Never personally changed one .. but I would say you would most likely require a screen module, probably held on the inside with either clips or fine screws, it would be connected via a small length of ribbon cable that would be clipped into a mainboard socket... hate to think how much you would have to pay for a replacement module.
Alternately the faulty screen you have may just require a repositioning of the ribbon cable at the point where it connects to the main board ... may also be a dry solder of a components on the ribbon cable or where the ribbon makes contact with the screen ... worst scenario is that the graphics chip on the main board may have a fault.
You could for your first port of call just take it to a electronics service store for a quote, they should be able to assist in the diagnosis of the remedy.
Cheers
