MBP early2009 max fans speed

[RickyHunter]

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: 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.

I've tried hard to find a solution, also taken a look at ifixit forum, but with no luck.
I've got no CPU usage, no new software, no strange sensor measurements, no battery issue.
I attach also a little screenshot of istatmenus sensors temperatures.

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

 

[RickyHunter]

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: 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.

I've tried hard to find a solution, also taken a look at ifixit forum, but with no luck.
I've got no CPU usage, no new software, no strange sensor measurements, no battery issue.
I attach also a little screenshot of istatmenus sensors temperatures.
View attachment 745939
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

No one?

 

[Audit13]

Sounds to me like there could be a problem with the sensors on the logic board causing the fans to run at max speed all the time.

I had a Macbook air whose fans would spin at max speed from the time I press the power button until I turn it off. I took it to a local repair shop and he said the sensors needs to be replaced. He said he replaced them, along with a blown capacitor, and it's been fine for the past two months.

 

[RickyHunter]

Sounds to me like there could be a problem with the sensors on the logic board causing the fans to run at max speed all the time.

I had a Macbook air whose fans would spin at max speed from the time I press the power button until I turn it off. I took it to a local repair shop and he said the sensors needs to be replaced. He said he replaced them, along with a blown capacitor, and it's been fine for the past two months.

Thanks a lot! It's, I think, one of the two possibilities remained: sensors or thermal compound to be replaced. Do you know maybe where the hack are those "phantomatic" sensors? I don't find info about them anywhere...

 

[Audit13]

Unfortunately, I don't know where they are located in a macbook pro.

 

[RickyHunter]

Unfortunately, I don't know where they are located in a macbook pro.

Thank you, I'll keep on searching then, hoping someone will see this post

 

[RickyHunter]

UPDATE - Sorry for my late, I've forgotten to update you.
I brought the laptop to a technician (not at Apple) and he told me that is a problem with the wi-fi cable (that seems to be the same of the isight camera), so he solved installing mac fans control. At the moment it works ok for me.