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To me it sounds like a power supply board problem...some componet is breaking down intermitly ...that is a hard problem to fix, finding the board should be easy, but buying the board, replacing it, and still the posibily it be something else is really difficult..
When my TV did this in the past it ended up being the color wheel. I had someone replace it and it worked fine. I asked it if had to be calibrated after it is installed and he said no. Also make sure the door switch is pushed down when you install the back bulb door. Sometimes this switch can go bad as well.
The lamp needs to be replaced. It's on the back and easy to do. I replaced mine about 3 months ago and it was about $182.00. Hope this works, I know it's hard to fork out that kind of money at this time but once you do the TV will be as good as new. Take care
those tvs will try 3 times before completely shutting down. you can try and take the back off and check CP150 it is a large capactior located near the middle of the board on the left hand side(looking from back) if it looks and feels like the top is vented or puffed out then that could be the problem. if not i suggest having a qualifiedservice tech take a lookbecause there are too many things that could be the root cause.
I have the same TV and just replaced the same lampTY-LA1000.
You have to reset the clock that times the lamp.Hold down the volume button(first you turn on the TV) while holding down the PiP button or the swap Button on the remote. that fixed mine.
Sounds like the lamp to me. The projection lamps get hotter as
they age and the TVs have a sensor to monitor the temp and shutdown the
TV if it get too high
Projection TV makers charge an arm and a leg for their replacement
lamps. They make it easy to do but as a result the custom lamp
assy is expensive. The trick is to buy just the bulb for your
model TV from any number of us aftermarket sources at a fraction of the
lamp price and install it in the old lamp yourself. Really