Computer displays can have any number of ailments befall them, and Dell LCD monitors are no different in this respect. While it can be difficult to determine the problem with a monitor in order to repair it, there are a small number of common errors you can look into and fix, even if you have no prior hardware repair knowledge or extensive computer experience. You can perform these repairs with nothing more than a Phillips head screwdriver.
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Things you need
- Phillips head screwdriver
Observe your power source. If the screen is dark, ensure that the computer's power cord is plugged snugly into the wall outlet or surge protector. Check the connection from the monitor to the computer and ensure this isn't loose.
Check your brightness settings. It is possible that there is something wrong with the settings or a sensor that is resulting in the Dell LCD monitor's backlight being off. For a free-standing Dell LCD monitor, there should be dedicated brightness controls at the bottom of the device. For a laptop, you can adjust the LCD display's brightness with the brightness setting keys at the top of the keyboard, just above the numeric keys.
Check the "LCD closed switch" if you are using a laptop. This switch acts as a sensor in a laptop that judges whether the display is opened or closed. Sometimes this can get stuck in the "closed" position. Locate the switch, which should be directly beside the bottom of either the left or right hinge on the laptop's display (this depends on the exact model). Tap the switch with your finger to unstick it and turn the backlight on again.
Consider repairing the inverter cable. The inverter cable plugs into the logic board of the Dell LCD monitor display and, when loose or disconnected, can affect the performance of the Dell monitor's backlight. Access the inverter cable by first removing the screws that reside along the perimeter of the monitor (or "bezel"). Depending on the model of the Dell LCD monitor, these screws may be on the back of the bezel or on the front display, hidden by plastic or metallic "caps." If there are caps, simply gently pry them off. Once the screws are exposed, use a Phillips head screwdriver to remove them.
Pry the bezel gently off to reveal the inverter cable, which will now be visible at the bottom centre of the monitor. The inverter cable is black or white and runs into a cable connector beside it. This connection may have become loose. If the cable connector is in an upright position, hook the inverter cable back into it and snap the connector into the horizontal position, which is considered "locked."
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