SKU: QN70Q60BAFXZA Categories: 4K ULTRA HD TVs, 70" TVs, LED TVs, Q60 Series, QLED TVs, Samsung TVs, Smart TVs Description Everything on your screen is upgraded to 4K resolution by a powerful Quantum Processor.. If you’ve already tried the above steps, but still have the same problem, then restart your Samsung TV. Screen mirroring uses Wifi to connect your devices. Unless you have a different TV, try the next solution. Once your Samsung TV is fully rebooted, try using it again. It may fix your problem. You can try the other solutions mentioned above.