Liquid damaged causes black screen?

Well I never though my two year old's potty training would become so expensive until one day she decided that standing over the (closed) laptop was as good a place as any...

Fortunately, everything aside from the screen seems to work. I can connect via screen sharing from an ipad so the network and graphics card are okay and can see the mouse and keyboard movements and the magsafe is in order. I logged in over ssh and the disk checks out as well. The only thing that's still not working is the screen which is completely black.

I did SMC and PRAM resets to no avail. I even open the clamshell case from underneath and swabbed the screen interconnect to the logic board with isopropyl alcohol. No luck.

the problem is anyway isolated to the screen so I don't dare to take the logic board out and give it a full scrubbing. This would surely cause more damage than cure.

What is the probability that a replacement lcd screen would fix the problem? They cost around £50 so not much compared to a new macbook but if I spend the money I want to make sure that its likely to fix it. Is it possible that "water" damage would cause the screen to go completely black leaving everything else intact?

Its a late '08 13.3" macbook model MB467LL/A.

 

no pee smell at all so I think its worth keeping the macbook. Beside that, the only thing broken is the screen. Every other component is fine. I just wondered if you guys ever saw a screen go completely black due to liquid damage.

 

yeah its definitely black. I can't see a thing even holding a flash light against the screen. I've tried the brightness adjustment too. No luck.

Could it be the display data cable? Is there anyway I can test it?