Lenovo 5b21h85881 Motherboard Intel Core I5-1235u 8GB

Product Description

The LENOVO 5b21h85881 is a replacement motherboard designed for Lenovo laptop systems. Based on the part number encoding, this board integrates an Intel Core i5-1235U processor with UMA (integrated) graphics and 8GB of onboard memory, configured for Windows operating environments. It is a factory-specification planar board intended for service technicians and repair professionals performing component-level laptop repairs. Installation requires disassembly of the host chassis and transfer of ancillary components such as thermal modules, I/O boards, and display cables.

This motherboard is suited for depot-level or bench repair of Lenovo consumer or commercial laptops in the MBC21DJ product family. The part designation includes a WW (worldwide) suffix, indicating it is a globally distributed service part. Repair technicians working on warranty or out-of-warranty Lenovo units will find this board applicable where the original planar has failed due to component failure, liquid damage, or power fault conditions.

Key Features

• Integrated Intel Core i5-1235U processor with UMA graphics
• 8GB onboard memory configuration
• Windows-compatible firmware and hardware configuration
• Worldwide (WW) distribution designation for broad regional applicability
• OEM Lenovo service part for planar board replacement

Compatibility

Designed as an OEM-style replacement planar board for Lenovo laptop systems within the MBC21DJ platform family requiring an Intel Core i5-1235U UMA configuration. Verify chassis model and sub-model against Lenovo service documentation before ordering.

Installation Notes

Motherboard replacement should be performed by a qualified electronics repair technician with experience in laptop disassembly. Disconnect all power sources, including the main battery and any CMOS coin cell, before beginning service. Follow Lenovo hardware maintenance manuals for correct torque and reassembly sequence for the specific chassis. Anti-static precautions and ESD-safe workstation practices are required when handling this component.

Technical Specifications

• Processor: Intel Core i5-1235U
• Graphics: UMA (Integrated)
• Memory: 8GB onboard
• OS Compatibility: Windows
• Distribution Region: Worldwide (WW)
• Part Classification: Planar Board (Motherboard)

Standard Information

• Brand: LENOVO
• Manufacturer Part Number: 5b21h85881