1.8GHz dual-core Intel Core i5 (Turbo Boost up to 2.8GHz) with 3MB shared L3 cache

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Charging Faulty and Screen with Intermittent Blackouts

Hi there, I am just wondering if anyone would be able to tell from my description if the fault would lie within the logic board or the battery.

My 2012 A1466 Macbook Air sadly got severely water damaged by a whole mug of hot chocolate around 6 months ago, however, miraculously it did start to work fine once it had dried out and been cleaned up until recently.

Now the charge light on the MagSafe will not light up, save for sometimes showing a yellow/gold light (I am not colourblind I swear) intermittently. Sometimes it will charge however most of the time it will not but it does recognise that the charger is plugged in but won't take the charge and just stays on the same percentage. The screen also blacks out for a few seconds intermittently and then comes back on once you touch the trackpad. This seems to happen more once the battery gets low.

I have already replaced the power jack (left I/O assembly unit connecting MagSafe to the logic board) and that seemed to do the trick for a couple of weeks and now the problem has started again. I will replace the battery or logic board if need be but would like to know if anyone from the description has a good idea towards which to replace so that I can save a bit of time.


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Check the pins on the I/O cable, which goes over the fan and connects the I/O board to the logic board.

This cable is responsible for allowing the charger to communicate with the logic board, allowing the charger to light up. It also carries the SMC_LID signal to the logic board from the hall effect sensor on the I/O board, which detects when it is asleep. When this signal is low, it thinks the lid is shut and dims the screen. Have seen a few where it would randomly dim the screen, due to an intermittent connection caused by the I/O cable.

Check the cable and replace this.

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Just fiddled about with the IO cable and after pushing it in hard, it started working fine again! Must be a loose connection or fault so I will replace this accordingly, it is easy to overlook the small things!


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