MSI GS66 CPU Fan turning on FULL SPEED for about 10 seconds, then pauses for 2 seconds, repeats

roland.153b02db

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Hey everyone, here's the issue

My MSI GS66 10SFS CPU fan is spinning at full speed for about 10 seconds, it pauses for 2-3 seconds, then spins again at full speed. The CPU temp is around 40-50C, so it's not overheating.
When I turn on the laptop, it starts with a slower RPM spin (for the same time, 10s spin, 2s down time), then it speeds up to about 40%, then maybe 80%, then 100%.
Dragon Center shows that the FAN 1 RPM is 0, even though the fan is basically spinning 100%. Dragon Center is however detecting the RPM for the two GPU fans just fine.

If I want to change the Fan intensity for the CPU FAN, all I can do is turn the fan on or off. If I go just 1% in the fan curve, the fan spins 100%.

I tried to do an EC Reset, tried EC version 111, 112 and 118, nothing worked.
I also removed the heatsink and tried one of the GPU fans in the same CPU FAN motherboard connector, the GPU fan also did exactly the same thing, so it is not a faulty FAN, because the same GPU FAN is working just fine in it's GPU port.
The same patter is also active in the BIOS, so it's likely no software in windows 10.
I also swapped back the original RAM, still same issue.

Here's the weirdest part. I opened the laptop and updated the RAM to 32GB and also repasted the CPU, GPU and all the other parts around. CPU and GPU temps have gone noticeably down on idle, but the fan is going crazy.
I did unplug the battery before changing the RAM or repasting, so could it be that there was something stored somewhere and it got deleted because of no power for a very long time?
I did NOT have any issues with the fan before opening the laptop. I don't know if it was the RAM change, the fact that I unplugged the battery or that I removed the heatsink (incl all fans) that caused this, but I 100% did not have this issue before doing any of that.

Please let me know if you have any ideas. Thank you for your time.

System Information
------------------
Serial Number: 9S716V112232ZK7000006 / 0016V1-232K2007000005
Product Name: GS66 Stealth 10SFS
OS: Microsoft Windows 11 Pro 64-bit Ver.2009(OS build 22621.2861)
HDI Build: ZS7-16V1RM4-IF1 / 10.TC4.G23.8.0.6
BIOS Version: E16V1IMS.112
BIOS Release Date: 2020/11/19
EC Version: 16V1EMS1.1110413202009:33:34
CPU: Intel(R) Core(TM) i9-10980HK CPU @ 2.40GHz
Memory: 32 GB @ 1600 MHz
- 16 GB, DDR4-3200, Kingston KF3200C20S4/16G
- 16 GB, DDR4-3200, Kingston KF3200C20S4/16G
Graphics: Intel(R) UHD Graphics, 1024 MB
Graphics: NVIDIA GeForce RTX 2070 Super with Max-Q Design, 8192 MB
VBIOS Version: 90.04.97.00.66
Drive: SSD, WDC PC SN730 SDBPNTY-1T00-1032, 953.87 GB
Network: TAP-NordVPN Windows Adapter V9
Network: Killer(R) Wi-Fi 6 AX1650i 160MHz Wireless Network Adapter (201NGW)
Network: Killer E3100X 2.5 Gigabit Ethernet Controller
Network: Bluetooth Device (Personal Area Network)
Win32 SHIFT mode: Unsupportive
Power Plan: Power Scheme GUID: a1841308-3541-4fab-bc81-f71556f20b4a (Power saver)
UWP User Scenario: User, Performance: Medium, Fan: Advanced
Graphic Switch: MSHybrid Graphics
 
Last edited:
Sounds like a problem with a faulty sensor on the motherboard. I guess (BIOS Release Date: 2020/11/19) warranty is over. You can send it to MSI. They change the board (expensiv).
Or if you know some guy which repairs laptops and has a good reputation then let him have a look. Maybe has a cheaper solution. If not you still can send it to MSI or another company.

By the way - this is a snippet from a German website which offers repairs. They want a lot of your money.

MSI GS66 Mainboard Laptop Reparatur​

  • Artikelnummer: 3471
  • Kategorie: MSI
439,00 €
 
I did NOT have any issues with the fan before opening the laptop. I don't know if it was the RAM change.
> You can try to change the original RAM back to recheck. If you still have the same problem, you should send the laptop to the service center for repair. It seems it was damaged somehow while you were changing the memory.
 
From another forum:
"With a CPU-Temp-Sensor, the Signal it produces is calculated by the CPU in it's built-in Firmware,
then the CPU generates a PWM signal which drives the Fan's PWM-Input-Pin." This would suggest some CPU damage however Your laptop is working. For repasting I was also removing bios battery. The mainboard was without power for an hour. You can try that.
 
I did NOT have any issues with the fan before opening the laptop. I don't know if it was the RAM change.
> You can try to change the original RAM back to recheck. If you still have the same problem, you should send the laptop to the service center for repair. It seems it was damaged somehow while you were changing the memory.
I did try that. Didn't work. The fan was still not spinning correctly after I swapped back in the original RAM.
Also, I don't have any repair centers near and I really doubt this is a hardware issue, it's more like a software issue.
 
From another forum:
"With a CPU-Temp-Sensor, the Signal it produces is calculated by the CPU in it's built-in Firmware,
then the CPU generates a PWM signal which drives the Fan's PWM-Input-Pin." This would suggest some CPU damage however Your laptop is working. For repasting I was also removing bios battery. The mainboard was without power for an hour. You can try that.
I tried removing the main laptop battery and power from my laptop overnight. That didn't work. But, I haven't tried removing the BIOS battery. I'll try that as well
 
UPDATE: As mentioned before, Dragon Center isn't detecting the RPM because it is 0 while the FAN is spinning 100% but I found out that if I stop the fan while it is in the 10s spinning cycle, then the fan will slow down not gradually, but in about 3-5 steps. It doesn't go from 100% to 0 right away.
Also, in Dragon Center, while the fan is slowing down, the RPM suddenly reads 1882 RPM for a brief second, then it goes back to 0.

Is there any reasonably simple way to access the EC and see if the laptop can read the fan RPM?
Can anyone who has an MSI GS66 10SFS take a high quality picture of the CPU FAN and the PCB? I would like to at least visually compare my board with a working board. Maybe while cleaning the board, I accidentally removed a component that was important for the fan controll (Very unlikely, but I have no other ideas at this point)
 
It seems that the spinning behavior for the CPU fan and the information shown under the Dragon Center was incorrect.
Try to perform the EC reset and clean insatll the Dragon Center before having the laptop back to MSI Service for the further check.
 
I've done EC reset multiple times and also I have installed different EC Firmware, which also resets the EC. I have also reinstalled Dragon Center.
Keep in mind, I did not have this issue before opening the laptop.
And the fans spin in the same pattern even when in the BIOS so I don't think it's related to the operating system but I'm not sure on this one.
 
I've done EC reset multiple times and also I have installed different EC Firmware, which also resets the EC. I have also reinstalled Dragon Center.
Keep in mind, I did not have this issue before opening the laptop.
And the fans spin in the same pattern even when in the BIOS so I don't think it's related to the operating system but I'm not sure on this one.
The curve of the fan in BIOS mode is different from it in the Windows system, so they cannot be compared. It is recommended to send it to the service center for further inspection.
 
Sending the laptop to MSI service is impossible at this point for me.
But I still believe that this is a software issue, not a hardware issue. It's either a problem with Dragon Center or the EC.
It's just a bit difficult to believe that there are many people online who have the exact same issue and this hasn't yet been addressed by MSI. It's not like this laptop is cheap either...
The funny thing is, I had an MSI GS65 before I got the GS66 and it too had issues with the fan . The Fan would just spin from 0 to 100% for no reason and I couldn't control the FANs through Dragon Center while this was happening.
So I'm hoping that MSI is going to release a new v19 firmware update for the EC that is going to fix this.
 
You already have the answer, you did not have such issue before you disasseble the laptop to swap the RAM.
Having your laptop back to MSI service instead of waiting. DO NOT WASTE YOUR TIME.
 
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