Asus zenbook ux51vz (u500vz) with FAN stuck at full on 100%

Hi

This is my first post in the forum. I hope somebody can help me with my problem.

I have a ux51vz with water damage on the motherboard. I could not find a solution for it so I decided to get a replacement board. I got a replacement board from aliexpress and I was expecting to have a fully working board but it came with a problem with the FANs stuck all the time at 100%. They do not throttle or change velocity depending on temperature. FAN is full on at 100% speed and makes a horrible noise.

I've tested the FANs to rule out possible FAN malfunctions due to the water damage but they seem to work fine. both tachometer and PWM signals.
I've also tried to overwrite BIOS with original ASUS bios and winflash (bios UX51VZAAS203 and UX51VZAAS204) but neither did fix the problem.
I've also tried fancontrol software to see if I could at least change the speed manually but this didn't work either.

Looking at the schematics of the motherboard the PWM signal comes from the IT8517 controller and goes straight to the FAN with only a capacitor to gnd. No middle transistors or mosfets. There are two fans on this particular motherboard tied to different PWM pins on the IT8517 controller and both have the same problem.

So does anybody have seen this problem before in asus motherboards? Is there anything else I can try to make it work before I try to desolder and change the IT8517 controller?

Thanks

lacremacatalana ha scritto: I got a replacement board from aliexpress and I was expecting to have a fully working board but it came with a problem with the FANs stuck all the time at 100%.

You should ship this MB back to the seller and request for full refund, I think.

lacremacatalana ha scritto:Is there anything else I can try to make it work

You should clear ME Region on BIOS first (or request ME Region cleaning on DOCUMENTATION/BIOS REQUEST subforum) but this way you will loose a warranty.

Thanks Vogelek23 for the info.

I´m a bit reticent to send back the board and pay the shipping (I have to pay it) to get a new board with the same problem. It´s a big risk and at least now I have a working computer

I could try the clear ME Region, but I have no clue how to start with that.

Any body knows a good place/tutorial to get started?

Thanks again

lacremacatalana ha scritto:Any body knows a good place/tutorial to get started?

As I wrote before, you can dump your BIOS to the file and request ME Region cleaning in the proper forum.

Hi All

Vogelek23 ha scritto:As I wrote before, you can dump your BIOS to the file and request ME Region cleaning in the proper forum.

I want to create a dump of my BIOS, I've been searching the entire forum and googling around but I couldn't find any details on how to create a BIOS dump. Do I need an external programmer/reader and desolder the bios chip or is it something I can do via software?

It is an asus u500vz

I got a second broken laptop, same model than the one before (u500vz). Also with a broken motherboard. I ordered a second refurbished board from Aliexpress hoping that this time will be ok and it came also with the same problem. FANs are all time 100% ON. So I hope this can be fixed with a clear ME procedure. I just need to know how to do it and request it.

Thans for your help

I want to create a dump of my BIOS, I've been searching the entire forum and googling around but I couldn't find any details on how to create a BIOS dump. Do I need an external programmer/reader and desolder the bios chip or is it something I can do via software?

You must have a bios programmer, such as TL866.
You need to desoldering the bios chip, and read it in the programmer.