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I had this same problem. The Zenith rep told me to unplug the TV, hold the power button down for 30 seconds, plug it back in and then turn it on. It worked and I haven't had a problem with it since. I hope this helps. Good Luck!
I just found the solution on another model of Zenith TV. Hold the enter button down on the TV and the MUTE button on the remote. In approx. 5-7 seconds a screen will pop up asking if you want to reset the lamp timer. Hit the bullseye button in the middle of the arrows and it will reset. Worked perfectly.
It could be as simple as dust contamination in the LE or lcd chip. You need a clean room to work on this area of the unit and NOTHING you can do there would make that possible, short of spending a few thousand to build one. Before we added a clean room enviroment we simply pulled the LE and sent it in to PTS - who has one and reinstalled...
In your case take it to a qualified shop and you'll save yourself a lot of grief..