Flow x16 fans start spinning at max, then hard power off

[davorj]

I experience this very sporadically, when at idle, the fans will start to spin at their max (very audible, noisy), and then the laptop will shut down (hard power off). Pressing the power button will not start the laptop. One needs to press it for a long time, release, and then again, to make it start up.

Just today, after the fans started spinning and before power off, I noticed in GHelper that the fan speed was unrealistically high on all 3 fans (+5000000 RPM), and also the CPU temp was skyrocketing to 103°C (while in reality it is limited to 95°C). The laptop felt slow, as if the CPU was heavily downclocked. The laptop was cold to the touch.

Plain Win 11 with office software, latest BIOS (ASUS_GV601VI_314_BIOS_Update). No hardware upgrades or overclocking. Laptop is used mainly for CPU-intensive computations (work).

[ElectroStingz]

Hello,

This is probably overheating due to the liquid metal no longer making good contact between the CPU and heatsink. When this occurs there will be no heat transfer so the heatsink will stay cool whilst the CPU bakes and temps will rapidly rise to the point of hitting the critical limit. Your CPU if the i9-13900H is rated up to 100 degC max operating, critical temp is usually around 110 DegC < the point it will shutdown.

Considering this is around 2 years old you should get the heatsink removed and everything redone, liquid metal, thermal putty for the CPU, GPU and GPU memory... See how this goes first as it is likely the problem.

[davorj]

As stated, this happens when the laptop is idle, cold to the touch, and not under any load. This never happens during high CPU or GPU workloads.
I suspect a faulty sensor somewhere that randomly triggers a power off procedure in the firmware (EC?). I am posting this question on ASUS forum hoping to get some useful insight from the manufacturer having more knowledge about their product than you and me. Alas... 

[davorj]

I managed to take a screenshot in the few seconds after the fans start to spin up and before the laptop powers off. Here one sees that the CPU becomes heavily downclocked and the fan sensors shows unrealistic RPM. This is some undocumented EC in the laptop failing?

 I guess this is also related to my previous question about oscillating fans on the same laptop.