Pretty much true in my case. If you're having the same problem as I did, all you really have to do is move the wire connecting the fans to the motherboard away from components on your laptop.
My story here: https://forums.tomshardware.com/threads/why-is-my-gpu-fan-insane.3532974/post-21412825
It's a really dumb design flaw. Not ragging on ASUS at all, you can't really predict this is going to happen. Just seems like it's receiving either heat from components they're touching, or EMF interference from being so close.
Shouldn't take you more than 30 total minutes to fix it. Please let me know if this helps someone so that we can figure out whether or not I accidentally fixed something else isntead, haha.
This quote led to the answer.
Ignore every other software,utility, driver and BIOS speculation.
The problem with the fan is the wire connecting it. It is either caused by the connector not connected properly or some interference from the chip that the wire hangs over.
I looked up a video how to teardown the laptop. The GL703GE is very easy to work on. The video is here:
From that video, you can see below that the wire in the video is looped around a resistor or capacitor or something (some silver cylinder). It does NOT hang over the chip near the fan. My machine, and most other pics I have seen online, show the wire handing over the chip that is just under the person's baby finger in the picture below.
I looped my wire the way it shows in the picture, made sure it was connected (it already was), and the problem has never happened since.
I'm running window 10 and haven't had this issue. Does an update cause this problem?
Please kindly send your device to service center for further examination.
It is not about fan control. Thermal needs to be checked as well.