Sometimes on Samsung tv remotes there are input buttons up the top (tv, video, etc. These allow you to control other devices they ARE NOT hdmi inputs like AV1 AV2 etc) ensure that TV Button is pressed immediately before power. It is easy to knock the buttons and choose an incorrect input. Failing this pull out and reinsert HDMI/rca. failing this 1. power cycle the device. If this doesn't work contact retailer/Samsung.
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