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Maybe try turning off the menu setting for HDMI CEC (could be called Anynet+ in Samsung). This setting communicates with other devices hooked to your tv and could be recognizing your cable box (ect.) is on, so it turns itself back on.
Sorry, there was a problem. Please try again later.Hi Help, we understand your concerns with the TV. Please fill out the form on http://smsn.us/SamsungSupportUSA and our Social Media team will be happy to look into this. ^Rosi
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