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Thank you for posting your question! I am looking forward to solving this problem with you. I have a few questions for you...
Does the TV look the same after you replaced the amp board as before you replaced it?
If you are still having a problem after replacing the convergence amp board you should try and replace the convergence power board. It is the board to the left of the convergence amp board.
If you can use a meter the plug between this board and the amp board is labeled with voltages that you can check, if they are missing you know the board is bad. If they are there then we will need to check some other stuff.
As far as the alignment is concerned the auto in the customer menu should do just fine, there is a service menu that we can go into and do some adjustments but i dont think thats your problem at this point because the convergence power board on the model is very common to go bad.
I think you need to replace the convergence power board. If there was no change from the old to the new amp board then it was not the problem, and something has to be causing the problem, Tv's dont normally go out of convergence for no reason. If you give me the full model number (with thy yxXXX) at the end I will get you a part number for the convergence power board! Let me know
Pn for the convergence power board is 264104R. Let me know how this goes!
I'll order it tonight and let you know how it goes.