This device supports up to 4Kx2K resolutions @30 Hz with a color depth of 8 bits. If you are running a 4K resolution at a refresh rate higher than 30 Hz or a color depth higher than 8 bits, your display will appear blank.
To resolve this issue, you need to lower the resolution, refresh rate, or color depth, by completing any of the following:
Connect a display to OUT 1 that is only capable of 4K at 30 Hz with a color depth no higher than 8 bits.
Connect the least capable display to OUT 1.
Connect an additional display to your video source (for example, a video card in a computer) and use this display to reconfigure the display connected to OUT 1 to run at 30 Hz and 8 bits color depth (or lower).