This is the official article for how to fix the problem with the 4k monitor on your Samsung Galaxy Note 4.
Here is the list of steps you need to follow to fix it:1.
Turn the monitor on 2.
Plug in the monitor into the wall outlet and turn the monitor off.
Power the monitor from the wall socket.
Set the monitor to the ‘on’ state.5.
Press the power button for 2 seconds.6.
The monitor will display the Samsung logo on the screen.7.
Hold down the power switch and the power indicator will turn red.8.
Once you are done, the Samsung Galaxy NOTE 4 should be set to the 4K resolution on the monitor.9.
Connect the monitor cable to the wall and disconnect the power cable from the back of the device.10.
Go to the Samsung Home screen, select Settings.11.
Select Display Settings.12.
On the Display tab, select the 4:4:4 panel on the left and choose 4K.
Close the Settings screen.14.
Now you can turn the Samsung Samsung Galaxy Notes 4 back to the normal screen resolution.