5B21L44883 Lenovo R7-7840H RTX 4060 8GB WIN RM System Board Motherboard Mainboard Logic Board Assembly Replacement Component Part

5B21L44883 Lenovo Laptop System Board Ryzen 7 7840H RTX 4060 Tested

Restore full computing and gaming performance to your laptop with this main logic board assembly pulled from a clean working environment. Official Lenovo system board featuring the high-performance AMD Ryzen 7 7840H processor and dedicated NVIDIA GeForce RTX 4060 8GB graphics chipset. Engine-tested to ensure stable power delivery, multi-core CPU stress handling, discrete GPU benchmarking, port connectivity, memory channel performance, and clean BIOS operation.

ITEM SPECIFICATIONS: 

Brand: Lenovo 

Main Part Number (MPN): 5B21L44883 

Processor Onboard: AMD Ryzen 7 7840H Graphics 

Processing Unit (GPU): NVIDIA GeForce RTX 4060 8GB Dedicated VRAM 

Form Factor: OEM Laptop Main Logic System Board

KEY FEATURES & HIGHLIGHTS: 

• Integrated AMD Ryzen 7 CPU and dedicated RTX 4060 graphics deliver powerful mobile workstation and gaming performance. 

• Direct drop-in OEM replacement mainboard eliminates complex component desoldering and board-level micro-soldering. 

• Onboard connector interfaces for display flex cables, keyboard backlighting, high-speed storage, power input, and peripheral I/O ports. 

• Ideal replacement solution for resolving liquid damage, POST failure, dead power rails, or severe GPU/CPU degradation.

WHAT IS INCLUDED: 

(1) Lenovo Laptop System Board with Ryzen 7 7840H and RTX 4060 (MPN: 5B21L44883)

QUALITY ASSURANCE & SHIPPING: 

Tested: Comprehensive diagnostic functional testing completed. Verified full POST boot cycle, Windows deployment stability, thermal stress performance, discrete GPU load benchmarks, audio jack handshake, and clean non-passcoded BIOS setup. 

Packaging: Encased in protective anti-static ESD shielding, wrapped in multi-layer heavy-duty bubble padding, and shipped securely in a reinforced rigid box engineered to prevent bending and impact damage during transit.

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🚚 Shipping

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Ships from the USA, usually within 1 business day.
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60-day free return/refund policy for all products (U.S. orders only).
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📸 Item Pictures
Pictures are for illustrative purposes only. The part pictured may not exactly match what you receive due to restocking. Compatibility info is provided as a courtesy and does not constitute a warranty. Always verify the part before ordering.