E1505 Black Out

hello all,
well lets start off by saying i have tried all most and all ways to pin point what is wrong, i have ran Dell D, i have did the specail hold power discharge button, hooked it up to another monitor, Well the display work fine with another monitor, which led me to believe its the inverter or the lamp light on my lcd. my main thing here is my computer is old, not old old but old enough. Did you know the Nazis over at Dell tried to charge me 400+ dollars to fix my 700 dollar labtop. and that was when it was new, So im going to solo this mission anyONE WITH SOME INFORMATION ON HOW SHOULD I GO ABOUT INSTALLING INVERTERS OR LAMPS??

i would really like your help/opinion
sean