Samsung UN55TU690TFXZA Manual page 146

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
Connect
Cable
HDMI IN
One
Connect
Cable
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HDMI IN