There are several possibilities here.
To be able to help better we'd need to know the model number.
The most likely suspects are the T-CON board, one of the two backlight inverters and the display itself.
Of those only the last one is usually not curable.
Here's an example of a popular set of inverters that , when one goes bad you can get one half of the screen very dark:
http://www.coppelltvrepair.com/p/428/sanyo-dp42848-p42848-00-backlight-inverters-replacement-for-dark-screen-no-image-problem
On the other hand, if you have vertical shadows and some flickering that's probably NOT going to be a backlight inverter.
Flickering would be caused by either the T-CON or the panel.
Since a bad panel is mostly NOT curable you may want to check the price of a replacement T-CON and decide if it is worth taking a shot with one before you displace the TV.
Again, the thing to start with is the model.
Hope this helps.
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