Dead MBA, but not the motherboard - ideas?

Question

MacBook Air 13" Mid 2011

모델 A1369, 1.6, 1.7, or 1.8 GHz 프로세서, 64, 128 또는 256GB 플래시 저장공간

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Allen @ramatsu

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게시일: 2017년 2월 26일

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Dead MBA, but not the motherboard - ideas?

We heard a loud humming noise coming from the next room where this MBA was, and I actually don't know if it was coming from the attached speakers as I assumed, or from the MBA itself. Moments later it died, never to be woken again.

I jumped right to the motherboard solution based on my local repair shop, who doesn't do this kind of work. But after replacing the motherboard, still dead. I didn't have any extraordinary difficulties with the transplant, and went slow and careful on the reassembly, so I think it's unlikely that's the cause.

A bad replacement board is possible but also seems unlikely. So, any other components that would be good candidates for this?

Only other symptom besides "dead" would be that the magsafe connector does not light up when plugged in and attached.

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Reece @reecee

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eFix Ltd (UK)

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게시일: 2017년 2월 28일

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I would start off by trying a new charging board, getting a charging light is priority. This part is responsible for the charger to communicate with the logic board, so it knows it is ok to charge. If you are still not getting a light, try the I/O cable. Any other issue with the charging light will be related to the battery or logic board, so disconnect the battery whilst troubleshooting this.

Check the MacBook for liquid damage, check the charger port for burn marks and change the charger if it has not been bought from Apple.com, since it will likely not be original and probably caused this if so.

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Thanks - don't remember a separate charging board, but I'll look for it. Would that brick the whole computer? I suppose if it died and the battery went dead at the same time as the loud noise, it would act bricked until there was a new board, but that would be a weird coincidence.

The MBA has just been sitting on the same desk for years, no liquid or 3d party chargers involved, just the loud noise and poof - dead Mac.

Allen 의 2017년 2월 28일

Either the charging board, logic board or battery can prevent boot. Try disconnecting the battery and seeing it it will boot. It might be best to send it somewhere to check out, who have the testing parts available.

Reece 의 2017년 3월 1일

Thanks @Reece - I ordered a replacement charging board (I/O board really, for that model) and will cross my fingers. Wish I'd had the tip on trying it with the battery disconnected before I ordered it, but if the new board doesn't do the trick I will try that while I'm in there. By the time I'm done here, I'll have most of a replacement MBA sitting around in parts! :-)

Allen 의 2017년 3월 1일

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Thanks - don't remember a separate charging board, but I'll look for it. Would that brick the whole computer? I suppose if it died and the battery went dead at the same time as the loud noise, it would act bricked until there was a new board, but that would be a weird coincidence.

The MBA has just been sitting on the same desk for years, no liquid or 3d party chargers involved, just the loud noise and poof - dead Mac. — Allen
Either the charging board, logic board or battery can prevent boot. Try disconnecting the battery and seeing it it will boot. It might be best to send it somewhere to check out, who have the testing parts available. — Reece
Thanks @Reece - I ordered a replacement charging board (I/O board really, for that model) and will cross my fingers. Wish I'd had the tip on trying it with the battery disconnected before I ordered it, but if the new board doesn't do the trick I will try that while I'm in there. By the time I'm done here, I'll have most of a replacement MBA sitting around in parts! :-) — Allen

MacBook Air 13" Mid 2011

Dead MBA, but not the motherboard - ideas?

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