I've used this at multiple location devices before not sure why now it doesn't work and it's been probably 3 years now. I looked at other forum posts and turned on Wi-Fi, turned off mobile internet which almost seemed like it was going to work then for some reason it's not still not connecting after I typed in the code on the screen. Then the TV keeps flickering as if the device's wire is not connected properly, is it possible because I'm using a 3rd part USB cord to connect the power to the device?
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Thanks for reaching out. Let's sort this out.
A few questions: What's the LED light status in your Chromecast? How far is it from the Wi-Fi router? Are you getting any messages when connecting it to your network?
Give these steps a try:
Note: It's recommended to use the provided power cord and adapter that came with the Chromecast to avoid damaging the device and for it to work properly.