The back of the LCD
Try going into power setting mode and make sure that turn off touch screen lights is not checked
So, I did this repair and it was relatively straight forward. If I had to give one word of advice to anyone attempting this repair it is to remove the micro SD card before starting as I destroyed mine when trying to pry open the case. The other word of advice I have is be careful with the small little wifi piece. I had no problems with this but I can imagine severing it or closing it in the case. Overall an easy repair. I can always order another SD card and did not lose anything important but to others this can cause a loss of something sentimental.