Ir para o conteúdo principal

Model A1297 Unibody: Early 2009, Mid 2009, Mid 2010, Early 2011 & Late 2011

544 Perguntas Visualizar todos

Fans runs at maximum speed as I start the MacBook

Hi Folks!

I've got a problem that is turning me mad, and I passed the last 2 days searching for solutions.

A week ago I started to have the fans in my old macbookpro5.2 running at max speed.

I'm used to open it to clean it and to change components (HDs, ram, battery) and it's the first time I have this problem.

Just to avoid answers with things I already done, I try to be more specific I can.

Since several years I'm not using anymore the CD player, so I have a 2nd hdd instead.

Same thing for battery: several years I'm not using the original one.

Last change I've done: swapped out 2 SSDs and put SSD+HD (samsung 850 evo as primary disc and a 1TB hdd @7200 rpm for data).

The fans runs at maximum since I start the computer, so it's not a temperature issue (as I write below).

Until now I've done:

1) resetting both NVRAM AND SMC. The first time I've done the SMC I saw at the first reboot that keyboard lights blinked several times and then also the fans started at maximum, then slow down, then maximum, slow down a few times and after then they were always at maximum speed.

2) Detached the second hdd because I read somewhere that this could be an issue.

3) Already cleaned up all fans from dust

4) phisically detached and reconnected the battery, pressing 5 sec the power button to hard reset the SMC

5) detached the fans and reconnected

6) run the AHT (Apple Hardware Test): this gave me an error but I found out this is common if the battery is replaced (and resetting the SMC after the test hasn't lead to anywhere, I've got the same error).

7) run the ADVANCED test from AHT: almost 3 hours running to find always the exact same error code:

4SNS/1/40000000: TB3T-128.000

NOTE: only this error is found.

8) installed BOTH istatmenus and SMC fan controller, and with both, I can't control the fans. I've tried to make new adjustments but it was useless.

9) changed the SSD

10) tried to upgrade the SMD firmware but no need to upgrade anything.

I've tried hard to find a solution, also taken a look at your forum, but with no luck.

I've got no CPU usage, no new software, no strange sensor measurements, no battery issues.

I attach also a little screenshot of istatmenus sensors temperatures:

Block Image

https://s26.postimg.org/57t3uhzt5/Scherm...

I suspect a sensor failure, but where is it? I read there are more than 1 and it's not so clear where they are.

Another possible solution could be replacing thermal compound for cpu/gpu, but before disassemble all the machine I want to verify all the rest (and honestly I'm not convinced the problem is this).

I'd appreciate a lot your suggestions.

Machine:

MacBook Pro 17” Unibody early 2009

Model Name: MacBookPro5,2

Model A1297 (EMC 2272)

CPU: Intel Core 2 Duo @2,66 GHz

Cache L2: 6MB

RAM: 8 GB

SMC Version: 1,42f4

EDIT 1

from image posted I can see no Palm rest temperature is present. Could that be an issue?

Responder a esta pergunta Também tenho esse problema

Esta é uma boa pergunta?

Pontuação 1
2 comentários

Are you using any fan control software? Have you tried booting up on an external drive which has a clean OS (nothing else) what happens then?

Did you get your system wet or spill a drink into your system at some point?

por

Please refer to point 8)

Tried 2 and not working. The system is CLEAN: I installed it from scratch. Only VLC present by now.

No system wet/spills: I treat my computer very carefully.

Thank you! :)

por

Adicionar um comentário

1 resposta

Pergunta mais útil

If your Mac can't read a temperature sensor, it will make all the fans spin on full speed to protect the mac from overheating. So it is most likely it isn't getting reading on a sensor. There are multiple sensors in the MacBook: GPU, CPU, Disk, Battery, etc.

You could try to check which sensor is giving problems by using software that reads out the sensors of your MacBook, like TechTools Pro. If it can be fixed and the difficulty of the fix depends on the sensor that is causing the issue.

To mac the fans return to normal, you can use: MacFan Control, and then set the fans on: custom and select a sensor to react to. this way it will run normal speed, except when a set temperature is exceeded so your macbook won't overheat.

Hope this helps

Esta resposta foi útil?

Pontuação 1

1 comentário:

Thank you Rick, but if you read the post carefully, at point 8) I clearly stated that I have tried both istatmenus and smc fan control. Nothing worked: I can see the temperatures but not control the fans. Please refer to the image I posted.

por

Adicionar um comentário

Adicionar a sua resposta

Riccardo será eternamente grato(a).
Exibir estatísticas:

Últimas 24 horas: 1

Últimos 7 dias: 10

Últimos 30 dias: 27

Duração total: 5,186