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The Insignia™ USB to HDMI Adapter is designed to connect devices with a USB port to an HDMI display. However, your Samsung UN75JU7100FXZA TV's USB 3.0 port is primarily intended for media playback, firmware updates, and connecting peripherals like keyboards or external storage. It doesn't support video input through USB, which means you can't use it to connect your Roku via the USB port. To connect your Roku to your Samsung TV, you'll need to use one of the HDMI ports on the TV. If your TV doesn't have an available HDMI port, you might consider using an HDMI switch to expand the number of HDMI inputs. If you have any other questions or need further assistance, feel free to ask! -Ed | Insignia Support | https://www.bestbuy.com/site/brands/best-buy-brands/pcmcat1596746025285.c?id=pcmcat1596746025285
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