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Shine a small bright light at the screen when on and see if you can see a faint picture in the dark screen. If you can then your backlighting is not functioning due to ccfl (inverter), power supply, or back light lamps.
It appears that the greenish discolored area could be cause by the Yoke or it could also be some magnetization on the screen as well.
If it's the yoke that moved slightly out of position, it can be adjusted, but i would suggest to let a repair tech do it due a high voltage around the area.
Try unplugging the TV for some time and plug it back in and hopefully the demagnetizer circuitry might be able to clear the greenish spot.
Let me know if you need further assistance.