You wake up one morning and open your laptop screen to see black, but the computer is clearly working because you can hear the voices of the fans. Fear comes quickly when you think what is wrong. If you look closely you can see a vague outline of what is on your screen, and if you light a flashlight on it, you can create all the images and text. If you wanna buy Best laptops for PowerPoint presentations contact us.
This is a very common problem with laptop screens and usually has only 2 possible causes: the background light on the screen is off, or there is a fault in the background inverter. A backlight is basically a fluorescent bulb that illuminates it from behind your screen so that you can see everything clearly as usual. These bulbs can occasionally become inactive, causing your computer screen to turn black and only a rough outline of objects to be seen. Another possible reason is that the backlight appears when the inverter is bad, such as the backlight.
The purpose of the inverter is to convert the DC power of your laptop battery back to AC power, which is required to activate your backlight. If the inverter breaks, the backlight will not provide enough voltage, so it will not light up, which makes the screen very dim. Sometimes, there is a way to determine if it is to blame for your backlight or to blame the inverter like your screen.
Normally, when the backlight is off, it does not light up at all, or it brightens the screen in red so that it can return to normal as you continue to use your laptop. It’s easy to get bored. Discard the video card. To reject the video card, insert an external screen into the VGA port of your laptop, which will be on the back or side of your laptop. If you do not notice any discoloration after connecting the external monitor as you did before, then you know that if you still have this distortion on the external screen, then you can change your backlight.
Need to change You see, your video card is broken. When an inverter breaks, it is normal for it to slow down and you can light up your screen for a while before it gets dark and then restart after restarting. It will be over again shortly. However, time is not the only rule to make an accurate diagnosis. Instead, they are usually an experienced symptom.
To make an accurate diagnosis, you should check your inverter and background. There are special tools for testing inverters, but they can be quite expensive. Also, I do not recommend testing the inverter with a multimeter, as the voltage supplied by the inverter may increase.
First of all, to test your backlight and inverter, you should have another laptop with a fully functional screen that you can easily open. In general, connectors are the same on all laptops, so they do not have to be the same model or brand.
Now, you need to access your laptop screen. To do this, remove the rubber screw caps around the screen with a flat head screwdriver and place them on the wax paper to secure the glue. After that, remove all the patches around the screen and keep them in a safe place. Do this and the next step on a working laptop is what you will use to diagnose the error.
Then, move your finger around the screen to remove the bezel.
After removing the bezel, you should see a small panel protruding from at least 2 cables at the bottom of the screen. This is an inverter. A cable comes from the base of the laptop and provides DC power to the inverter. Other cables (cables) come out of the screen and connect to the backlight. If you see more than one cable on your screen connected to your inverter, it means that your laptop has several backlights.
Once the screens of your damaged laptop and test laptop pop up, we will check the inverter of the damaged laptop. To do this, on both laptops, remove the cable from each screen to the inverter. Do not remove the cable from the base of the laptop to the inverter. Keep the two laptops close together and connect the light cable to the test laptop inverter on the faulty laptop. Turn on both laptops.
If everything on the bad laptop looks bright as usual and does not dim again after a while, then you should replace the inverter on your bad laptop. At this point you have completed the diagnosis of the problem and do not need to go further with this article. If the screen of the damaged laptop is still dim and you can still see only a blurry outline of objects on the screen, then you should change your backlight.
However, we do not want to stop there. We also need to check the inverter of the bad laptop.