Lenovo 5h41b77275 Heatsink Assembly Uma Thermal Griffin

Product Description

The LENOVO 5h41b77275 is a factory-replacement heatsink and thermal assembly designed for integrated graphics (UMA) configurations in the Griffin JT4C0 platform. The assembly manages processor heat dissipation in slim notebook systems, drawing heat away from the CPU die and routing it through the heat pipe to the exhaust fin stack. Licensed computer repair technicians and depot-level service technicians are the primary installers of this component. It is an OEM-specification part sourced directly from Lenovo's parts catalog, ensuring a dimensional and thermal match to the original build.

This thermal assembly is intended for UMA (unified memory architecture) laptop configurations within the Griffin JT4C0 system platform. It is not compatible with discrete GPU variants, which require a separate dual-pipe or multi-pipe thermal solution. Typical installation scenarios include fan-on-heatsink replacements after thermal failure, heat pipe damage, or delaminated copper contact surfaces causing elevated CPU temperatures and thermal throttling.

Key Features

• OEM-specification replacement heatsink and thermal assembly for the Griffin JT4C0 UMA platform
• Designed for integrated graphics configurations — not interchangeable with discrete GPU thermal assemblies
• Heat pipe construction transfers heat from the processor contact pad to the exhaust fin array
• Direct Lenovo part — ensures correct mounting hole pattern, screw boss locations, and fin stack clearance
• Drop-in fit eliminates the need for modification during installation

Compatibility

Designed as an OEM-style replacement thermal assembly for Lenovo notebook systems on the Griffin JT4C0 platform using a UMA (integrated graphics) configuration. No additional compatible model numbers were specified in the product data.

Installation Notes

Installation should be performed by a qualified computer repair technician. Power down the system completely and disconnect the battery before removing any thermal components. Clean the processor contact surface and apply a fresh, thin layer of thermal interface material before seating the new assembly — reusing degraded thermal paste will result in poor thermal contact. Follow the manufacturer-recommended screw tightening sequence in the service manual to ensure even clamping pressure across the processor die.

Technical Specifications

• Configuration: UMA (Integrated Graphics)
• Platform: Griffin JT4C0
• Assembly Type: Heatsink and Thermal Assembly (THT)

Standard Information

• Brand: LENOVO
• Manufacturer Part Number: 5h41b77275