recently the screen to my s4 has "burnt out"? I guess you could say, but the thing is I can still turn my phone on and the buttons still light up. I'm planning on getting it fixed Friday but I just wanted to know could anyone tell me what actually needs to be replaced? Should I just go with the whole screen if they have to replace the Lcd anyway? I figure the Lcd has to be what's burnt out but I don't wanna be hosed or spend any money on repairs I don't need. Thanks for the help.