No boot on battery power - 820-3435-B

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2014年初 MacBook Air 11"

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akiwi92 @akiwi92

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发帖于: 2019年11月13日

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No boot on battery power - 820-3435-B

Hi guys,

So I picked up a cheap MacBook Air 2014 (820-3435-B) which had a puff of smoke out of the back when being used.

Apple store said to the guy it was “a blown transistor”.

I opened it up and could see one of the capacitors was damaged (C7140) and crumbling. I replaced it which was a feat for me! Plugged in and it turned on, there isn’t an SSD so I got a flashing folder which I was really happy with!

However, I’ve now realised it doesn’t boot on battery power. Where do I go from here? I checked R7006 which was fine from what I could tell.

I am installing Catalina tomorrow so I will be able to tell if the battery is recognised and if charge is shown.

Feeling deflated after what I thought was a great success!

EDIT

Entered the following in Terminal “pmset -g batt”

Now drawing from ‘AC Power’

-InternalBattery-0 (id=11337827) 0%; AC attached; not charging (Poor/Good)

failure: “Permanent Battery Failure”

Detailed failures: “Externally Indicated Failure” present: true

EDIT 2 - Ran CoconutBattery

EDIT 3

It was indeed the battery, bought a used one on eBay and it works perfectly

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After you get the OS installed download this app CoconutBattery lets see what it tells us. Post a snapshot of the main window here for us to see 在已经存在的问题里加入图片

由 Dan 完成的 2019年11月13日

@danj Hi Dan, so I can't install an OS at the moment as the SSD adapter I ordered was wrong! :(

But I am booting from USB and I have updated my post with the error I get in terminal!

由 akiwi92 完成的 2019年11月14日

Can you install CoconutBattery onto your booting drive. I find that offers more useful information combined. You don't need the full version.

由 Dan 完成的 2019年11月14日

@danj It is a macOS install drive, how can I install it on there? Sorry I am not the most fluent mac user!

由 akiwi92 完成的 2019年11月14日

Well you can't do it to the bootable OS installer drive, but creating a bootable drive (using the installer to create it) you can then just install it double clicking on the installer file.

由 Dan 完成的 2019年11月14日

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After you get the OS installed download this app CoconutBattery lets see what it tells us. Post a snapshot of the main window here for us to see 在已经存在的问题里加入图片 — Dan
@danj Hi Dan, so I can't install an OS at the moment as the SSD adapter I ordered was wrong! :(

But I am booting from USB and I have updated my post with the error I get in terminal! — akiwi92
Can you install CoconutBattery onto your booting drive. I find that offers more useful information combined. You don't need the full version. — Dan
@danj It is a macOS install drive, how can I install it on there? Sorry I am not the most fluent mac user! — akiwi92
Well you can't do it to the bootable OS installer drive, but creating a bootable drive (using the installer to create it) you can then just install it double clicking on the installer file. — Dan

Dan @danj 声誉积分: 479.4千 Self employed contract worker 35 329 971 · Answer 1 · 2019-11-15T12:12:31-07:00

Dan @danj

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发帖于: 2019年11月15日

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The charging logic on the main logic board has failed. The puff of smoke was likely one of the MOSFET’s burning. You’ll need to inspect your logic board for damage or spillage.

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Well when I replaced C7141 you could see a mark on the board where it had blew and where it presumably smoked, it wiped off with alcohol but it was the remnants of something that had burned.

Can you advise on where I should be looking in the schematics for the charging section so I can try and do some digging?

Thanks for all of your help! Does it seem like the battery is indeed healthy just not charging?

由 akiwi92 完成的 2019年11月15日

@danj Just to update you it was indeed the battery and a new one I got used from eBay works perfectly!

由 akiwi92 完成的 2019年11月26日

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2014年初 MacBook Air 11"

No boot on battery power - 820-3435-B

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