Cooling fan spinning slow

[smtrejo]

I have an old HP Pavilion DV7, the cooling fan used to spin very fast (like if it was racing) specially when gaming. Lately, the fan started to run slow even on temps above 90C. These are the things I've already done:

- Checked the BIOS for "Fan always on".
- Flashed latest BIOS.
- Roolled-back to previous versions of BIOS.
- Tried SpeedFan but it doesn't supports my system.
- Hardware reset removing the battery and pressing the power button for 15 secs.
- Raised the bottom for better airflow, which actually helped and reduced temp by 10C, but didn't solve the fan problem.
- Opened the laptop and cleaned the air vents, fan and heatsink.
- Did a Windows fresh install.
- As a last resort, yesterday I replaced the fan with a new one but same result. The old one looked in good condition.

The strange thing is that when I turn on the laptop, the fan initially spins very fast, then after the "Press F10 to enter BIOS..." message is displayed the fan slows down to a constant speed from which it will never return.

Could it be a temperature sensor? A damaged motherboard?

Sorry for this long sad story but I'm desperate and by the moment I'm unable to get another laptop/pc. My model is https/support.hp.com/us-en/document/c01631355

I appreciate your help.

 

[webworkings]

You may well just need a new fan. They go over time. It happens.

 

[TheWookieWay]

You may well just need a new fan. They go over time. It happens.

OP clearly said he already did that, no change.

"- As a last resort, yesterday I replaced the fan with a new one but same result. The old one looked in good condition."

 

[webworkings]

Apologies, I missed that line.

I am wondering then if it is a power issue. You might want to consider testing how much power is going to the fan and when. If not that a sensor is possible as well, but then I would start to wonder if the motherboard is having issues.

 

[Daskwer]

At first, I didn't want to spend money on air conditioning and used only a manual fan. But then I began to need it, and I bought a good air conditioner. I've never regretted it.

 

[Wolfshadw]

Thread is almost four years old.

Closing
Wolfshadw
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