what to do when your monitor leaves you 'in the dark'
There are a lot of tutorials and articles on the net that tell you what to do when you want to try your hand at LCD monitor repair. Mostly, minor issues are related to a disruption of the power flow to the monitor. Minor issues involved with LCD monitor repair can also include a cold cathode lighting system that's failing.
In case you didn't know it, there's a cold cathode light that's the source of the illumination in your monitor display, and your monitor can appear very dim if this light is failing. In this case, it's just a simple matter of replacing the bulb. However, what do you do if your monitor is completely dark? Well, here's a step by step guide. The very first thing that you need is a comfortable work space. Place the monitor face down on a soft cloth or on some padded materials that will prevent damage to the monitor screen.
Now carefully unscrew the screws. You might expect the casing to come apart, but in reality this isn't at all what happens, because most manufacturers include a catch system that still keeps the casing together. These clips are internal, and releasing them will require you to know what you're doing. I'd suggest downloading the manufacturer's manual if you don't have it already. Now, based upon the manual, try to release these clips. Make sure that if you use a lever to separate the case, your lever is made of plastic and not steel.
Beware of using too much force, or you may be left with a case that's in pieces. Once you've got the case open, the rest is much easier. Again, based upon the manufacturer's manual, I want you to locate two circuit boards. One is the inverter board, and the other is the video card board. I also want you to take a look at the cold cathode light that provides illumination to the screen, just in case it's burned out. If the problem is with the light, replacing it is an elementary matter. However, if the problem is not with the light, dealing with it will involve additional complications.
Now you have to look at the boards, and especially at the capacitors on them. If any of them have a rounded top, that's the one that's damaged. You need to get a capacitor of the same capacity and voltage, and replace the damaged one with the new one, making sure that you don't reverse the polarity. Take photos to prevent mistakes. And when you complete your LCD monitor repair your screen should be working again.