I just replaced the ccfl bulb in a toshiba a215 about 5 minutes ago. And it turns out that wasnt the problem.
Don't do it unless you absolutely HAVE to.
try replacing the inverter first, for the toshiba it was only 8 bucks, and they are much easier to replace than the ccfl.
maybe open it up and try to listen to the inverter- mine made a somewhat inconsistent high pitched buzzing. wish i noticed that before.