Samsung Q800T Series E-Manual page 175

If it does not turn on, make sure the power cable is properly connected to the device and to the wall outlet.
If it does not turn on, make sure the power cable is properly connected to the device and to the wall outlet.
Check the connection of the HDMI cable to your TV or One Connect Box.
HDMI IN
Power
One
Invisible
Connection
HDMI IN
One
Invisible
Connection
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HDMI IN