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Only one fan works properly

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HP Pavilion Power cb028nl
Microsoft Windows 10 (64-bit)

My HP Pavilion Power cb028nl has only one fan out of the two working properly. While playing videogames the laptop is very hot, I thought it might be because the ram wasn't enough, so I installed an extra 8gb ram and nothing changed. 

When I opened the laptop to install the extra ram I saw only one of the two fans was dirty (my laptop is a year and a half old), I got suspicious and installed "speedfan" to check. One of the fans reaches up to 4800 rpm while gaming, the other is stuck at 99rpm. When the laptop is on and the only thing running is chrome the first fan runs at 3400 rpm, the second runs at 140. 

The bios is up to date (updated two days ago).

The vents have been cleaned.

I removed almost all startup apps (checked first which ones I could turn off safely).

There are no corrupt processes in windows task manager.

Power save settings are set.

Can anyone help me figure out if this is a software problem or a hardware problem?

Thank you in advance.


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Fans are controlled by heat sensors. Fan speed high or low depending that area is hot or cooler. From my view, this is a good design actually.


Hope this makes sense.



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Yes, it would be a great design, if it wasn't for its tendency to almost cause a meltdown.

After 1 hour of gaming there's no cooler area left, the laptop is burning hot and only one fan works. 

Yesterday my computer won't turn on, black screen, and there was a message about not being able to turn it on without causing damage because there was a problem in one of the fans (as soon as I turned it on I heard the fans running at maximum speed and then the laptop shut down automatically).

Could it be that one of the heat sensors died?


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