There is light at the screen but no picture and sound normal

HI.usually when problems occurs without picture, either slanted picture has vertical or horizontal light on it.The one responsible for this is what we called ..PICTURE-TUBE.It is a cathode -ray tube in the television receiver that translates the received signal into a picture on a luminescent screen.It is the picture tube who creates an image that is composed of identical horizontal lines.So any problems in regards to picture whether it only shows vertical or horizontal.its the PICTURE TUBE that was damaged.Hope this idea helps..Thank you for choosing fixya.