NM-C121 Mainboard 5B20S41731 — Replacement Motherboard for S145-15IWL (CPU I38145U / I58265U)

Replacement laptop motherboard NM-C121, part number 5B20S41731, designed for use in S145-15IWL systems. This mainboard is compatible with CPUs I38145U and I58265U. Ideal as a direct swap for repairing or restoring an S145-15IWL unit — same mounting points and connector layout for straightforward installation.