1. CCFL Backlight.
2. lcd inverter
I changed the backlight for my old dell laptop. Basically, it is not an easy
job.The local store may charge $150 for this service.
For the LCD inverter, it is not difficult to change it.
if you don't know how to open a laptop, maybe buying an external monitor is
much easier. Or buy a new laptop (then sell your defected one on eBay for
around $150-$200 if your laptop is not too old. Now laptop is very cheap.
A decent brand new laptop with Intel i5 processor only $500.