Did you ever find out where your power failure was? I've got the exact same problem. If it's a quick capacitor replacement I'm up for it, but from your follow up post it doesn't sound as straight forward.
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Replaced all the capacitors in the power supply is the best bet to solved the power shut down.Becauce capacitors is unprodictable very small amount virable dip in Micro farets the whole power board will shutdown.Capacitors testing with the voltage meter is very hard to determine the micro farets in and out went power in use or power it off.
My Sceptre X30SV had no power. I unscrewed the panel where the power supply is (in the back of the tv) and unplugged the power brick. Shortly after I plugged it back in and it has worked for the past 24 hours. I'm thinking my power supply is on its way out. I have purchased a voltage meter, how do I go about testing the power brick? Thanks for your help in advance!
Look at the top right venting louvers above the power cord receptacle. A green LED glows when the power supply is providing voltage to the TV. If the LED is off, you'll have to check the wall receptacle for 110 Volts, check the power cord and check to see if the power supply is getting 110 Volts. If you have voltage in and nothing out of the power supply then buy a new one off E-Bay. Quite often electronic devices will "turn off" when warmed up because of expansion of a faulty connection and "turn back on" after it has cooled. Also, their could be a safty thermo switch within the power supply that is sutting things down because of over heating. So, it's a **** shoot. I fixed mine with an E-bay AC adapter.
So here is the scoop, sceptre told me to fill out an RMA request, fax it in with CC# and it would cost 250.00 as long as it was not the display. Upon approval of the RMA they asked for an additional 80.00 return shipping fee to be added on to the 250.00. Plus it would cost me 35.00 to ship it from Missouri to City of Industry, CA. So as you can tell it would cost me 365.00 just to send it.