Also to know is, should I turn off my set top box?
If it is a regular box, go ahead and turn it off. Nothing gained at all be leaving it on. If it is a DVR, it is best to leave it on. If it is off and it comes on for a scheduled recording, it will come on with the audio muted.
Furthermore, why won't my FIOS TV turn off? If you are trying to turn off TV by turning off Fios box, or trying to turn off box by turning off TV you need to have CEC, or device control enabled on BOTH devices, and they need to be hooked up with HDMI cable. I believe it is listed as TV input control in the Fios menu under TV settings.
Also to know is, how do you stop the press menu to watch Fios TV otherwise turn off your TV?
on our stboxes we CAN turn this off w your fios remote go to menu/settings/set-top box/screen saver it behaves like this: with it set to "no screen saver in standby"
How do I turn off sleep mode on FIOS?
If you have VMS/IP boxes then on your remote hit Menu/Settings/System/Media Server Settings or Media Client Settings/Auto Power Off and set to None. Menu/Settings/System/Set-Top Box/Sleep Timer and set to Never.