Back - light problem. [CCFL lamps inside it]. Check and replace damaged CCFL lamps. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis.
http://electronicshelponline.blogspot.com/
SOURCE: Toshiba 57LX177: Right side of screen darker than left
I am not sure...but I have the identical problem. I believe the vertical lines are caused by the inverter board and the darkness is caused by the one of the back lights that needs to be replaced. I am tearing my unit apart now and will find out.
SOURCE: panasonic 37 inch lcd tv
Check its back light CCFL lam of that side, which look darker. Replace it.
SOURCE: TCL L46E5300F flatscreen half right side screen is darker than left side
If it is an LED LCD TV, the backlight inverter board should be troubleshooted. Contact any service technician.
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