Samsung The Serif 108 cm E-Manual page 153

HDMI 입력
HDMI 입력 HDMI 입력
First disconnect and reconnect the power cables and HDMI cables on the back of your TV or the One Connect (OC)
Box. And then unplug the power cord and plug it back into the wall outlet.
HDMI
If the external device support 4K UHD or 8K UHD videos, use a dedicated HDMI cable for each resolution.
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