If the screen on your flat-screen monitor has gone dim or dark, chances are it is the result of a faulty inverter. The inverter is a circuit board located behind the screen that powers the LCD. The screen can't function without a working inverter, but if you don't have the money to have a technician fix it for you, you can do it on your own.
Turn off your TV and unplug it from the power outlet. Place it face down on a sturdy work surface.
Remove all screws from the back of the base stand where it connects to the back of the television. Remove the base stand and set it aside.
Remove all screws from the back cover and remove the back cover. The internal components of the television will now be visible behind the screen. Locate the long rectangular metal cover on the back of the screen. This is what covers the inverter board.
Remove all screws from the metal panel and set the panel aside. The green inverter board will now be visible.
Unplug the multiple cables from their ports on the top of the board.
Lift the board off the TV and set it aside. Fit a new one in the old one's place and plug in all of the cables. Reverse the steps for reassembly.