VIZIO D48-D0 D-Series 48" Class Full Array LED Smart TV (Black) 1. VIZIO Internet Apps Plus - Instantly enjoy the latest hit movies, TV shows, music and even more premium apps straight from the Internet to your TV. Full-Array LED Backlight - Distributes LEDs behind the entire screen delivering superior light uniformity and picture performance. 2. 5 Active LED Zones - Dynamically adjusts the LED backlight per zone creating deeper, more pure black levels and higher contrast. Built-in Wi-Fi - Connect with high-speed wireless for easy, clutter-free access to VIZIO Internet Apps Plus. 3. Clear Action 240- Enhanced motion clarity with 120Hz effective refresh rate and powerful image processing for stunning sharp detail in sports and fast action scenes. 4. Troubleshooting - 1. Disconnect all devices and check for vertical lines using on-screen menus. 2. Reset the TV to factory settings using the built in on-screen menus. 3. Attempt to switch inputs and check to see if problem persists (e.x., HDMI-1, RGB, etc.)