Based on the context of electronic components and replacement parts, **5H40** most commonly refers to a specific series of **Laptop CPU Cooling Fans** or **Heatsink Assemblies** used primarily in Lenovo ThinkPad and IdeaPad series. --- ### 1. Component Overview In the electronics industry, "5H40" is a prefix for Lenovo FRU (Field Replacement Unit) numbers. These are the mechanical and electromechanical parts responsible for thermal management in portable computers. ### 2. Technical Specifications While specifications vary by the specific model suffix (e.g., 5H40W36707), they generally share these characteristics: | Feature | Specification | | :--- | :--- | | **Component Type** | DC Brushless Fan / Heatsink Assembly | | **Input Voltage** | 5V DC | | **Current Rating** | Typically 0.25A to 0.50A | | **Connector** | 4-pin (PWM control for speed regulation) | | **Material** | Copper (heat pipes) and Aluminum (fins) | | **Bearing Type** | Fluid Dynamic Bearing (FDB) or Sleeve Bearing | ### 3. Common Applications These parts are designed for specific laptop architectures to ensure the CPU and GPU stay within safe operating temperatures. * **Lenovo ThinkPad Series:** Used in P15, T14, and X1 Carbon models. * **Lenovo IdeaPad/Legion:** Found in gaming variants where high-RPM fans are required for cooling high-performance chips. * **Yoga Series:** Slimmer versions of the 5H40 assembly designed for ultrabooks. ### 4. Anatomy of the Part A standard 5H40 assembly consists of three main electronic and mechanical sub-parts: 1. **The Fan (Actuator):** Controlled by the motherboard via Pulse Width Modulation (PWM) to adjust speed based on thermal sensors. 2. **Heat Pipes:** Vacuum-sealed copper tubes containing a small amount of liquid that vaporizes to transfer heat. 3. **Thermal Interface:** The base plate that makes contact with the silicon die, often requiring thermal paste (TIM). --- ### 5. Troubleshooting & Replacement If you are looking at a 5H40 part due to a hardware failure, look for these symptoms: * **"Fan Error" on boot:** Often indicates the 4-pin sensor is not sending a tachometer signal to the BIOS. * **Grinding Noise:** Indicates bearing failure within the fan motor. * **Thermal Throttling:** The CPU slows down because the 5H40 unit cannot dissipate heat effectively.