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Hi Toshiba Customer, thank you for your interest in the Toshiba 43C350KU. The television automatically displays the highest picture quality based on the source of the image. Please make sure your cable box is set to 4K. If you have any further questions or concerns, please give us a call at 1-888-407-0396 or email us at [email protected]. Thanks again, Toshiba Support Team.
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