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MBA keeps shutting down due to temp even after heatsink and paste chan

I’ve got a 2012 MBA 13”

For over few months it started to randomly shut down - either while watching a stream, file transfer or using iMovie.

While using iMovie temps were rising to 100-103c all the time when exporting movie!

  1. I’ve started with changing the battery - old one was on it’s last stretch anyway. No improvement
  2. I’ve bought a new thermal paste (Arctic Silver 5) and applied it. Not much of a change
  3. I’ve installed software to monitor and tweak fans - this helped, but still using iMovie would raise temp to 100c with fans on max speed.
  4. 4) I’ve read about heatsinks that can leak… Mine was snapped on the leg behind the vent.
  5. I’ve replaced the heatsink with a used (not snapped) one and temps are basically the same as before!

My questions:

  • Did “new” heatsink was also a leaked one?
  • Is there any other reasons for CPU to overheat like that? Ventilator is working fine.

Update (01/23/2021)

Screenshots from TG Pro


Idle:

Block Image


After few minutes of exporting video from iMovie (system fan settings):


Block Image

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How much RAM does your system have as well as the size of your SSD and how much of it is used?

I would recommend installing a good thermal monitoring App like TG Pro can to post a snapshot of the main window showing all of the sensors and the fan Adicionar imagens a uma pergunta já existente

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Hi Dan, It's a 4GB version with 128GB SSD. I've replaced SSD few years ago to OWC one.

I'll try TG Pro and keep you posted.

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@eksajleee - How much free space does your SSD have?

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@danj 55gb free. I've updated my thread with screenshots from TG Pro. Thanks!

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Your system is fighting its self! It does not have the needed resources for what you are trying to do.

This gets into two areas too little RAM (system only has 4GB) so the system needs to use Virtual RAM to make up the difference leveraging the SSD. But, your SSD is too full (128GB with only 55GB free)! So it needs to constantly free up space for the next block of data it is processing (rendering here). Unlike HDD’s, SSD’s have a limited number of writes per block. This SSD is getting worn so wear leveling is kicking in hard!

Even though you have a fair amount of free space on the drive you really need a new drive. As a rule of thumb smaller SSD’s like yours a minimum of 1/3 of it should be free and larger SSD need 1/3 and the very large 2TB 1/4 free. But processing images and video rendering really taxes the system much harder and the larger project even more! The amount of data churn then can hit you as its doing here.

The short term solution is clean off your SSD to give your system more free space to run on. Use an external drive to hold your work, only having your OS and apps on your internal drive. Depending on the app see if you can put the scratch space onto the external to lessen the stress on your internal SSD given is current state.

Frankly, I would look at getting a bigger SSD (500GB ~ 1TB) as the first action. Upgrading your logic board to 8 GB of RAM would be even better with the bigger SSD.

But, given the age of this system it might be wiser and cheaper getting a newer MacBook Air used which has a better CPU, still more RAM (16GB) and a 1TB SSD.

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Thanks for your answer @danj - of course it’s not a perfect laptop for working on video, but I do not agree that it “fights for resources”. I can’t even watch streams online, participate in Zoom calls or do anything that brings cpu usage too high because MacBook keeps shutting itself after a while.

iMovie is an extreme example because it brings temp to 100c within a minute. Today it died after 40min on a Zoom call. This is definitely related to cpu getting too hot.

I already have 2x MBP 2018 & 2020 and powerful PC rig so I don't need to upgrade my MBA. I just wanted to fix issue on this one to keep it as a backup or sell it.

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@eksajleee - You missed the point your SSD is worn out! I've seen this often enough to see the signs.

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@danj I've replaced ssd 4 years ago to OWC one because it was dying on file operations. It was never used heavily in terms of file saving. Only started working in IMovie fairly recently.

Was working fine until last few months (it got dropped 2 times on the floor in the meantime if that changes anythin).

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@eksajleee - Replace the heat sink its self see if that does it 13" MacBook Air Heat Sink, Apple P/N 076-1387

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