Samsung Q65B E-Manual page 142

Using Input Signal Plus
Menu Settings
Plus
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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 about the supported UHD resolutions, refer to "Supported Resolutions for UHD Input Signals".
For more information about the supported 8K resolutions, refer to "Resolutions for Input Signals supported by 8K models
(QN7**B Series or higher)".
Using HDMI black level
Menu Settings
Level
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Use HDMI Black Level to adjust the black level to compensate for low black levels, low contrast or dull colours
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.
All Settings Connection
Input Signal
function may not be available. In this case, turn off the
All Settings Connection
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External Device Manager
Plus, and then press the Select button to set the
Input Signal Plus
External Device Manager
Input Signal
function.
HDMI Black