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In some cases you will need the original remote to adjust convergence. Check that first. You can also find more detailed guides on www.TvRepairKits.com - there is a tips page with service mode codes, etc, also.
If you have the original remote you will find underneath the little door at the bottom of the remote a format button.If you do not have the original remote you can go to prefrences in the menu and change the format settings.
Yes its the convergence ICs. You will need ywo STK392-120 ICs and about six of the 6.8 ohm 1watt metal resistors to repair the issue. You can get replacement ICs and resistors at the following link and they will provide free instalation instructions with pictures so you can easially do the repair yourself and save about 400.00. Here is the link. http://servicemanuals.vstore.ca/
You may need to sinlpy adjust the convergence. Check your owners manuel for the proper way to access the convergence screen and follow it step by step. If this doesn't work, you may have a bad convergence chip. Here is my generic post for convergence.
You most likely have a convergence chip bad. In our shop, when we are working on projection TVs, we find that about 80% of the repairs we make are the same problem you are having. You need to replace the convergence chip ( there are 2 of the same chips on the convergence board, and I suggest you replace both ). If you are going to attempt the repair yourself you'll need to remember to use lots of heat sink grease so you don't have the same problem again. Also, try to get original parts, as there are times that the after-market ones don't work well. As a precaution, always remember to unplug the set from the wall before you do any work on the set. Good Luck