Strange loud fan noise immediately after replacing the fans (Lenovo Legion 5 Pro)
I have a Lenovo Legion 5 Pro 16ACH6H (Ryzen 5 5600H, RTX 3060).
I recently had both laptop fans replaced at a repair shop. I have been using this laptop for about 3 years, and I had never noticed this kind of fan noise or behavior before the fans were replaced.
Now, the fans suddenly start spinning with a noticeable buzzing sound and a strong airflow for a couple of seconds. Then they become quieter or stop completely. A few seconds later, the same thing may happen again. This can happen when the laptop is idle. When I’m playing a game, the fans make this weird buzzing sound when they first start spinning, and then they continue running normally as they should.
I took the laptop back to the repair shop, and they told me that the fans turning on and off like this is normal. I understand that fans can turn on and off depending on the temperature, but I'm concerned about the buzzing sound and the way they suddenly ramp up and stop.
I've attached a video so you can hear the sound.
For those who own a Legion 5 Pro or have experience with laptop fans: does this sound and behavior seem normal, or could there be an issue with the new fans or their installation?