If the backlight of your laptop screen has issued, you can't see any image. In order to fix the problem, the entire inverter board and its connected screen cable will need to be manually replaced. Below is the instructions for your reference.
First. Check in the manual of your laptop or search the information from the Internet to support the section of the manufacturer's websites. Just get that what model for inverter board you need for your laptop, take my new LP156WH4 screen as instance, I purchase a right one from a reputable site, laptoplcdscreensupplies.com, and then i fix it by myself.
Second. Turn off the laptop's operation system. And shut down the screen lid. CTurn the whole laptop over so the bottom end of the case is facing up toward you. Locate the battery-release latch and press down on it with one hand, and then pull the battery out of the case, setting the laptop battery aside.
Third. Locate the rubber pieces on the edges and top of the screen. Pop the stopper pieces off of the case by inserting a flat object underneath them and then pulling out toward you. Use a screwdriver to pull out the screws hidden underneath the stoppers.
Fourth. Put the laptop back over and open the screen back up. Slide a flat and thin object, such as a screwdriver, directly underneath the seam of the plastic bezel underneath the screen. Wiggle the screwdriver up and down gently until the bezel pops off the case. Lift the bezel up and check to see if there is a cable running to the motherboard. Disconnect the cable if there is one.
Fifth. Pull the case on the LP154WX4 screen replacement towards you, and then remove it from the laptop. Locate the inverter board at the bottom of the screen and find the cable running from the inverter board to the motherboard. Pull off the strip of tape on the board and remove the screws holding it in place if there are any on your particular model of laptop. Disconnect the cable from the motherboard.
Sixth. Connect the motherboard cable for plastic bezel and place the bezel back onto the laptop case.
Finally, just put the battery into the laptop and power it on, and then once the manufacturer's logo appear on the screen, it mean that you are successfully to install the new inverter board and cable rightly.