Sony Videoscope Kp-46v15 Color Rear Projection Tv Hi I Have An Sony Videoscope Projection T.v How Can I Tell Witch Part Is Bad It Did Hum And The Screen Went?

Hi i have an sony videoscope projection t.v how can i tell witch part is bad it did hum and the screen went? - sony videoscope kp-46v15 color rear projection tv

Supply Crazy screnn small nose and then disappeared again, and the sum is large, this may be what it is.