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I just experienced the exact same thing. The tv will shut off if it gets too hot, and a clogged air filter will make it too hot. My tv is still under warranty, but I watched the technician do it. He removed the front and back part of the tv. He got down to the bulb enclosure in the rear of the tv, which is where the filter is located. He used my dirt devil and a brush to clean out the filter and the whole general back of the exposed tv. The he put all the pieces back on the front and back of the tv. Hope that helps!
I feel bad for you having such problems with the vendor and the technician too.
The location of that filter could be a small window in the back cover itself. could be a plastic window to the left side of the unit and is only a piece of plastic poliuretane kind of black sponge about 5 by 3 inches size .
What im interested telling you about the shut down condition and is maybe even most important than where is the air filter (who is one of the more than ten posibilities why the tv goes to shut down.
if the air filter is totally obstructed i would give one of ten probabities of suspicious why the tv shuts down:
first because the tv's air duct is not really isolated. The fan can eat air by any side of the air filter base as i said if the filter is totally obstructing which is really extreme. besides maybe the other 2 fans could help to cool down the unit in that case scenario. In my experience Most time the air filter holds tons of dust but is not totally obstructing the air passing, and really some other problems are in the set.
This is the really critical to know: if any of those fans stopped or maybe any sensor is overheated or the lamp is coming to dead or who knows.. a diagnosis is needed for this symptom really common in DLP technology.
Seems to me you maybe experiencing a convergence issue rather than the color converter. (Don't know what he means by that for that I am an a tv repair technician).
If it is what I beleive it to be, you need and experience tech to do the work for you. It usually contains replacing two convergence IC packs along with some resistors and sometimes power supply parts. All wich requires good soldering work.