If you have repaired these TVs before, you know exactly how to do it. The only possibility would be that one of the STKs IC could be defective even if it's new.
I would also suggest to check any other components around the STKs area and also check for dry solder joints, specially around the high power resistors.
You will need to have the service manual to get into service mode to adjust the convergence values.
Let me know if you need further assistance.
After replacing the stks you need to perform convergence adjusment procedure.
If Stk keeps burning out then replace convergence board.
First do convergence setup, follow the procedure on servicce manual.
If you still get troubles, test for continuity the small resistors near to the STKs on convergence board. If they keep blowing there is a powering problem on STK, better replace the convergence board (you can buy it without STKs) before blowing the convergence ICs again.
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