LattePanda Sigma Fan Died? A Noctua 92mm Repair Mod

Hi everyone!

Recently, the stock blower fan on my LattePanda Sigma started rattling and eventually failed. I couldn't find an original replacement part anywhere. Without active cooling, the CPU was hitting 100°C instantly and throttling hard.

Since I couldn't buy a replacement, I decided to upgrade it. I designed a 3D-printed bracket to mount a standard **Noctua NF-A9x14 PWM (92mm)** fan in a "Top-Down" configuration.

**The Results:**
* **CPU:** Idle ~55°C, Load ~93°C (Stable at 41W package power, no throttling).
* **NVMe SSDs:** Temps dropped to ~35°C (the airflow cools the whole PCB now).
* **Noise:** Silent.

**The Mod:**
It requires a 12V Noctua fan and splicing the proprietary 1.27mm connector from the old fan (I used 3M Scotchlok connectors, so no soldering was needed). I also tuned the BIOS curve to make it dead silent at idle.

**Files & Guide:**
* **3D Model (Printables):** https://www.printables.com/model/1531429-lattepanda-sigma-fan-repair-bracket-noctua-92mm-mo
* **Full Guide + BIOS Settings (GitHub):** https://github.com/chlebekzszynka/homelab/tree/main/hardware/lattepanda-sigma-cooling