How easy to check MB Pro Display Cable?

I'm looking for help from anyone who's worked on the display or display cable for the 15" MacBook Pro (2007 model, Santa Rosa). I want to know how easy it is to check for a bad display cable.

About two months ago I began to get the problem where the built-in display begin to flicker and fade to white, sometimes "refreshing" (update the screen, freeze, then fade to white) on a keypress or mouse click or some other update to the screen was made. My guess is that it must be either a bad display or a faulty display cable.

The external display works fine, so I ran it in clamshell mode for a while, trying to decide if I wanted to replace the display or just get a new computer. However, after a few weeks, I restarted one day and the built-in display was working fine. I treated it carefully, and it was doing fine up until today, when the problem showed up again.

Now I'm leaning more toward it being a display cable problem. If it's just that, I'll replace it and keep the computer; a bad screen I'd rather not pay to fix. I've opened this one up already to put in a hard drive, but from replacing the CCFL in a PowerBook I know displays can be a real pain to work on. Can someone who's seen this problem suggest if my hunch is right, and how easy it is to check before I take apart the whole top assembly?