wondering??

I hope someone can tell something?:( I have a 35" TOSHIBA (CX35D80) TV, I came home the other day & turn the TV on & the sound worked but the screen had a white line going across it I first thought it may be the picture tube!!, but my friend said it my be something esle because he said if it was the picture tube you probably wouldn't see nothing. So I was wondering if I should get it repaired or just get another TV please tell me something THANKS