Hi,
Yor tv have problem with T con board. T con board is one which drives the pixels of the LCD panel. If any of the driver satge in the T con board is faulty then this problem can occur.
Some times bad contacts on the connections of the t con board can cause same problem. Remove the tv and find out the t con bard. Remove the connections to it and the reconnect the connections. Then check, if the problem remains the same then the tv need a new T con board.
You have didn't mentaioned any model number of your tv. So it is not possible to show you exactly how T con board looks.
Normally in all lcd tvs the tcon board is place on the bottom or top middile position. Which will be cover with metal cover or aluminium foil.
Here I have added a link which will lead you to the picture of T con board for toshiba.( Not exact one)
T con
http://electro-medical.blogspot.in/
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