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This kind of problem occurs due to failure of convergence output ICs in Sony KP-51HW40 tv. Replace convergence output ICs to solve tv problem.This set uses two of the STK-392-570 IC chips for this (convergence problem) Local tv repairman will do this job if you have no experience of electronics stuff repair.
This sounds like convergence output IC problem. convergence board would have to be removed - remove and replace 2 STK IC's and check the surrounding resistors. Shops usually charge between $200-$400 Be sure to vote/rate me if this helped Thanks! See link for more detail http://www.ehow.com/how_4575598_yourself-projection-tv-repair-convergence.html
its failure of Convergence Out IC chip and requires replacement. TV has 2 IC chip in convergence circuit and I would recommend to replace both at same time. Let me know exact model of Sony 65" TV to provide you more technical info.
Hey, found the problem. Your Convergence IC chip went bad. Buy one at Bluestar International Components (bluestar-online.com) - order part number STK392-010 for 6.99. I've read that there are two in the system and replacing them both at same time is a good idea...so, order 2. Now, if you are handy, it will require you to open the back of the TV and solder out the old chip and replace with new. If not, then you might as well call a TV repair person and have them fix. However, every place I've called works on a minimum fee for "large screen TVs" - the cheapest I could find in Atlanta was $399 minimum service fee. So, I'm going to risk the home sodering job .... it's a 10 year old TV and as good as it's been to me, if I screw it up, I feel I've gotten my money out of it. Good luck with your repair. My parts are on order.