Sony Ericsson Touch Screen Phone How Do I Fix The Touch Screen Buttons On My Sony Ericsson K850i?

How do I fix the touch screen buttons on my sony ericsson k850i? - sony ericsson touch screen phone

My party K850i just had launched an LCD, but when I on the phone but it seems that the button does not work on the touch screen.

Is this a problem with the LCD touch screen is not compatible or something more?