Black screen when turned on?

Hi, have a PSP GO with a black screen when turned on, still functions (you can hear sounds etc from startup and buttons but a black screen) I have also replaced the display with a brand new lcd and ribbon cable but this has not changed anything, please help me!

Anton

Just an update, did some more tedious research online and found that it is most likely a blown backlight fuse! Will have to get the solder iron out I guess. Will keep this updated for its rich historic value.