options, no change.

How possible is it that there is a bad connection with the microphone cable given the trouble exist for both the Internal and line-in microphones? Is there anything else I can check?

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Your system has a dual Analog/Digital input (as well as output). Do you have the ability to connect into your system a digital sound output optical source (LCD TV)? if you can does it work?

It's possible the sockets switches have become damaged or dirty.

Have you tries using Apple Hardware Test {AHT} to see what it shows?

Let us know what you find out - Good Luck

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your asking in I can use the Digital/Analog cable to output sound on my television? I have done this before and it still works. I have also output the sound through HDMI cables on the system. It is only the input through the Analog/Digital Input that is showing me difficulty. I am going to try the AHT and see how that works as well as try and remove some dust from the socket switches on the input. I'll post what comes back. Thanks for the ideas.


In this case using your Digital optical output connection from your TV into your MBP (digital optical input).


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It's possible the audio board has a bad component affecting both. As a work around you could try a USB Audio Adapter... USB audio works separate from analog/digital ports. Some adaptors are also microphones.

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If all else fails this may be what I end up doing. Thanks.


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Jeff will be eternally grateful.
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