There are three ways for you fix Samsung with black screen of death, you can try to wipe the cache partition; perform the master reset and using a broken Android data extraction
Way 1: Wipe the cache partition
If the problem occurred after an update, then try to wipe the cache partition to delete the caches and be replaced with new ones. Here’s how…
Turn off your Galaxy Note 5.
Press and hold the following three buttons at the same time: Volume Up key, Home key, and Power key.
When the phone vibrates, release the Power key but continue to press and hold the Volume Up key and the Home key.
When the Android System Recovery screen appears, release the Volume Up and Home keys.
Press the Volume Down key to highlight ‘wipe cache partition.’
Press the Power key to select.
When the wipe cache partition is complete, ‘Reboot system now’ is highlighted.
Press the Power key to restart the device.
Way 2: Perform the master reset
Should the problem persists after wiping the cache partition, then you have no other option but to reset your phone. It might be a serious firmware issue and you need to have everything wiped off and build up your phone from scratch again.
Remove your Google account and disengage the screen locks to make sure you won’t trip the Factory Reset Protection (FRP).
Turn off your Samsung Galaxy Note 5.
Press and hold the Volume Up, Home and Power keys together.
When the device powers on and displays ‘Power on logo’, release all keys and the Android icon will appear on the screen.
Wait until the Android Recovery Screen appears after about 30 seconds.
Using the Volume Down key, highlight the option, ‘wipe data/factory reset’ and press the Power key to select it.
Press the Vol Down button again until the option ‘Yes — delete all user data’ is highlighted and then press the Power key to select it.
After the reset is complete, highlight ‘Reboot system now’ and hit the Power key to restart the phone.