Since the convergence menu option did not help, you'll probably need to replace the STK convergence chips (ICs), along with the required resistors. Look up the model number of your TV and search for 'STK' to see which chips are right for your set. To be sure, you could open up your TV to see for yourself.
The Youtube video below could help...
[url=http://www.youtube.com/watch?v=esk4nYZKFcg
http://www.audiokarma.org/forums/showthread.php?p=2306005]www.youtube.com[/url]
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