“The Chromecast Ultra puts a warning on the screen if it's plugged into my TV for power instead of the power adaptor. Does this Chromecast work in 4K without warnings when powered by a USB 3.0 5V 1A port?”
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If your TV has a USB 3 it will work, other wise it won't. USB 2 will give a wall outlet error, 1 -1.4 amp will give a boot loop, 1.5+ will work
Sorry, there was a problem. Please try again later.This Chromecast requires the use of its included power adaptor according to Google. (It's power adaptor is 5 Volt DC, 1.5 amp)
Sorry, there was a problem. Please try again later.Chromecast with Google TV requires a 5V DC 1.5A USB-C power supply. We recommend using the power adapter that came with it to get the best experience. You can learn more about the specifications for your Chromecast with Google TV here: https://support.google.com/chromecast/answer/3046409
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