Turn on again and screen flashes and goes dark. Sound and all else OK. Tried again for several hours same problem Next day works for about an hour as before then picture goes off. Picture flashes for a second or two when turned on again and then goes off.

Hold down the adjust button bottom right then press the mode button top left you will notice the a or p that stands for am/pm will disappear & reappear. If you have an a or p on your display then you are out of military time.

or

1. In TIME mode, press and hold SET/RECALL. Time zone will flash.
2. To set, push + or - to select first or second time zone.
3. Press NEXT. Hour digits flash.
4. Press + or - to change hour including AM/PM. (Scroll through 12 hours to get to AM/PM).
5. Press NEXT. Minute digits flash.
6. Press + or - to change minutes.
7. Press NEXT. Second digits flash.
8. Press + or - to set seconds to zero.
9. Press NEXT. Day of week flashes.
10. Press + to - to change day.
11. Continue pattern to set month, day of month, 12-hour or 24-hour time display, MM.DD or
DD.MM date format, turn hourly CHIME on/off, turn BEEP on/off. If you select BEEP on, a
beep will sound every time you push a button (except INDIGLO).
12. Press DONE to confirm and exit or NEXT to continue and set second time zone, if desired.

17 Earth days or 12 Forex days time using a 24 hour clock.

Common problem, there is a headlight relay in the power distribution center under the hood that needs changed out.

Found a solution at

www.reviewcentre.com/vt100228_start50_orderasc.html

Short out the dark blue and the dark brown wires that lead into the temp control dial. Everything now works. This bipasses a dodgy thermister or something. Of course this might not solve all similar problems but it does seem a common fault.

Try this:
1) turn on the TV
2) from the remote control press MENU 2,4,7,0 then ENTER
3) tv will state on screen that it is INITIALIZING
4) when done press the front reset button.
5) should be good to go!

You might have to replace that screen. I'm sharing from experience too.

Please don't forget to rate this

> IF IT WASNT DIGITAL HD I WOULD HAVE SUSPECTED HIGH VOLTAGE POWER SUPPLY BUT THAT DOES NOT EXIST HERE.
Well, not completely true; the fluorescent backlight is still a high voltage device, even if only hundreds of volts instead of kilovolts, and either the lamp(s) or the power supply for it (them) is causing the dropout of your picture. When it does it next time, look at the screen from various angles, I think you will see that video content is still there.  

3 years ago, i had the same problem with a samsung 36", when i switched it on it would stay on for around half an hour, i tried to switch on straight away, but it wouldnt, i had to leave it for an hour or so, then it would stay on for about 5 minutes. And the same thing the next day (half an hour then 5 minutes). I left it into the repair shop, it had to get a circuit board replaced at a cost of £315, dont know how much it will cost to get fixed now, as i could buy the same tv for a little over that now.

I tried the fan idea to cool it and it didn't work.

Have u tried re-installing the video drivers?