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Hi Tasha, Unfortunately, repairs at the "pixel level" are not possible. The display is an "all or nothing" type of repair (I'm not talking about the back lights and support electronics - I'm *only* talking about the display screen). That means that the entire screen is replaced if there are to many dead pixels. (Most screens have dead pixels - manufacturers limit the number of dead pixels on a screen that can be assembled to a TV). If it the Quality Assurance people in the factory find a number of dead pixels that is less than a certain amount - it is "good" and ships. If it is more - it is scrapped.
Generally, your options are: live with it, replace the screen or buy a new TV.
Liquid Crystal Display (LCD) screens use less energy and display a clearer picture than the Cathode Ray Tube (CRT) displays that preceded them. These new LCD screens now dominate the computer monitor market. From time to time, however, pixels can become stuck and a green line can display on the screen. Removing this line is sometimes possible without sending the screen to the manufacturer for expensive repair.
That is a failure of the pixels - either because the screen has been damaged in that zone (someone hit it there) or (in case the spot has a regular form) the buffer circuits commanding the pixels have ceased to work.
In the first case the tv is dead, you can't replace the screen and not pay more than a new tv for it. In the second case the buffer board corresponding to that zone of the screen will have to be replaced - it will cost you about $175.
What you're describing is usually the result of an improperly seated connector. With the power disconnected, open the tv and locate any connectors between the LCD screen and the driver circuit board. Unplug them, and reconnect it assuring it's properly and firmly seated. Be careful when handling these cables as they tend to be quite fragile... take your time.
No, it will require a new screen & as the price of LCD TV's are dropping the cost of repair would be just as much as a new TV. It may be possible to buy a new screen cheaper on an internet site but you would then have to pay for someone to fit ti.
The problem with the screen pixels turning permanently yellow happened when the touchscreen have had a continuous pressure on it (destroying the licuid cristal display pixels; there is no repair other than touchscreen replacement.