There's a Video 6 button on the unit, but not a regular Video button. Pressing this button (Video 6) with the Tone Defeat button for 5 seconds makes the entire display activate, but doesn't show any Reset message...?
O.K. Let's see...List the buttons on the lower front face from left to right. I had same thing on the T753. Illumination of all lighting in the display. I was able to figure it out.