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Hi, I'm Pete. Welcome to JustAnswer! I'm reviewing your question now, and will post back with your reply ASAP.
The LD4655VX has an LED backlit panel.
It seems that part of the panel has stopped working, causing the dark shadow.
The TV will require a repair - since it is out of warranty, this will cost approx. $150-250.
If you let me know your zip code I can recommend a repairer in your area.
Please reply back here on this original question page - you have opened up 5 other questions about this same topic.