While wanting to watch Hulu on the computer connected to my TV I ran into the issue where every 5 minutes the TV would go into sleep mode. I was not able to find anything in KDE to prevent this from happening.
I did find a command that would allow you to set this option until XOrg was restarted.
# xset q
This will get you information about the keyboard, pointer, screen saver, colors, font path, and DPMS (which is what we want)
Keyboard Control: auto repeat: on key click percent: 0 LED mask: 00000002 XKB indicators: 00: Caps Lock: off 01: Num Lock: on 02: Scroll Lock: off 03: Compose: off 04: Kana: off 05: Sleep: off 06: Suspend: off 07: Mute: off 08: Misc: off 09: Mail: off 10: Charging: off 11: Shift Lock: off 12: Group 2: off 13: Mouse Keys: off auto repeat delay: 250 repeat rate: 30 auto repeating keys: 00ffffffdffffbbf fadfffefffedffff 9fffffffffffffff fff7ffffffffffff bell percent: 50 bell pitch: 400 bell duration: 100 Pointer Control: acceleration: 45/10 threshold: 4 Screen Saver: prefer blanking: yes allow exposures: yes timeout: 0 cycle: 600 Colors: default colormap: 0x20 BlackPixel: 0x0 WhitePixel: 0xffffff Font Path: catalogue:/etc/X11/fontpath.d,built-ins DPMS (Energy Star): Standby: 300 Suspend: 600 Off: 900 DPMS is Enabled Monitor is On
To keep the monitor from turning off or anything run the following command as root:
xset dpms 0 0 0