To perform a hard reset on a Samsung TV without using the screen:

1. Unplug the TV from the power outlet completely.
2. Press and hold the physical power button on the TV itself (usually located on the right side or bottom right edge) for about 30 seconds.
3. While continuing to hold the power button, have someone plug the TV back into the power outlet.
4. Continue holding the button until you might hear a reboot sound or see a change in the power light indicator, which suggests the reset has been initiated.
5. Release the power button and press it once to turn the TV back on.

This method resets the TV's internal system without requiring screen interaction or a remote control, useful if the screen is black or the remote is missing.