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Sounds like an inverter problem. On some of these sets, the inverter and the power supply are on the same board. These boards tend to be quite pricey, $100 + range. I've worked on your particular model with the same problem, and it was a bad inverter/power supply board. I would recommend you get a diagnosis to be sure.
Could be bad capacitors on the power board. Had a 32" polaroid w/sound no pic. Had two bad caps on ps. Replaced, good as new or better. Google bad caps so u can see what they look like. Usaully they are bulging or leaking brown ****. Hope u can solder.
The odds are one of the capacitors popped. Look around the circuit boards for this bad capacitor. It should be deformed and stick out like a sore thumb. Radio Shack or some local electronic supply place should carry replacements.
Hmmmm..sounds to me that the power supply has blown. Remove the back cover with no power to the tv, and check the central power supply board.You may find that the capacitors on it have exploded (they should have flat tops on them and bulge up and sometimes excrete a brown liquid when faulty). If these are faulty replace all and all should be ok..Also another problem could be an exploded y-sus buffer chip.Looking from the back..it is located along the far left side.Check that none of the chips which are covered in clear resin have shot or gone brown along their edges.If they have, you need to replace the y-sus and the y-sus buffer. You can buy these boards from ebay or various websites by searching.
I've seen this problem before. Try to adjust the horizontal settings in the tv. you should be able to adjust the picture up just a bit and it will get rid of the lines. also if you are hooked up thru component or hdmi you should be able to press the # button on your time warner remote to fill the screen. Hope this helps.