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Do you have a Video Picture for a short time and soon after the picture drops out and the screen goes black?
If so, when the LCD gets warm/hot a Diode shorts out and the screen can shut down. If that is the case, you may need to replace the screen. A technician needs to test the circuit board to see if a short is occurring in that hardware as this could be another fault.
Sounds like a bad solder joint on the printed circuit board. Once it heats up then it no longer makes good contact and the monitor goes black until it cools down and makes contact again. You could resolder it if you knew where it was but monitors are dangerous to go playing around with as they can hold very high charges of electricity in their capacitors that are very dangerous. It's a throw away world. Go buy a new one.
i Have the same problem, this screen is used on the spare computer we have in a loft conversion and the room does get rather cold, Warming the screen up with a fan heater for a couple of minutes gets rid of the problem. When the fault occurs the buttons on the front to adjust the picture quality don't work they just turn off the monitor.
This is most probably cause by one or more Faulty Electrolytic Capacitors, I find these are the MOST commonest form of "Fault" in these LCD's TFT's units. I ususally simply replace "On Spec" all High Value Electros, in fact ALL Electro's are suspect and often I just "Shotgun" and replace 'em all. Usually fixes all problems. Always use High Temperature Caps.