Lenovo 5b21f38507 Mobile Planar Board Gaming Laptop

Product Description

The LENOVO 5b21f38507 is a mobile planar board — the main logic board — designed for a Lenovo Legion gaming laptop configured with an AMD Ryzen 7 6800H processor and an NVIDIA RTX 3070 Ti GPU with 8 GB of dedicated graphics memory. This board serves as the central hub for processor, memory, graphics, and I/O communication within the chassis. Installation is performed by qualified laptop repair technicians or depot service professionals and requires full system disassembly. Replacing this board restores full system function when the original has suffered electrical failure, physical damage, or component-level fault.

This planar board is sourced as a Lenovo OEM replacement part, matched to the specific hardware configuration of the Legion line laptop identified in the part number string. The R76800H designation confirms AMD Ryzen 7 6800H CPU integration, and the RTX3070Ti8G designation confirms the discrete graphics subsystem. This combination targets high-performance gaming and workstation-class mobile applications where integrated graphics are insufficient.

Key Features

• Integrated AMD Ryzen 7 6800H mobile processor platform
• NVIDIA RTX 3070 Ti discrete GPU with 8 GB dedicated VRAM
• OEM Lenovo replacement planar board for accurate hardware parity
• Designed for full chassis integration in Lenovo Legion gaming laptops
• Direct drop-in replacement restores original system performance profile

Compatibility

Designed as an OEM-style replacement planar board for Lenovo Legion gaming laptops equipped with the AMD Ryzen 7 6800H and NVIDIA RTX 3070 Ti 8 GB configuration. Confirm exact model and sub-model number against the original board before ordering, as planar boards are configuration-specific.

Installation Notes

Laptop planar board replacement is a depot-level repair performed by trained technicians familiar with Lenovo Legion chassis disassembly. Power down the system completely and disconnect the battery before any service work begins. Anti-static precautions are required throughout the procedure. Do not force connectors — ribbon cables, power rails, and I/O headers on mobile planar boards are fragile and position-specific.

Technical Specifications

• CPU Platform: AMD Ryzen 7 6800H
• Discrete GPU: NVIDIA RTX 3070 Ti
• Dedicated Graphics Memory: 8 GB
• Part Type: Mobile Planar Board (Main Logic Board)

Standard Information

• Brand: LENOVO
• Manufacturer Part Number: 5b21f38507