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The April 2014 update of Apple's 13" MacBook Air features refreshed dual-core i5 and i7 processors, plus slightly increased battery performance.

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Sound cuts in and out.

My wife's Mac had a wine spill, she took took it to the mac store and was told $600 min. to repair. She bought a new mac. The old mac would not power on so I figured I would replace logic board when prices fell. 9 months later the laptop I was using died so I disassembled (have been electronic tech for years). Only found one trace of the spill on the back side of board, cleaned it and reassembled. Everything worked when I powered back on! I used it for a few weeks and then noticed I had lost the startup chime and had no audio when booted. Tried resetting SMC with intermittent success. I do not see the audio chip in a device list when it fails. I have disassembled and reassembled many times, sometimes regaining audio only to loose it again later. Does anyone know where the chip is on the board or an area I should look at? Any and all help is greatly appreciated.

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The audio circuit is mostly located on the I/O board (side board) on the Airs. Most likely you have burnt the I/O cable, which runs over the fan, so check the pins on this cable for liquid damage or burnt pins. If you see damage to this, just replace it. Check the bottom of the I/O board and if there are any burnt components, replace this.

When the pins for audio on this cable get burnt, it will stop the speakers appearing in the output list in sound settings.

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Thanks, the spill was only on the bottom of the logic board, but I did notice some of the pins looked darkened on the flat cable connector though no liquid got anywhere near that end. I have one on the way as well as a replacement i/o board. Will update once parts are in.

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Replaced I/O board and cable, all works as it should! thanks you!

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Gary Woodruff will be eternally grateful.
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