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Many modern flat panel sets (and some CRT-based sets, for that matter), do NOT use a relay for turn on--they just "gate on" the run supply, usually with a pulse from the signal board, rarely over a data line.
If...your backlights are running, and you have all of the run volts from the supply..but NO turn-on pulse from the signal board..(if it is strying high or low--and not changing wiht the power button)--THEN you likely have a signal board issue..
BUT..
If this set has a "Tcon board), (near the top, usually of the panel, though I have seen them at the bottom I think), the UNPLUG this--and re-check to see if the set will power off. it could have a data corruption, killing the on-off command.
Also--if the IR sensor is on a seperate board from the keyboard--unplug it. Then do the same--one at a time--for the keyboard.
FInally..unplug the BL inverter/driver board. There is a CHANCE --it may be corrupting data.
If not luck...likely bad signal board.
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