When I first turn on the tv there is no problem with bowing. But after 30 or so minutes there is a bow at the top and bottom of the screen. The bow moves down as time goes on. There is no problem with convergence of colors. I was wondering what this problem results from and how much it would be to fix it. Thank you.
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Sounds like a problem in the vertical sweep circuit. Check voltages to your convergence ICs. If they are not to spec then look for bad fuses and capacitors on the power board. These will throw off the DC voltage to the convergence chips causing the bow effect. I've had a single bad pico fuse ($1) cause this symptom.
Thats usually a very easy repair by replacing FL231, DL231 and CL230 total parts are about 11.00 at the following link and they provide free instructions. The components are all listed under RCA parts category. http://servicemanuals.vstore.ca/