VN7-791G fan stuck on high speed when temps are low

allofmywatts

Preface: This is a solved issue, but may help anyone who comes across this bug in the future. I found a similar post in the forum, but there the solution was "fixed itself". Not very helpful.

 

Problem: Both GPU and CPU fans stuck on high speed while the internal temperatures are very low (~30C).

 

Solution: Reset the internal battery.

 

Symptoms: During the boot process the fans spool up, then calm down until windows starts up. Then stay at high RPM, even when manually overriding. The fans stay on high even when in the BIOS menu.

 

CPU, GPU, RAM and disk usage are all within normal idle values.

 

SpeedFan and MSI Afterburner both report the GPU and CPU temps to be around 30 degrees, which is lower than normal idle.

 

Using RW Everything, the Embedded Controller reports the following: 

 

0x93	0x94	0x95	0x96	0x97	0x98
84	7B	7C	04	7B	7C
left fan mode	desired speed	set speed	right fan mode	desired speed	set speed

 

Value 84 at 0x93 is certainly an error, as it should have either be 04(auto) or 14(manual). 

 

Using NoteBook FanControl and overriding the settings results in the fans rapidly speeding up and slowing down and the "desired speed" values flipping between FF (min) and 7B (moderately high). The 84 at 0x93 also turns to 94.

 

After resetting the battery idle temps rose back to ~45C and the fans return to normal idle speeds (F0/FF). They also properly spool up under load.

 

 

 

 

 

allofmywatts

Solution highlighted in OP. Reset the  internal battery.

allofmywatts

Solution highlighted in OP. Reset the  internal battery.

brummyfan2

Hi,

Thanks for posting this solution, it will be useful to others