Sharp 36U-S60 36" TV "element blue line screen" Questions

...screen suddenly became saturated with blue and the retrace lines are very visable. Does this sound like the picture tube is gone? could be but there are a few checks that need to be donr first.. Try ...

screen is blue and has light blue horizontal lines. It usually has sound. Within in seconds it will shut down again. The set is 7 years old and works great except for this problem. When it was 2 years