Basically (out of the box) the Pioneer PDP-5080HD has a "No Operation Off" feature that will turn the set off after 3 hrs. Furthermore, a "No Signal Shut Off" feature will turn off the set after 5mins. I have the 5080 as well, with CABLECARD (a very faulty system you ask me), which the Pioneer does not recognize as a signal.
This being said, with the "No Signal Shut Off" feature enabled, it turns off on me too. I simply went into the menu (by pressing the "Home Menu" button, and went under "Power Control". There, there are three options from which to choose: Power Saving, No Signal Off, and No Operation off. I disabled the "No Signal Off" function on my set and everything seems to be panning out okay. If you find yourself not touching the TV remote for more than three hrs (e.g. a long baseball game or a movie), I would also disable the "No Operation Off" function.
I hope this helps, and please, if you have not done so already, refer to page 11 of the chat thread "Sony LCD or Pioneer Plasma" to find optimal settings for your TV pre-ISF calibration (or not at all, if a professional calibration is not a viable option).
I have had the Pioneer PDP 5080 for about 8 months. The picture is fantastic, but it has an annoying habit of shutting off in the middle of movies, games, etc.
A sign appears in the lower right hand corner of the screen saying "Time Operation Off" with a countdown in minutes (5,4,3...) and then it goes black.
I simply turn it back on and resume my viewing, but does anyone have any idea as to why this happens?
FYI--I have it linked via HDMI to my Denon receiver and signal is from a Comcast DVR box (also HDMI through the receiver) There are no external heat sources to account for, nor any other inputs to the unit. It is wall mounted and plugged into a MonsterCable surge protector.
Thanks for your input,