FOR NB3993 Laptop I/O Board — USB, Card Reader, Audio & RJ45 LAN

Replacement I/O board compatible with NB3993 laptops, combining USB port, card reader, audio circuitry and an RJ45 LAN connector in a single module. Designed to restore USB data access, card reader and audio functions as well as Ethernet networking when the original board is damaged or defective. Compact assembly matches NB3993 mounting and connection points for straightforward installation and reliable operation.