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How to Screencast to a Roku TV from a Chromebook? To screencast from a Chromebook to a Roku TV, you want to utilize the underlying "Cast" highlight in ChromeOS, which basically reflects your Chromebook screen to your Roku by dealing with it like a Chromecast gadget: open the website page or application you need to project, click the "Cast" symbol in the location bar, select your Roku tv from the rundown of accessible gadgets, and begin projecting; guarantee your Chromebook and Roku are associated with a similar Wi-Fi organization.