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모델 A1278, 2012년 6월 출시. Turbo Boost가있는 Intel 프로세서, 최대 512 MB DDR5 비디오 RAM

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Why does my laptop keep turning off and heating up randomly?

Hello,

I’m posting on behalf of my friend’s laptop. These are the problems that he’s noticed:

  • Starts heating up a lot so the fan speeds up to compensate and is therefore loud. At this point the trackpad usually becomes slow and jittery. The laptop turns off soon after. The laptop activity when this happens is very mild e.g. watching YouTube videos or browsing the web.
  • The laptop only turns on when holding SHIFT down along with the power button.
  • The laptop screen glitches when typing or moving the mouse
  • Sometimes, the laptop won’t turn on at all. It will get to the grey loading screen and then it will turn off.
  • The laptop sporadically turns off, even if the laptop hasn’t heated up.

I think it’s important to say that we upgraded the laptop’s hard drive a few months ago (March or April) because we wanted to make the laptop faster and more catered towards creative apps e.g. Logic Pro. We upgraded it from 500gb hard drive (original Apple stock) to 1 TB SSD (Samsung EVO 860 1tb). It was working fine and actually really improved the laptop’s speed. However, could this be why the laptop is acting up?

I’m aware that this problem can be caused by a faulty or old battery however, we’ve also tested the battery using the Battery Health 2 app. It’s 5.8 years old however it’s saying the battery is still in good health. Picture attached below for reference.

Block Image

Do you have any suggestions on what he could do e.g. SMC reset? He said that he did this already but that it hasn’t worked. We will try again later and update you.

We’ve tried the Apple Hardware Test too but it doesn’t take us to the normal screen, it takes us to internet recovery which then says that there are no problems.

He won’t mind replacing any parts as long as it isn’t too difficult to do or to obtain.

Thank you very much!

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가장 유용한 답변

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MacBook Pro 13" Unibody Mid 2012 Hard Drive Cable Replacement

You have two issued that jumped right out at me.

First replace the hard drive I/R cable. Apple did this for free for a while but no longer. It gets damaged by coming into contact with the bottom cover. After replacing it use pads on either side of the cable as shown in this photo.

Next on the overheating, your test sink has probably leaked the coolant out at the crimped end. Examine the logic board for and oily stain. Also replace the thermal paste when you replace it:

MacBook Pro 13" Unibody Mid 2012 Heat Sink Replacement

After you have fixed these two issues, see what may still be malfunctioning and get back with us. The keyboard has probably gotten some liquid damage and may need to be replaced, but we have guides for that and it’s a cheap fix, just takes a couple of hours.

MacBook Pro 13" Unibody Mid 2012 Hard Drive Cable 이미지

안내서

MacBook Pro 13" Unibody Mid 2012 Hard Drive Cable Replacement

난이도:

보통

20 - 30 minutes

MacBook Pro 13" Unibody Mid 2012 Heat Sink 이미지

안내서

MacBook Pro 13" Unibody Mid 2012 Heat Sink Replacement

난이도:

어려움

45 minutes - 1 hour

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Hello Mayer,

Will definitely try this out and get back to you.

Thank you for your help.

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