Help with broken screen on LG VX8300 and Motorola Rival.?

[CArl]

I have a LG VX8300 and a Motorola Rival. On the VX8300, when i turn it on, the keypad lights up, but the screen stays black. On the Motorola Rival, when I turn it on, the screen lights up, but it's green and black. Does anyone know how I could fix this myself? Thanks.