I had the same problem with mine. I took the lamp out, comes out from
the front, and cleaned the screens on the top and bottom of the lamp.
If these are dirty, mine were, they are preventing the bulb from
dissipating heat. This causes the tv to shut off the lamp to cool it
down. Mine works like a champ now.
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It may be overheating.
Check the vents in the back to see if they are clogged.clean out any dust or lint. Alum if necessary make sure there is room for airflow around vents . Check to make sure blower fan is operating correctly.
Hope this helps.
Yes, cooling fan could be a problem. Just see whether it goes off during before shut off. If yes, the TV might need service. To know whether the fan goes off first or the TV, stick one side of any thin vibrating membrane such as a silver paper (like the one you see in cigarette packets) on the fan outlet, without blocking it, so that you can see whether it stops before the TV shuts down. Alternatively you can hand an inflated balloon which keeps flying off from the area of the fan and shall stop when the fan stops. I suggest this, in order to save your time looking at the rear all the time until the TV stops. Even then, one is likely to overlook whether the fan stops or TV stops first.
The memory buffer of the image processor overheats and the data in it gets corrupted.
Take your tv apart and clean it's interior very thoroughly, check the air vents for obstructions and the fans(if your tv has them). Finally after you reassemble it, make sure it's in a position that allows a good air flow for cooling.
The repair man just left my house for the EXACT same problem on the EXACT same model TV. All he had to do was remove the front panel on the TV and clean the bulb and fan. He said the bulb may have to be replaced before long but it is working perfectly now!! $100 service call to clean the bulb!
look in the back, see if the lamp is actually lit. If it is probably not a tv problem. If you can pull up the menu then you probably are on the wrong input. Are the fans running when you turn it on? IF fans are running might be lamp, if nothing is seen through the back.
I've had this same problem ongoing for a couple weeks. Finally, tonight it would shut off every 20-30 seconds, stay off for another 20-30 seconds then come back on. It turned out to be my bulb. I blew the TV out with compressed air, removed the bulb and disassembled it. Taking the bulb out of the plastic cage I then remove one of the metal screens at the top of the bulb, it just has little clips holding it in. I took a bottle of rubbing alcohol, some Q-tips and proceeded to clean the inside of the bulb through the screen hole. After cleaning the inside I put the screen back in, cleaned the outside of the bulb with a rag and alcohol, then reassembled everything. The TV is much brighter, I had to turn down the brightness setting and has been running the last few hours without an issue. You can avoid all this by buying a new bulb but I don't have the money right now to replace it and I'm cheap so I'll milk this bulb for everything it has. Heat kills bulbs so if you clean the screens and blow out the TV once every couple months you'll get a lot of life out of it..... I'm almost to 4 years on my original bulb and my TV is on constantly!! Good luck to all!!