Bravia KDL-37P3000 display and color error

[sserbes]

i have a sony bravia KDL-37P3000(5 yrs old) with screen and colour problems. here's a link to describe the problem : http://www.youtube.com/watch?v=vMdACo-izis

this problem appears by all the sources: PC [more with hdmi cable but less with VGA cable], game console, dvb-s receiver,DVD.

specially you can see the former scenes on screen while watching the HDMI sources.They keep appearing for a few seconds on screen.

adjusting contrast,backlight,saturation etc makes problem more seemless but thats not an exact solution. Only way to stop this error on PC with HDMI cable is reducing the screen frequency to 50 hz. That stops the problem but i dont have a chance to change the frequency of other devices.

So i wanna know if it can be fixed or not and how much will it cost to me?

Thanks