5B21F28595 Lenovo ThinkPad E14 Gen 4 Motherboard i5-1235U 8GB RAM NM-E491 Tested
Direct replacement system mainboard for Lenovo ThinkPad E14 Gen 4 series laptops. Fully bench-tested pulled component featuring an onboard Intel Core i5-1235U processor and 8GB soldered DDR4 RAM. Designed to restore original system performance, power distribution, and board-level stability for teardowns and mainboard replacement projects.
ITEM SPECIFICATIONS:
Brand: Lenovo
Main Part Number (MPN): 5B21F28595
Alternate Part Numbers: 5B21F28596, NM-E491, SB21F28595, 21E3 MB
Compatible Models: Lenovo ThinkPad E14 Gen 4 (Type 21E3, 21E4 Series)
Component Type: Laptop Motherboard / System Board
Key Specifications: Onboard Intel Core i5-1235U Processor (up to 4.40GHz), Integrated Intel Iris Xe / UMA Graphics, 8GB Soldered RAM + 1x DDR4 SO-DIMM Slot, USB-C / Thunderbolt 4
KEY FEATURES & HIGHLIGHTS:
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Exact Fitment: Factory teardown component ensuring precise chassis alignment, thermal assembly fit, and full interface connector compatibility.
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Integrated Processing Power: Includes pre-installed 10th Gen Core i5-1235U CPU and 8GB onboard memory for direct drop-in repair installation.
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Thermally Tested Architecture: Bench-tested under load conditions to verify stable voltage delivery, heat transfer, and system boot operation.
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Core Repair Solution: Resolves cracked board traces, power delivery IC failures, no-post conditions, and system lockups.
WHAT IS INCLUDED:
(1) Lenovo ThinkPad E14 Gen 4 Laptop Motherboard (MPN 5B21F28595 - Intel i5-1235U, 8GB RAM)
QUALITY ASSURANCE & SHIPPING:
Tested: Bench-tested, diagnostic verified, and BIOS confirmed fully operational prior to inventory entry.
Packaging: Encased in anti-static ESD shielding bags with heavy-duty protective foam transit packaging.
