Genuine Lenovo ThinkPad System Mainboard (BDPLANAR Replacement Suite)
AMD Ryzen 7 Pro 4750U Octa-Core Enterprise CPU 🟢 Part Number: 5B20W77600 / 5B21U14157🚀 TRUSTED US-BASED SELLER 🟢 FAST 1-DAY HANDLING TIME🟢 Proudly USA Sourced: This item ships directly from our secure warehouse facility within the United States. No long overseas customs holdups, no international routing bottlenecks, and seamless domestic communication.
🟢 Fast 1-Day Handling Turnaround: Packaged with professional care and dispatched to the carrier transit network within 1 business day of cleared payment. Real-time tracking numbers uploaded instantly.
🟢 USA Shipping: 100% Free standard tracking shipping anywhere across the United States via USPS Ground Advantage or alternate tracked ground paths.
🟢 Logistics Safety: Protected inside its genuine Lenovo packaging and wrapped heavily in a premium anti-static ESD shielding bag to survive transit impacts cleanly.
🟢 Global Availability: International transit is supported to select eligible regions via the secure International Shipping program. (Please check the exclusions tab for country eligibility verification).📋 ENTERPRISE SYSTEM PERFORMANCE HIGHLIGHTSThis genuine, authentic Lenovo factory replacement high-performance system mainboard features an integrated AMD Ryzen Pro processor architecture, perfect for direct laptop hardware restoration.🔵 Integrated Processor Core: AMD Ryzen 7 Pro 4750U (1.80 GHz Base Clock, Up to 4.10 GHz Max Boost, 8 Cores / 16 Threads, 8MB L3 Cache). Includes integrated AMD PRO security and enterprise manageability technologies.
🔵 Graphics Architecture Engine: Integrated AMD Radeon Graphics (7 Core, 1600 MHz pipeline array).
🔵 Memory Infrastructure Layout: Memory architecture features integrated SO-DIMM expansion tracks designed to fit native DDR4-3200 RAM modules cleanly.
🔵 On-Board Protection Layer: Hardware-based AMD PRO Security Guard and discrete yTPM 2.0 (Trusted Platform Module) cryptographic chip embedded natively.🔄 OFFICIAL FACTORY CROSS-COMPATIBILITY LEDGERThis factory service unit is a direct, drop-in engineering substitution for any laptop utilizing a board marked with ANY of the following specific AMD Ryzen 7 Pro 4750U Part Numbers (MPNs) or board manufacturing lines:● Lenovo Primary Sourced FRU/MPN: 5B20W77600
● Lenovo Secondary Alternate MPN: 5B21U14157
● Factory Text Line Match: Lenovo BDPLANAR R7 PRO 4750U WIN,YD,YT,dT,yAB Series⚠️ STRICT BUYER FITMENT VERIFICATION DISCLAIMER🔴 MACHINE TYPE VERIFICATION: This board matches and fits ONLY the first-generation 14-inch ThinkPad L14 Gen 1 (Chassis Type: 20U5, 20U6) and 15-inch ThinkPad L15 Gen 1 (Chassis Type: 20U7, 20U8) laptops. It WILL NOT fit into Intel-architecture chassis setups or Gen 2 / Gen 3 layout variations.
🔴 BUYER RESPONSIBILITY: It is the absolute responsibility of the buyer to ensure they are ordering the exact matching component for their specific system footprint prior to checking out.
🔴 COOLING MATRIX WARNING: This is a native AMD-architecture blueprint layout. It will not accommodate Intel-based cooling fans, screw brackets, heat shields, or thermal pipes. Please audit your technical requirements or consult with a specialist prior to completing checkout.🛠️ HARDWARE WAREHOUSE & CONDITION NOTES:🟢 Lenovo Logistics Source: Sourced directly from professional tech fulfillment logistics as a clean, crisp, mint factory service replacement part. It is 100% brand new, completely unused, and has never been slotted into an active chassis.
🟢 Internal Packaging Integrity: Stored safely inside its genuine Lenovo cardboard shipping packaging container. The internal gray anti-static ESD shielding bag was opened strictly for quality control to capture clear photographs and document system serialization lines for safety.
🟢 Professional Installation Advised: Laptop mainboards are highly sensitive to electrostatic discharge (ESD). Installation by a certified PC hardware repair technician is strongly advised. User-inflicted static shorts, physical trace scratches, or bracket snaps void return privileges. Does not include a CMOS backup battery or outer cooling heatsink assemblies.🛡️ ANTI-FRAUD PROTECTION & RETURN AUDITING● Individual Mapping: High-resolution macro photographs of the specific board layout, silicon chips, and trace pathways are permanently cataloged in our secure fulfillment database prior to dispatch.
● Electronic Serial Tracking: The unique factory serial numbers, MAC addresses, and integrated hardware cryptographic chips of every unit are electronically scanned and mapped to your order transaction.
● Security Identifiers: Each unit is embedded with unique, permanent, invisible security identifiers applied to the multi-layer PCB substrate. Any evidence of component swapping or tampering voids returns.Important Item Specifics

• Brand: Lenovo
• MPN: 5B20W77600
• Substitute / Alternate MPN: 5B21U14157
• Compatible Product Line: Lenovo ThinkPad L14 Gen 1 (20U5, 20U6) / ThinkPad L15 Gen 1 (20U7, 20U8)
• Processor Brand / Model: AMD Ryzen 7 Pro 4750U Onboard
• On-Board Graphics Type: Integrated AMD Radeon Graphics
• Memory Slot Type: Open SO-DIMM Slots (Supports DDR4-3200 Modules)
• Processor Core Count: 8 Cores / 16 Threads (Octa-Core Architecture)
• Seller Location: United States (US-Based Seller)
• Handling Time: Fast 1 Business Day
• Features: AMD PRO Security Guard, Hardware yTPM 2.0 Encryption Array
• Condition: Open Box