My iPhone works but the screen doesn't?

I would first try and reseat the connectors for the LCD and Digitizer. If they popped loose or have any corrosion sometimes that will be an easy fix. Unplug the battery, Remove the plate holding them down and reseat. Check for corrosion or burnt or damaged pins while your in there. But unless its gotten wet, you should be okay. Once you plug them back in, plug the battery back in and see if it kicks on.

If it does, close it back up and your ready to rock and roll.

If it doesn't, you may have a bad LCD or Damage to the mainboard.

Also, if it kicks on with the apple logo but then the back light shuts off a split second later, that's usually the indicator of a bad LCD. Replacing the front screen assembly should resolve this.

You tried a hard reset or restore? Do you see any shadows of your screen when you angle the display toward the light? It is possible that the display assembly may need to be replaced, due to a malfunctioning LCD. It is possible that the ribbon cables or connectors are corroded, or loose. It is possible that your backlight IC/coil are malfunctioning. There are plenty of possibilities. The cost for spare parts is depending on your location.

salam...

it seems like an lcd problem... you will have to replace the display assembly to know for sure. I hope its not the motherboard.

Malik.

Make sure that lcd flex cable is fitted properly in the logic board.