Problem with PWM fan stuck at 4200 RPM
Problem with PWM fan stuck at 4200 RPM
I recently purchased an Acer Aspire M5811 and it functions properly except for the CPU fan running nonstop at 4200 RPM. After reseating the CPU, reattaching the fan connector, and trying software controls, none worked. I confirmed the motherboard displayed accurate temperatures (~30°C). Testing Windows 7 and 10 gave consistent results. BIOS settings include a "smart fan" option, but toggling it doesn’t affect speed. After updating the BIOS, various RAM configurations didn’t change the issue. It’s frustrating that no matter what you do, the fan stays on high. Can someone assist?
Have you checked if the cpu fan cable is plugged the right way round on the fan header? Failing that, ehh probably a dodgy fan "shrug". It's also a business pc and they are just not meant to last lol. Also https://manualmachine.com/acer/aspirem58...er-manual/ Edited December 24, 2023 by Madmaximus01
I checked the manual, but nothing seemed very useful. I’m confident the device is wired correctly—I believe a loose fan connector would prevent accurate speed detection.
Verify the wires are positioned as far in as possible from the tiny connector. It’s possible the wire handling the PWM signal isn’t fully inside. The GPU is overheating—it seems it’s not attempting to cool itself. Edited December 24, 2023 by Madmaximus01
The issue started because of the fan, so I swapped it out for a standard one I had on hand, and it functions properly now.