Please test the drive with another USB cable. Is the drive correctly recognized when connected to a PC? Please open Disk Management and check the drive’s file format. The majority of the external drives come pre-formatted in NTFS, but some phones and TVs use only FAT32. So, I would recommend you to backup all data and format the drive in FAT32 and try to connect it again to your TV. If the issue persists, contact the drive manufacturer’s support and request assistance.
If the drive does not appear in Disk Management, search for it in Device Manager, under USB devices. Uninstall it, restart the PC and plug the drive back in.