Latitude E7250 doesn't recognise when lid is opened/closed

@haslamit the switch is a magnetic sensor activated by a magnet in the LCD bezel. The power from the motherboard to the Inverter, is cut off when the Display Switch Module is depressed. Use a magnet and swipe it sound the outside bezel of your laptop. You should feel when the magnet reacts to the one in the cover. Now you have the position in the lid. Move the lid to the close position, wherever the magnet position of the LCD cover meets the bottom case, is where the sensor should be located. You have not told us what your computer does, or does not do , that makes you think you have a bad lid switch. You can download the service manual, which is actually part of the owner manual, from here