My RCA P60755AT has suddenly developed a distorted picture. The bottom of the picture is concave and part of the top of the picture is now offscreen since I can only see part of the channel #. Thank you in advance for any help.
Jim

The Service for this TV is P60755ATLG1 and the Chassis is PTK178LC. I have searched extensively through the other posts for this problem and these two numbers are almost always asked for. Sorry for leaving it out of the original post.

Jim

IT SOUNDS LIKE THE STK NEEDS TO BE REPLACED. IT MAY HAVE TWO IN IT.

PTK178 chassis does not use convergence output IC "STK" in it.

how does it converge without an stk?

there is a convergence board on the RHS that uses transistors instead of STK IC.

thank you