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Just replaced battery in my MBP and now my fans are running constantly

R

Ryjobe36

macrumors newbie
Original poster
Jun 6, 2020
18
2
I just replaced the battery in my MacBook Pro (model A1707, 15-inch, 2017, 2.8 ghz Quad Core Intel i7 16BG 2133Mhz LPDDR3). Everything went well, everything works just as before, but now my fans are running constantly (most likely draining my new battery much quicker than it should). I tried somethings/advice from the Apple Mac forum, but i think because it was non Apple repair the advice is terse. Those things being an "SMC" reset and a "PRAM" reset based on Apples Recommendations. Both methods were tried twice and both proved ineffective. Any one out here in Maclandia have any ideas what can be down or what may be causing this?

One thing to note it that there was an insane amount of dust built up inside the machine, which i spray canned out. So originally i thought my fans where just happy to be spinning so freely *in jest* But seriously maybe that has something to do with it?

Any advice /info helps!
 
Last edited:
Ran diagnostics and got this. Anyone know these codes and what it means?
1AC163F3-CBA9-4672-BB02-4C7CB1F1E2D9.jpeg
 
I remember replacing a hard drive on my iMac years ago and the fans going full blast. I used the Macs Fan Control to auto adjust the speed.
 
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Maybe you were too aggressive with the canned air and loosened a temperature sensor. Have you opened it back up and made sure all connections are seated properly?
 
rpmurray said:
Maybe you were too aggressive with the canned air and loosened a temperature sensor. Have you opened it back up and made sure all connections are seated properly?
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That’s very possible, it was suuuper dusty so I hit it quite a few times. Sadly I think those connections are under the motherboard..? I did open it back up just a bit ago because another thread was talking about the fan connections not being seating correctly, that’s when I realized the fans stayed in when the motherboard came out. So the connections must be down there too. I’m not ready to take it all the way back apart. Do you know where exactly the temp sensor lives?
 
brandoman said:
I remember replacing a hard drive on my iMac years ago and the fans going full blast. I used the Macs Fan Control to auto adjust the speed.
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I downloaded it and it looked promising, but its not able to change the left fan to match the right, even tho there is now a custom setting on it
 

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Quackers said:
Could you have blown dust into the fans?
I think you need to take another look in there.
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Yes i very easily could have blown dust deeper in. If i were to open it, what would i be looking for? [I have enough technical skill and steady hand to follow directions and replace a battery] but i have no understanding what i would be chasing if i were to open it and look again. a sensor? dust balls jammed in there? (i already looked and cant see the fan connector cables without removing the motherboard again)
 
Ryjobe36 said:
Yes i very easily could have blown dust deeper in. If i were to open it, what would i be looking for? [I have enough technical skill and steady hand to follow directions and replace a battery] but i have no understanding what i would be chasing if i were to open it and look again. a sensor? dust balls jammed in there? (i already looked and cant see the fan connector cables without removing the motherboard again)
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Me neither to be honest. If you have all the tools you could look up the how-to's on iFixit. There'll probably be a teardown of your model on there.
Take your time and be careful and first of all disconnect the battery connector carefully before you start anything. And ensure that the connector doesn't make contact again until you want it to :)
Maybe put something plastic and slim in between the connector and the plug.
 
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Quackers said:
jeff996 said:
Maybe test with old battery to see if fans run normally again.
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To do that I would have to take the entire thing back apart, and those batteries were completely toast. But it’s quickly becoming apparent that using forced air is the killer. An ifixit tutorial stated one should only use a brush, and because of how much dust I found when I opened it, I blew the s@&$ out of that thing trying to get every last bit out. I see that is what did the damage. Replacing the fan is the same as the battery “everything must go”! Kinda deal. So I’ll just replace the fan. It’s only the left. Right is still in fine working order
 
Ryjobe36 said:
To do that I would have to take the entire thing back apart, and those batteries were completely toast. But it’s quickly becoming apparent that using forced air is the killer. An ifixit tutorial stated one should only use a brush, and because of how much dust I found when I opened it, I blew the s@&$ out of that thing trying to get every last bit out. I see that is what did the damage. Replacing the fan is the same as the battery “everything must go”! Kinda deal. So I’ll just replace the fan. It’s only the left. Right is still in fine working order
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As it's probably better to not use it for the moment you could take the fan out and see how things are. You can really blow the @=@! out of it if you're going to throw it away anyway :)
Check everything around where it fits too.
 
Quackers said:
As it's probably better to not use it for the moment you could take the fan out and see how things are. You can really blow the @=@! out of it if you're going to throw it away anyway :)
Check everything around where it fits too.
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Wait, so you think using it is not advisable until I fix/replace the one fan?
 
Quackers said:
I really don't know tbh. Is it usable at the moment? I don't know how much effect it would have. Maybe just keep an eye on the temps in the meantime.
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I thought it would “over-cool” things running so high like that, but as Apple Robert says:
Apple_Robert said:
I wouldn't, unless you want to risk frying the logic board etc. due to excessive heat.
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Maybe the power needed to run it that high is dangerous. It is tanking a full (brand new) battery in under 3hours. Oy! Whatta mess
 
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rpmurray said:
Maybe you were too aggressive with the canned air and loosened a temperature sensor. Have you opened it back up and made sure all connections are seated properly?
Click to expand...
Can you please tell me where the temp sensor is located in a 2017 MBP 15” Retina display w Touch Bar?
 
Quackers said:
I really don't know tbh. Is it usable at the moment? I don't know how much effect it would have. Maybe just keep an eye on the temps in the meantime.
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I just replaced Both fans with brand new one, and still the left fan is running 7000 rpms. Any secret wisdom you have that you haven’t already shared here? I’m banging my head on the wall
 
Ryjobe36 said:
I just replaced Both fans with brand new one, and still the left fan is running 7000 rpms. Any secret wisdom you have that you haven’t already shared here? I’m banging my head on the wall
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Sorry but I'm afraid not. Maybe a sensor has gone down but that would need to be checked and a diagnostic check should catch that, you would think.
See what others have to say but it's possible you'll need professional help.
 
You said it was really dusty inside. Is there any evidence of spilt liquid inside? That was the cause of this occurring for one person :-( He spilt a drink on one of the USB ports and it caused the fan to run incessantly.
 
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