CPU heat sink detachment

[phillpower2]

The connectors seem to have different shapes. I would prefer not to risk damage as I am not an expert.

Fair comment.

You have two options as I see it;

Test the CPU fan header on the Mb with a multimeter and replace the CPU cooling fan itself.

Fwiw, I for one cannot explain why your CPU has not fried without an active CPU cooling fan drawing the heat away from the heatsink.

[Avtandil]

Fair comment.

You have two options as I see it;

Test the CPU fan header on the Mb with a multimeter and replace the CPU cooling fan itself.

Fwiw, I for one cannot explain why your CPU has not fried without an active CPU cooling fan drawing the heat away from the heatsink.

I had replaced the previous fan. No voltage is detected when the pc is running, but at the POST the CPU fan spins for a few seconds, probably as a test. Then it remains inactive. The component appears to be connected and powered correctly but for some reason it is set so as not to start up.

[phillpower2]

Then it remains inactive. The component appears to be connected and powered correctly but for some reason it is set so as not to start up.

That would suggest a BIOS issue be it a chip or a setting problem.

Have you tried restoring the MBs default factory BIOS settings.

Have you checked in the BIOS for what temperature the CPU cooling fan is meant to activate.

If you leave the PC off and disconnected from the mains are the time and date correct when you next power up the PC.

Can I ask that you do not quote every reply as we have to read the full post to make sure nothing gets missed, thanks.

[Avtandil]

That would suggest a BIOS issue be it a chip or a setting problem.

After factory reset the situation is unchanged. After turning the PC off disconnected from the mains and on again the time and date are correct. The bios does not contain options for setting the fans based on temperature. It only reports that the CPU fan speed is not available. Programs like Argus Monitor or SpeedFan do not find supported monitoring chips on the motherboard.

[phillpower2]

Do you see anywhere in the BIOS " BIOS Setup Utility Power menu " see attachment below;

[Avtandil]

Do you see anywhere in the BIOS " BIOS Setup Utility Power menu " see attachment below;

In the BIOS there is only fan monitoring. The CPU one has no data available. No other settings are available.
From the HP website I was finally able to update the BIOS and the Chipset drivers. Now the most recent (2023) ones are installed. Before, proceeding from “Device Manager” in Windows, it told me that the ones installed were the most recent, instead they were from 2019.
After the update the situation is unchanged, so it seems that the ordinary setting is with the fan off and that the Intel Pentium J5005 CPU type, with a very low TDP of 10W, is designed to dissipate little heat and can also work with passive cooling systems (heat sink only).
This site describes the configuration without a fan, link:

https://rkblog.dev/posts/pc-hardware/power-and-thermal-performance-fanless-pentium-j5005-pc/#:~:text=an%20annoying%20noise.-,The%20Pentium%20J5005%20is%20rated%20at%2010W%20T DP.,double%20what%20the%20CPU%20used.

Now I mounted the new fan on the CPU heat sink, keeping it detached from the fan header on the motherboard and connecting it to an external power supply that turns on when the devices are connected to the mains. This way it is always running without the need for temperature-based control.
I kept the old fan connected to the motherboard fan header to prevent the PC from being stopped during POST due to failure to detect the device.

[phillpower2]

it seems that the ordinary setting is with the fan off and that the Intel Pentium J5005 CPU type,

We were a bit slow on the uptake here in that we should have asked for the CPU details as opposed to trying to fix something that is not broken.

The reason why the fan does not spin up is because what you have is basically a notebook processor and they as you know do not have a standard desktop HS & cooling fan, this both the reason why the fan does not spin up and there is no cooling fan information/adjustment options in the BIOS.

What you have done is not required but in all fairness you can never have too much cooling, as long as it is quiet that is.

Fwiw, a different option would have been to use a 4 pin fan extension cable that you connect the stock 3 pin into and then the 4 pin connector on the other end you would plug into the 4 pin header on the MB.

[Avtandil]

What you have done is not required but in all fairness you can never have too much cooling, as long as it is quiet that is.

The fan has a nominal voltage of 12V but can also operate at 4.5, and at low RPM it’s very quiet.

[phillpower2]

Was actually referring to computers in general, you get people with more cooling fans than what is required asking why their computer is so noisy.

Unless there is anything else related to this you seem to have the matter in hand so if we don`t hear back from you we will mark and close your thread.

[Avtandil]

Unless there is anything else related to this you seem to have the matter in hand so if we don`t hear back from you we will mark and close your thread.

I agree, thanks for the support.

[phillpower2]

You are welcome and thank you for the follow up (y)