Tv turns on get piture then get fuzzy whit line...

Question

please can any one help i have a hitachi natura c28wf523n311 when i first got it it was fine for few days then it started playing up the picture would get fuzzy white lines across it so switched it off left it off for ten min then switch back on then it was ok for a day or so now when switch on after about 1 min these fuzzy white lines come back and telly goes off can anybody tell me what to do to fix this and is their any diagrams of what i need to do or replace hope you can help me please thanks in advance................... the no off back of telly are u1a 009425
x871891
c28wf 523n311
PLEASE HELP ME IM ALL GUESSED OUT THANKS...................