PSP suddenly has vertical lines no image

For your first PSP: there is a loose conection of LCD Screen with the motherboard and the solution is as follow:
You can open the PSP and just lift the LCD Screen up be sure before lifting LCD Screen one thin Switch panel of micro buttons Home,VOL,select etc, you have to remove this first then only it is possible to lift the LCD Screen and after that you check that broad connection strip which is fixed with the motherboard socket you remove it this strip and refixed it again,your problem should get solved if suppose your LCD Screen is not broken.