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.
hope this helps,ben :-)
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