High CPU temp / Max Fans Intermittent after battery & keyboard replace

Question

Retina MacBook 2015

Repair information and guides for the 2015 Retina MacBook Air. Model A1534

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Tattwa @tattwa

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crwdns2931729:0crwdne2931729:0: Dzi 28, 2022

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High CPU temp / Max Fans Intermittent after battery & keyboard replace

Hi Everyone,

I recently replaced a battery and a keyboard in a MacBook 2015 Pro and having issues with it randomly going to 100c and max fans as well. Mainly at bootup.

Ran Apple Hardware Test and reported no issues.

Nothing running that could cause it to heat up that much. Even going into the Apple Hardware Test it would rev up even before running the tests.

There wasn't this issue before replacing the parts that I'm aware of.

Any ideas on what could be the issue?

Attached TG Pro images:

Thanks heaps

Leigh

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I would install a good thermal monitoring app like TG Pro so you can see what's happening both at the thermal sensors and fan's. Take a snapshot of the main window making sure to capture all of the sensors and post it here for us to see Adding images to an existing question.

crwdns2934271:0Dzi 29, 2022crwdnd2934271:0 Dan crwdne2934271:0

Hi @danj, thanks heaps for the reply. Sorry about the delay.

I've attached some screenshots of TG Pro.

Supposedly the persons who's MacBook it is said it was doing it before, but i didn't notice it before changing the parts.

Thanks heaps

Leigh

crwdns2934271:0Dzi 30, 2022crwdnd2934271:0 Tattwa crwdne2934271:0

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I would install a good thermal monitoring app like TG Pro so you can see what's happening both at the thermal sensors and fan's. Take a snapshot of the main window making sure to capture all of the sensors and post it here for us to see Adding images to an existing question. — Dan
Hi @danj, thanks heaps for the reply. Sorry about the delay.

I've attached some screenshots of TG Pro.

Supposedly the persons who's MacBook it is said it was doing it before, but i didn't notice it before changing the parts.

Thanks heaps

Leigh — Tattwa

score 0 · Answer 1 · 2022-05-01T07:07:24-07:00

Dan @danj

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crwdns2931729:0crwdne2931729:0: Mud 1, 2022

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I don't see the fan in your capture, that's important too! But we need to see all of this during the time things are struggling. For now I think we have a good enough clue on what's happening.

We can see the high water marks (the lines) which tells me the system has encountered time points when the processing load was quite heavy! I think your issue is likely a very full drive and/or running too many tasks concurrently.

So lets get a better idea on whats happening under the covers!

Look at your drive size and how much is free (unused) you want to have between 1/4 and 1/3 unused. If you don't do a good clean up getting rid of old stuff or back it up.

Next, the next time things get rough, open up Activity Monitor its in your Application/Utilities folder click on the CPU button and % CPU column so the most used is on the top, see what processes (apps) are running hard. Compare it to when things are normal thats what you need to drill down on what these processes are doing.

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Hi @danj , thanks for the reply. I checked the Activity when it was going hardcore before and didn't really notice much in there.

I noticed it did it when starting the Apple Hardware Test as well. Just going into the interface not even starting it.

We put some more thermal paste and seems a little bit better but still running 70-90 degrees sometimes and not much happening.

Could it be an issue with Monterary as well?

Thanks

crwdns2934271:0Mud 2, 2022crwdnd2934271:0 Tattwa crwdne2934271:0

@tattwa - The version of macOS is the least likely issue here. Why would your system have such problems when hundreds of systems like yours are running just fine.

So what is likely different between yours and these other systems?

A vey full drive can cause Wear Leveling to kick in which moves files around so the free blocks are not the most overly worn. This is unique in SSD (Flash) drives like what your system has. Which is why I always recommend having at least 1/4 of the drive empty and with smaller drives 1/3 free.

Another issue is whats running on it. Apps or maybe something nasty like malware or file sharing service you didn't expect. This is where the tool Activity Monitor can help you discover what is running.

I would focus on these two points!

crwdns2934271:0Mud 3, 2022crwdnd2934271:0 Dan crwdne2934271:0

Hi @danj , thanks again for the reply.

We applied some more thermal paste and cleaned out McAfee Total Protection and some other Launch Agents and old preference files and seems a bit better. Hasn't revved up as much. But there seems a delay also in when the charging cable it recognized at times when plugged in.

The hard drive space is around 24-25gb off 256gb I think.

Ill have a look more at Activity Monitor and do a malware scan.

Thank you

Leigh

crwdns2934271:0Mud 4, 2022crwdnd2934271:0 Tattwa crwdne2934271:0

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Retina MacBook 2015

High CPU temp / Max Fans Intermittent after battery & keyboard replace

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