RepairPal Certified shops can diagnose and repair your 2006 INFINITI QX56. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
it may be the camera or just a wire connecting the screen to the camera....or best case scenario it may be a fuse....but keep in mind if you're not a professional you should leave all electrical work to a dealer because their work is insured