LCD computer monitors and televisions are becoming more popular than ever before, due to their technological advances and slim designs. However, after a few years of consistent use, LCD screensÂ may begin to experience problems. Screens may blackout intermittently or have a very dim appearance. These problems are most commonly due to a failed backlight or inverter. Luckily, most serious “do-it-yourself” individuals can replace these components.
1. Unplug the electrical device from the wall, and allow the device to discharge for a few minutes. If the device uses a battery (like laptops), remove the battery as well.
2. Disassemble the LCD screen cover by removing any screws with a screwdriver. Use a counterclockwise motion. On laptop monitors, small rubber covers may hide these screws. Remove these by gently prying them off with a knife. Rarely, some LCD screens may simply snap together. In this case, locate the small plastic flanges, and pry them back with a screwdriver. Then slowly disassemble the exterior screen cover.
3. Remove the internal LCD plate by removing any screws using a counterclockwise motion. Use an anti-static bracelet, and wear rubber gloves to prevent damage to the delicate circuitry. Keep these screws in safe place, and mark them to avoid confusion during reassembly. Then remove the LCD screen and place it in a safe location.
4. Locate the small backlight and inverter strip on the circuit board. The backlight is a small fluorescent bulb, and should be just behind most LCD screens. The power inverter is a rectangular circuit board, which connects to the circuitry near the backlight. Manufacturers may connect these directly to the LCD screen or may connect it to circuitry behind it.
5. Remove the backlight inverter by removing any screws (if applicable). If the manufacturer soldered the inverter to the circuit board, use a soldering gun to loosen the solder connections. Once you remove all screws and solder connections, gently remove the inverter using a pulling motion.
6. Remove the backlight by heating the soldering connection on the board to loosen the connection. Some backlights may connect via cable attachments. In this case, slowly disconnect all cables by prying back the sides of each connector. Use a gently back and forth motion to remove them.
7. Install the new backlight by reversing the removal methods. If the manufacturer originally soldered the backlight to the circuitry, use a soldering iron to heat the connection, and apply solder to secure the backlight in place. Reconnect any cables to the circuit board by snapping the connectors in place.
8. Install the new power inverter by reattaching the screws and turn them in a clockwise direction to tighten. Resolder the inverter in place if necessary, by heating the connections with a soldering iron. Then apply solder. Reconnect any wires into the power inverter by snapping them in place.
9. Reattach the LCD internal plate by connecting the screws and tighten them in a clockwise direction. Make sure all screws are securely in place.
10. Reattach the LCD screen cover by tightening all screws or snap the cover back into place. Turn on the device to see if it works.