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Unplug the tv. take off the back panel. vacuum or blow out the dust with a can of compressed air (@ $3 at Staples). A lot of the projection tvs had a thermal sensor which would turn the tv off if it got to hot.
That is also a good time to clean the lenses. Be careful not to move them out of alignment. My tv worked like new after I did those things.
Check the speaker/s. If found OK; check and replace the damaged component/s at its audio output section circuit board. If needy, replace this board as card basis. If you wish to get some details; check the site linked here. Pull up older posts. Search the site by type in the "brand name" to your device; in the "Search box at the top right of the display window of the Homepage" to get gathered related posts. http://electronicshelponline.blogspot.com/ The most probable cause is with its audio output IC itself; overheats.
I sent my question to the "solve your problem for free" on this website, so I was expecting some "free" advice. My finances are such that I can only ask for free advice. I did see someone who had a similar-sounding problem, and there was a mention of two possible main boards that would fix the problem. I was hoping to know which board would most likely fix my problem, since the TV is less than two years old. If I take it to a TV repair person, I want to have a fairly good idea how to fix it, and what would be the approximate cost, so I do not get ripped off.
I had a similar problem where my 61" Samsung DLP was turning itself off very frequently I had resolved to try replacing the bulb. I called a local TV repair place to see if they had my buld in stock. The guy I spoke to actually told me how to fix my problem! There is a little blue switch behind the bulb access door. The inside of the door has a little piece that presses the switch down. The switch is supposed to work correctly weather the switch is in the up or down position but samsung forgot to take expansion from heat into account. If the switch is held in the upper position by the door and the plastic expands to a certain point, it triggers the set to shut off. This does not occur of the switch is held in the lower position. What you need to do is take the access door off and put it back on by sliding it into position from above. That will hold the switch in the down position, eliminating the problem. My set has not **** itself off ever since.
i had prob where my sony would switch off for a few secs thenh come back on . The solution was in menu / tv settings / sleep timer . Go into that and make sure its set to off. there are opions for off , 5 min 20 min 30 min etc... mine was set to nothing just blank.