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Hello there, Joseph. Thank you for reaching out with your question about the 55UR9000PUA TV. We understand that you'd like your TV to automatically open to your cable input (HDMI3) when you turn it on, rather than the LG home page. To set your TV to automatically switch to HDMI3 when powering on, follow these steps: Press the Home button on your remote to open the LG Home Dashboard. Navigate to Settings > All Settings. Go to General and select Devices. Select HDMI Input Settings. Set HDMI3 as the default input. This should ensure that your TV switches directly to your Comcast cable input when you turn it on. If you continue to experience issues or need additional help, please send us a private message on Social Media @LGUSSupport, and our team will be more than happy to assist you further. We appreciate your patience. —Renzo
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