Fans start and stop intermitently, possible temp sensor problem?

[FanGuy213]

Hello,

So I opened up my HP Envy x360 Convert (15-eu0014nf) because I had to change the hinges. During this process, I had to disconnect the display, webcam, some signal dongles I believe and whatnot.

After putting everything back together, I noticed the fans spin up to 100% at the beginning for a few seconds during boot then they turn off.

They will keep turning on intermitently every few seconds or so.

I have done a few stress tests raising the temp of my CPU and GPU to about 100 Celcius and the fans won't come on.

During HP Fan system test, the fans work properly, so I am assuming a temperature sensor is not working properly and that's why the fans do not activate?
I do have errors though during the fan test however I can't seem to find their exact meaning.

UBX000-AQFA01-GXGH5G-J5PW03
UBX000-AQFA01-GXGH5G-J5FJ03

"The test determined there was a problem with the fan speed of the processor 1 (same for 2)  and that it might need to be changed".

What I have tried so far:
- Updated bios
- Updated Windows (W11)
- Disconnected battery, CMOS reset
- Disconnected fans one by one to see if one will work properly without the other (the one connected will do the same thing, turning on and off intermitently)

From the media you can see that:
The fans behaviour (No grinding or any type of sound at all, fans can move freely and during boot and fan test, they spin with no issues)
CPU and GPU temps get very high during the stress tests and fans do not turn on
CPU skin temperature does not go above 20 C which may be the source of the problem?

Any ideas? Have I shorted the MOBO somehow during my little hinge replacement endeavour? I'm open for suggestions. Thanks in advance

Link to video of the fans behaviour:
https://streamable.com/03zr2n