Common Modes of Failure for LCD Monitorsby Zachariah C. Miller
Knowing the reasons why liquid-crystal display (LCD) monitors fail will give you the knowledge you need to avoid problems. If your LCD fails, you've be able to easily diagnose it and determine an appropriate course of action, whether it be repair or replacement.
Failure of the LCD backlight is a fairly common problem beginning to crop up in LCD technology. If the backlight fails, the monitor will go dark and it will become unusable. Repair of a failed backlight requires expert repair. You can contact your manufacturer for warranty and service information for your LCD panel.
Power Supply Failure
If your LCD screen goes completely black, it may mean that the power supply has failed. If this happens, you can repair it for a moderate fee. The failure may be in the internal power supply inside the monitor, or in the AC adapter power supply cord. This type of failure is repairable for a small to moderate investment in labor and/or parts.
If your LCD monitor fails mysteriously, it may be that some of the capacitors on the internal circuitry have begun to bulge. Bulging in capacitors is caused by the electrolyte inside drying up. This usually occurs in cheaply made capacitors. The good news about this type of failure is that it can be repaired. The individual capacitors can be replaced with fresh ones, which should result in your monitor's return to normal functionality.