The laptop screen turns on properly then flickers and goes black. If you restart the laptop the failure sequence repeats.

Possible cause:

1. LCD screen inverter failure.
2. LCD screen backlight lamp failure.

Possible troubleshooting steps and repair solution:

When the laptop LCD screen flickers and goes black, most likely the problem is related either to the screen inverter or backlight lamp inside the screen.

You cannot tell which one is failing without testing the laptop with another working inverter or backlight lamp. Both parts have very similar failure symptoms.

If you have to guess, replace the inverter board first. If it doesn’t help to fix the problem, replace the LCD screen. It’s possible to replace just the backlight lamp inside the screen but it’s not easy and should be done by an experienced technician.

The lower part of the laptop screen displays horizontal lines running from left to right and flickers. Moving the screen makes the image better or worse. The top part of the screen displays image properly. You’ve tested the laptop with an external monitor and the external video appears to be normal.

Possible cause:

1. Bad connection between the video cable and motherboard/LCD screen.
2. Bad video cable.
3. Bad LCD screen.

Possible troubleshooting steps and repair solution:

1. Try reconnecting the video cable connection on the motheboard.

2. Try reconnecting the video cable connection on the back of the LCD screen.

3. Try replacing the video cable with a new one.

4. Try replacing the LCD screen with a new one.

The laptop screen works fine on startup but after a while the screen starts to flicker and goes dark. If you restart the laptop, the screen turns on as normal but later it starts flickering and goes dark again. Time intervals between screen failure may vary.

Possible cause:

1. Backlight lamp failure.
2. Inverter board failure.

Possible troubleshooting steps and repair solution:

1. If the screen flickers before it goes dark, most likely the problem is related to the backlight lamp which is mounted inside the LCD screen. You’ll have to replace the backlight lamp inside the screen (for advanced technicians only) or replace the whole screen.
2. Replace the inverter board.

If the screen just go dark without flickering, try replacing the inverter board first and after that replace the LCD screen (or backlight lamp).