There is a possibility of a defective integrated circuit on the SRS/WOW board. But as a work around you can connect the set to an external amplifier. You are correct in that there is not a place to directly connect the speakers, but there are line level audio output jacks on the back of the set which can be fed to an amp. The problem may still be present; I honestly don't remember if the external audio is before or after the SRS board. Good luck.
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Sounds like you have a bad convergence power supply reg,part number is 215530,unplug the set remove the back cover on the right side above the module with 6 heat sinks,is were the pwr. supply is located,the part is on a heat sink on the board
If it's staying on for just a short period of time it sounds like there is a sensor that is giving the unit a faulty condition (Perhaps for reason or due to a fault in the sensor). There are normally a few temp sensors in the TV around the Lamp and Ballast. They may be bad, or the lamp or ballast is just generating too much heat.