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If the tv isn't fully shutting down. but just flashing on and off then it
sounds like a backlight supply fault.
All LCD screens have what can only be described as micro flouro lights inside the screen module.
it is possible that the power supply is faulty causing them to flash on and off every now and then. or the tubes themselves are damaged.
to confirm this..
Lay the tv down flat on its back and power up in a well lit room
get down close to the screen and look across it at a acute angle
now if the black screen looks like it is still displaying an image then it's definatley your backlights!
in which case it could be a simple fault in the power supply.
so if your feeling confident in yourself i can talk you through what to look for in the supply..but try this first and get back to me.
Check to be sure that there is no voltage on the input line. You don't indicate what input you are using. Since the set appears to work without an input connected, try looking at the input cable. Also, if the problem is internal to the set, shorting the input jack would cause the same behavior. Please update this with what you find.
The 46H84 has 3 CRTs instead of a lamp. Red, Green and Blue. Your red CRT is shorting out shutting down the set.Here is how you test that theory. Remove the speaker grille, there will be an access panel behind the grille remove that and you will see the CRTs red is usually on the left. hit the power momentarally to locate which tube is red. then power down and unplug the power cord. Carefully remove the tubes Circuit board. ( you may have to carefully slice the glob of silicone applied at the factory to get the circuit board off) Once you have the circuit board off the Red CRT make sure it isnt touching anything and try powering up the set. If the set stays on and the other 2 CRTs light up. That tells you the RED crt is shorted and thats whats shutting your set down. Let me know if I can assist you further.
try unhooking the wires coming off the power board you should be able to unhook every thing except the switch wire and se plug if the green lights stay on and the red don't come on then you have something loading down your power supply if it still shuts down you need a new power supply