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I just replaced two STK 392-110 chips in Toshiba 50H72 and it fixed the problem. I'd like to know what would be the best way to adjust convergence in service menu. Do all the lines must be perpendicular and square in convergence menu? Would it be a good idea to use Laser level to get all the lines straight? Any tips please. Thank you in advance.
 

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A laser level can be helpful, or you can use a string or other straight edge. Understand that not every line is going to be straight, and correcting one may cause another to be off. Geometry is not perfect in these sets and you can chase your tail trying to get it so. Go for correction of the largest errors in geometry and focus on convergence more. A little bit of geometry error is much more tolerable than even a tiny convergence error.
 
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