I have a Sony KP51WS500 and have a bad tube also. It started about one year after purchase I started getting blue lines. They started to become anoying I change the brightness and contrast to reduce their presence so that it wasn't so noticable. Eventually, the entire screen would fade to blue. Now I am faced with replacing the tube(s). My wife heard from a technician that the tubes only last about 5000 hours. if you leave your tv on 12 hours / day that's 4380 hours. So I'd be replacing it in two years minimum and at $400 - $500 a pop that's just plain stupid. I'm buying a plasma.

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