Samsung UN55TU690TFXZA Manual page 72

Using Cable Box IP Remote
Settings General
Set the cable box that supports IP control to be controlled with Samsung remote control.
This function may not be supported depending on the model.
Using Input Signal Plus
Settings General
Expands the input signal range for HDMI connections.
When you select the HDMI connector you want to use for
Input Signal Plus function to On, the TV screen may flicker.
When you connect the TV to an external device that supports only the UHD 24 Hz or UHD 30 Hz frequency, or any FHD
frequency, the Input Signal Plus
For more information, refer to "Supported Resolutions for UHD Input Signals."
This function may not be supported depending on the model or geographical area.
Using HDMI Black Level
Settings General
Use HDMI Black Level to adjust the black level to compensate for low black levels, low contrast, or dull colors
generated by external devices connected to the TV via an HDMI cable.
This function is only available when the input signal connected to the TV via an HDMI connector is set to RGB444.
External Device Manager
External Device Manager
Input Signal
function may not be available. In this case, turn off the
External Device Manager
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Cable Box IP Remote
Input Signal Plus
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Plus, and then press the Select button to set the
Input Signal Plus
HDMI Black Level
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function.