It sounds like the over load protection is kicking on. This could be for several reasons.
Unplug your tv for several minutes and try again. If problem persist get it serviced.
SOURCE: My 10 year old 55 inch Mitsubishi rear projection shuts off.
The main board/switch is worn to the point it will not work anymore after a while, I been in the business for years, These are wonderful TV's, yes there are replacement parts but a quick fix your looking for here will be unsuccessful this is the reason I am providing my advice and take a chance on the rating your going to give me. Try www.ebay.com look for people that is saling parts for these TV's.
Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/edwy_1a56970cf1ea4620
SOURCE: sony wega 55 inch tv turns on fine but after one
This kind of problem occurs when lamp becomes weak that means near to end of working life hours but still not dead nor broken.
Replacement of lamp in tv will solve your problem, lamp replacement procedure is easy and would be written in user manual.
Thanks.
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SOURCE: sanyo 50 inch plasma tv won't turn on. a couple of
its your main internal power supply board
SOURCE: My Hitachi 55 inch rear
Depending on how long you've had your T.V, these problems are usually lamp related.
http://cgi.ebay.com/Philips-Lamp-Hitachi-UX21511-50V500-50VX500-60V500-/380212608235?pt=LH_DefaultDomain_0&hash=item58866ffceb
Open the lamp door and inspect the lamp in the housing to see if it looks bad.
SOURCE: philips 55 inch tv weirdness
If it is turning off by itself then your power supply might be going out. If it does not bother you too much right now I would wait until it gets worst. Depending on how much you use it it may not get worst in months.
You can get parts at www.interliquidparts.com
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