Troubleshooting a dim laptop screen #3
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One morning you wake up and see your laptop screen black. However, the fans are clearly turning on the computer so that it is still functioning. As panic sets in, you begin to wonder what is wrong. If you examine the screen closely, you will see a faint outline. You can also shine a flashlight onto it to almost discern all of the text and images.
This is a common problem for laptop screens. There are two possible causes: either the backlight of your screen has gone out or the inverter. The back light, which is basically a fluorescent lamp that lights up your screen enough to allow you to see all the details clearly, is basically a fluorescent bulb. Sometimes, these bulbs can fail, which can cause your computer's screen not to show any objects at all. If the inverter of your back light goes bad, it will show the same symptoms as the original back light. Inverters are used to convert the DC power from your laptop's battery to AC power. This is what your backlight requires to function. The inverter can go bad and the correct voltage won't be delivered to the backlight, which will cause a dimming screen. There are two possible ways to tell if your screen is acting badly. A bad back light will cause the screen to not glow at all or to appear reddish. For best and top structured cabling services contact ATOP Computer Solutions: https://www.acs-dxb.com/services/structure-cabling
If this happens, you can easily rule out that your video card is to blame. You can test for a video card by connecting an external monitor to the VGA port on your laptop's back. If you don't see color distortions after plugging in an external monitor, it is likely that your backlight needs to be replaced. If you see the same distortions when you plug in the external monitor, your video card may have been damaged. It is not uncommon for an inverter to start to fail slowly. Your screen will dim for a brief time, then re-illuminate after rebooting. These are not the only rules to be used for diagnosing an issue. They are more common symptoms. You must first test your back light and inverter to get an accurate diagnosis. Although there are tools available that can specifically test the inverter they can be quite expensive. A multimeter is not recommended for testing an inverter, since the voltage supplied can be quite high.
To test your inverter and back light, you will need another laptop with a functioning screen that you are comfortable opening. You don't have to use the exact same model or brand. The connectors work on all laptops.
You will now need to gain access the screen of your laptop. You will need to remove the rubber screws covering the screen using a flat-head screwdriver. Next, place the glue side down on waxed paper to preserve the glue. Next, take out all the screws from the screen and put them in a safe place. Next, remove all screws from the screen and place them in a safe spot.
Next, slide your finger under the bezel and around the screen until you are done.
After you have removed your bezel, you will see a small piece of board at the bottom of the screen. It should have at least two cables sticking out. This is the inverter. The inverter receives DC power from one cable that comes from the laptop's base. The other cables are inserted from the screen and connect to the back lights. Your laptop may have multiple back lights if you see more than one cable from your screen to connect to your inverter. Tap here for all the information related to IT Products solutions
After both the screens on your damaged laptop and the testing laptop are exposed, we will test inverters on the damaged laptop. You will need to remove the cables connecting each screen to the inverter from both your laptops. The cable connecting the laptop's base to the inverter should not be removed. Place the laptops next to each other. Then plug the cable from the laptop base to the inverter with the back light on the damaged laptop. Both laptops should be turned on. You must replace the inverter of your damaged laptop if you can see the normal brightness on both laptops. You have now completed diagnosing the problem and can move on to this article. If your laptop's screen remains dimming and you are unable to see any objects on it, the back light(s), if any, must be replaced.
We don't want it to end there. To make sure the inverter is not damaged, we must also test it. First, turn off both laptops. Next, unplug the damaged laptop's backlight plug from its inverter. Next, plug in the backlight of the test laptop to the damaged laptop's transformer. Both laptops should be turned on. If your test laptop's screen shows no dimming, it is likely that your inverter is fine and doesn't need to be replaced. If your screen on your test laptop is dimming like the damaged laptop's, then you must replace your inverter.