I just drop my Dell 1420 laptop and ask for some technicians , there is a display but there is no light, they said my laptop’s problem was LCD LIGHTS. Can i just buy any 14.1 LCD lamp?
Most likely the screen has no light because you damaged the backlight lamp. The backlight lamp is mounted INSIDE the LCD screen. It’s very hard to replace the backlight lamp and if you try, there is a good chance that you damage the screen. Do it only if you have nothing to lose.
The display disassembly instructions could be found in this service manual for Dell Inspiron/Vostro 1420 laptops. It is not necessary to separate the display panel from the laptop. Simply remove the screen bezel, disconnect the screen from the video cable and replace it with a new screen.