I think that what he's trying to say is that the screen is not showing any video. How can you say that the back light works, if the screen does not turn on? I belief that the problem might be the back light fuse. To double check if it is the screen and not the back light, put the psp screen underneath direct light while the psp is on. You should be able to see the xmb menu. If this is true, then is your back light fuse. Solder bridge the back light fuse on the mobo. If is not the fuse, then, double check the lcd wire ribbon connector to the mobo. I hope this help, good luck..