How Capacitor Problems Can be the Root of LCD Monitor Repair
The simple fact is that LCD monitor repair is easy. If you’re handy with a soldering iron, I’d advise you against taking your laptop in for repair the next time there is an issue with your LCD. This is because most issues with laptop LCDs are caused by capacitor trouble. As a laptop gets older, the capacitors within it tend to self destruct due to simple old age. When this happens, it can cause a slew of problems, ranging from a display that’s completely dark, to a display that has strange lines flickering across it. You might even encounter a screen that is extremely dim, or which flickers constantly along its entire surface.
If your screen is nearly dim you should consider the fact that perhaps the cold cathode that backlights the screen might be failing. If this is the case, it is a simple matter of replacing the bulb. If, on the other hand, the bulb appears to be fine, you should consider the fact that you may have some blown capacitors.
The first step in LCD monitor repair, of course, is dismantling the LCD. You need to remove the housing, and this is usually held in place by screws. Removing them is usually a simple matter, but sometimes the screw holes might be protected by rubber plugs or disguised with a sticker. First remove the screws and then try to take the housing away from the LCD. Bear in mind that the housing of any LCD snap-clips together, so a small lever and a certain amount of gentle force might be needed to separate the different components of the housing.
Be very careful not to damage the housing as you ease it apart. If possible, try not to use a metal tool as a lever. After removing the housing you then need to take off the cover that protects the LCD. Some covers just lift off after you remove the retaining screws, but certain makes require that the cover slide off. You will find two boards powering the LCD, the inverter board, and the board for the LCD’s video card.
You need to examine the capacitors on each of these boards. Take a careful look at each capacitor. If the top of any capacitor is rounded, it means that that capacitor is blown and needs to be replaced. The final step is to replace the capacitor with another one that is exactly equal to it in voltage and capacity, and your LCD should function again.