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在2017年6月，Apple更新了13寸的MacBookair，他换上了更新更好的Intel Core i5处理器，让性能和电池续航时间提高。

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Won't turn on and no charging light

Hi, a client recently brought their Macbook to me because it wouldn't turn on or charge. I narrowed it down to the Power/IO board and it was replaced. To be safe I also provided them with a new charger.

All was working fine, then 24hrs later it randomly stopped working again. Sometimes it would turn on and charge, then sometimes it wouldn't. Now it won't turn on at all or charge.

I've unplugged the battery to see if it would auto turn on when connected to the mains (as it usually does) and still nothing. I've tried SMC reset etc.

I'm not sure what else to look for! I've disconnected/reconnected everything inside, checked for liquid damage/corrosion etc. I'm thinking maybe it's the logic board?

Anymore suggestions?

Thank you

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On this particular model, the first thing I might check is actually the trackpad. It’s easy to overlook because it’s under the battery. See if you get power if you unplug the trackpad. If so, pop the battery up and check to see if there’s any corrosion in the trackpad side of the connector, it’s fairly susceptible to even minor liquid contact in this model since the connector is close to the top edge of the trackpad and no protection from liquid entry through the gaps around its edges.

Otherwise, it’s probably safe to assume it’s a board issue. Which is still solvable in the right hands.

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Thanks for your reply, I forgot to say I'd already tried disconnected the trackpad and also looked for liquid spills.

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Got it. Sounds like you have ordered another replacement I/O board and cable. In the mean time, I would give the whole logic board a good once over. Both sides. Especially near the SMC, since it sounds like it was at one point resolved, and SMC issues can be sort of intermittent, but would definitely give the computer issues powering up.

The SMC is on the back of the board on this model. And even if it's above your level of skill to repair, it would be nice to have that "Oh yes, this is clearly a problem" sort of moment. And you can advise your customer appropriately.

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It looks like a short circuit in the charging circuit (it's on the motherboard). The Power / IO board looks like you will have to change it again - this one is also faulty.

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I have ordered a replacement Power/IO board. Although I am doubtful this is going to fix the issue. I have a horrible feeling its something burnt out on the logic board. Unfortunately above my expertise.

Thanks

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Wayne 将永远感激不已
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