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This NS-A561 multifunctional side IO board is a direct OEM substitute for damaged original power/USB sub-board on Lenovo ThinkPad E550/E555/E560/E565 laptops. It combines DC power input socket, high-speed USB3.0 interface and power boot button into a single circuit board to resolve common faults like loose DC jack, unrecognized USB port and inability to power on, widely used for laptop after-sales maintenance and component upgrade.