Backlights and inverters
When a laptop monitor goes on the blink, there are just a few things that can be wrong with it. Any reasonable expert in LCD monitor repair will tell you that the fault can lie with the inverter, the backlight, or the video card board. The problem is telling where the fault lies. When the fault is with one of these three components, how exactly do you tell where the fault lies? After all, you probably have no testing equipment at home, and you can't afford to change all three components. But there's no need to worry, because there are methods of diagnosing which issue ails your laptop.
The first thing to consider is just how your screen started malfunctioning. Did it to out all at once? If you, the fault is probably with the backlight. This is a cold cathode light that is usually either a part of the inverter board, or connected to draw power from that board through a cable. Now it's quite interesting, but all it takes is for this bulb to go out for your screen to malfunction. And yes, sometimes, when a repair facility takes a small fortune for LCD monitor repair, all they're really doing is replacing a light bulb.
If, on the other hand, the screen didn't go out all at once, but gave a certain amount of trouble beforehand, then the trouble is probably with the inverter board. The inverter board can have a number of issues, but the most usual is blown capacitors. You can just replace the inverter or video boards if they're spoiled. Check both boards and look over the capacitors carefully. One of the boards will usually have ruined capacitors if the backlight is fine. If this is the case, you have a choice before you - to either replace the boards or the capacitors themselves.
Replacing the boards will obviously be easier. However, it is also more expensive. The cost of capacitors is actually very negligible. But of course, if you choose to repair the board, this will involve removing the capacitors and soldering new ones in their place. This may seem a complex job, but it's actually not too difficult once you get the hang of handling a soldering iron. If this is the way you choose to go, remember to note carefully the polarity of the capacitors - get that wrong and you may have a serious LCD monitor repair problem on your hands.