How can I repair my black screen

@juniorjean the no video issue can be related to a bad backlight circuitry. A simple check for that would be to darken the room and turn the computer on. Then use a flashlight and angle the light at the screen on different areas. If you can make out the splash screen or even your desktop, you know it is your backlight. You would then need to check the backlight circuitry on your motherboard.

Next I would suggest to connect an external monitor. If that works you know that you have a bad LCD, bad display cable or bad display connector on the mother board. If that also does not work, the issue could be with your GPU or even a BIOS fault.

To work on your computer use the maintenance and service guide