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期待已久的MacBook Air更新到来,带来了全新的英特尔酷睿i5处理器、升级了的视网膜显示屏以及众多其他更新。发布于2018年11月7日。

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No life at all! How do I resurrect?

I have acquired a used MacBool Air, but despite being on charge for several days, I can't get any signs of life.

What can I do to bring it to life, or even to see if it’s worth taking to a fixer…

I have tried reset NVRam, Pram and SMC…

NADA… 😳🤞

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Check for the easy fixes first. Sounds like you did the usual resets. I would make sure the charger is good or try another one. I might also see if you can get it into DFU mode, and revive/restore if you have access to another Mac.

After that open it up and have a look. They do require a pentalobe style screwdriver bit, but that aside these open very easily. Look and see if anything is visually off. If nothing is obvious see below.

A few places I would check:

1. The battery, unplug it and see if you get power on just the charger alone. The fan will likely rev to full speed since the board is expecting data from sensors in the battery and in their absence it will go into a protection mode, assuming the battery is extremely hot when the sensor data is missing. So this is expected behavior when the battery is not plugged in. But a faulty battery can definitely prevent power on.

2. Check the USB C board. You can usually wiggle it out without removing any additional components. See if there is any corrosion on the pins, or any pins that are smashed together, missing, etc... where the charger plugs on. I have seen this a LOT especially with these Retina Airs. No liquid damage anywhere on the interior, but corrosion in the port.

3. The Audio board. These are prone to liquid damage and a small amount of damage to certain components can be all that is preventing the unit from powering on. Unplug it from the logic board and see if you get power. This will likely also make the fan run at full speed, for similar reasons.

4. The trackpad. Same reasons as the audio board. It's a place where water can easily creep in and murder some components. Unplug it from the board and see if you get power.

Any of these are an easy fix (aside from trackpad, it's easy, but getting it out is a bit of a pain on the 2018-19 Airs since you have to remove the logic board to get to the keyboard bit of the combined flex cable). If still no love after checking these, your issue is likely the actual board. In which case you can see if you might find someone who can repair boards to have a look. Unless it's just liquid damage everywhere, in which case a swap would likely be a better option.

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Hi Alisha... Nada... So I opened it up... and found that there was corrosion on the battery and particularly around the minijack port... So I removed the battery and the minijack and am planning to purchase replacements. My big question is that - even though those were the only areas where there seemed to be corrosion (water) damage, if I replace these things, will the mother board sill function? OR is it possible that there is damage elsewhere? I can't see any and I cant really test the board.... OR at this point, should I just take it to someone who really knows what they are doing. I can put new things back how I removed them - I'm pretty practical at that stuff, but anything more... I wouldn't trust myself.

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@uberdirektor It's hard to know for sure. But chances are, if you pulled the whole machine apart and didn't find damage anywhere else, I would say your chances are decent. (If you didn't, make sure to look at the back of the board, and in the area of the vent where the TCON board from the display sits because liquid there is bad news) But it sounds like you got corrosion around the headphone jack and on the battery board? Right? So that bodes well for a liquid entry on that side of the machine. Which I would say gives you pretty good odds. I would be most concerned about Touch ID? Since that's plugged into the Audio board and needs to be paired to the logic board by Apple for Touch ID function to work.

If you unplug that audio board and the battery, do you get any power if you plug into the charger. It should boot without both of those plugged in.

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Having taken out the audio board in the corner, there is no link to the ON/OFF button, correct? So I got no indication of power. Should I try to save this thing?

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I managed to replace the audio plug and the cable and the battery for £80 and BINGO... It fired up! Thanks for all the advice!

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@uberdirektor Excellent! Glad you got it up and running.

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Good evening,

First thing to do is check the cable and/or power adapter as either could be faulty.

If nothing avails from that, take apart the machine and check the internals.

If all those check out your last option is to get a battery (Recommend from ifixit).

Here's the link: https://australia.ifixit.com/products/ma...

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Thank you! I checked the internals. See above.

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