THE PROBLEM WITH MY SONY KP51WS510 IS THAT THE PICTURE IS CURVED UPWARDS AT BOTH ENDS AND THE COLOURS IS OUT OF ALIGNMENT . I HAVE CHANGED THE STK392-560 IC"s AND CHECKED THE RESISTORS AND CAPACITORS BUT THE PROBLEM STILL EXSISTS ,ANY ADVISE ON THE NEXT STEP. AND I NEED A SERVICE MANUAL.
Here is a link to the manual:
http://www.techlore.com/download/21045/Sony-KP51-57-65WS510/
Now, there are many picofuses to check on the same board as the convergence IC's plus two more on the power supply board (G-board) mounted vertically on the left side of the chassis. I suspect bad G-board fuses are causing your bowing problem.
Can you replace a STK392-560 with aSTK392-570?