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Try the long push bar on top; it varies the display brightness including totally off.
Sorry, there was a problem. Please try again later.They messed up and did not give enough info. If using chromecast, and you just want laptop to TV, then ditch the Chromecast & get USB or USB-C to HDMI adapter. you then only have to make sure the laptop has not gone to "sleep" and change the "source" on the TV to the HDMI port you plugged into.
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