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Press the the cursor key up followed by down and power the TV off with the remote or the TV itself. Please use the original remote for this. Unplug the TV for a few seconds...replug and power the TV on. The second thing to try...press the cursor key left followed by the right key. Power the the TV off with the remote or the TV itself. Unplug for a few seconds...replug and power up the TV. Some of these TVs left the factory in the service mode. The fix is pretty simple. Thanks asking and show a few hands of support!
make sure put the lamp door back before trying to turn it on because they have switches on them that allow the tv to turn on. If that is ok you probably have a bad ballast. Call a local tv repair shop to further diagnose the problem.
have you checked to see if any of your speakers are shorted out? the rt2870does have a self protection system in place such that if theres too much power being drawn from the system or if a short occurs it will shut off. or the switch that powers the sub may have gone bad so try disconnecting the sub and see if that helps. i have the same system and i had the same problem and i had to replace the onboard sub-woofer power switch.
so, you have a television that turns off immediately after you turn it on.
It sound like your power supply on the unit is out. Because I don't know the value of your unit I cannot comment on replacing the unit. But I would recommend that you use our website to find a Flat Panel TV Repairman near you. You may want to call to get an estimate on replacing the power supply before considering replacing the unit.