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The II2 Bus has the fault. It detects some malfunction from other circuit boards. Your TV need a through checkup. Contact any experienced service technician, as the work is a very skilled one, and not a user reparable.
If the lamp has been replaced I would think the Lamp ballast would be most likliest followed by the color wheel and then the Digital board. You can get any part needed for your model at www.tvrepairworld.com just leave them a email they respond quickly.
Since the TV is still receiving power, the problem is going to be with the TV's mainboard. After you unplugged the TV and plugged it back in, you said the power light went out again, so I assume the standby light wasn't flashing again? The flashing standby light is indicating an error code so my suggestion is to contact Sony for service options regardless if there is a warranty or not because service is the only solution to this situation. Don't forget to provide them the error code or 4 flashes repeating.
My Olevia LCD TV did the same thing. I turned off the back power switch and pulled the power cord as well. Left off for a couple of minutes and then re-connected cord and turned on main switch. I then turned on the front power switch and it come on just fine. These new sets have computer-like guts so you have to re-boot them sometimes. I hope this works for you.