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Do you mean the 20F420T? RCA doesn't have a 20FP420T as far as I can tell.
Unfortunately, you can't turn off the Front Panel (child lock) without a remote. All of the front panel Power button to turn off the set but not to turn it on. You need a remote that matches the Menu function. Press Menu, then use the Ch+/Ch- buttons to select Preferences. Press OK then press Ch+/Ch- to highlight FPA lock. Use the Vol+/Vol- buttons to toggle the lock function on or off. (Off lets the front panel work normally) Then press Menu repeatedly to exit the menus. A substitute remote can be obtained here: http://www.remotes.com/remotes/servlet/rs?a=Search&o=c&uid=0&m=20F420T&uuid=12994577706920 . This is guaranteed to work with the 20F420T . Most universal remotes should also work as long as they were programmed after 2006.
The first couple of seconds of operation, most TVs are doing some self-test and if something has failed making full power on dangerous (for fire) they will shut down.
Either a major component in the horizontal section has failed or the main power supply itself is defective.