How to disassemble monitor Dell 1800fp ?

Remove the base by the button release or 4 screws on the back. On the bottom of the monitor near the corners you will find two thin slots where you can insert a thin wide blade screwdriver or pry tool. Very gently pry the back from the bezel toward the center from both of these slots until the bottom is seperated, then contilue from the slots around the corners and up the sides until you have seperated the entire back from the bezel. Lay the monitor on the bezel and remove the back ( do not try to remove the bezel, at least not yet). Lift the tape that secures the ribbon cable from the bezel buttons to the logic board. Unplug the ribbon cable from the logic board by pulling on the connector (not the cable). Remove the cable covers from the back of the case (one has a screw, the other has a lift tab) and disconnect the lamp connectors and ribbon cable connectors (do not pull on the wires). remove four screws and lift the metal back from the screen.

Remove the base - either button release, or 4 screws. If there are any other screws in the monitor case, remove them. Depending on how old this model is, Dell monitors usually need to be pried apart, the front coming off and separating from the back. If this is the model with the vents on the top and bottom, this is a good place to start (separate the front from the back by prying it gently all the way around) If it's a newer model, similar to a 1905FP, the front bezel needs to be pried away from the back. The front bezel piece is only about 1/4" think, and you may be able to start opening it with a very thin but wide flat screwdriver.