How To Test Laptop Screen Inverter

How To Test Laptop Screen Inverter
  • Sep 1st, 2023
  • Divya Sachdeva
  • How To
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Hello Friends, hope you are doing well!

The most important part of your laptop’s LCD screen assembly is your LCD screen inverter. Inside your LCD screen, the inverter is a little circuit board that provides power to your LCD’s backlight gadget. The LCD screen inverter illuminates the LCD screen which enables you to see images, illustrations, and videos on your screen. If your LCD screen inverter is not working properly you will see a dim or a complete black LCD screen.

If you want to test your laptop LCD inverter and you don’t know how to do it then you are at the right place.

This blog will tell you how to test a laptop LCD screen inverter.

Your latest laptop for Circuit makers should be powered up if you are unable to get anything on display and only see the actual light lighting up, if you are unable to see much on the screen and if you look closely you will be able to see a slight display or a little flash on the screen. In this case we suggest you to turn off your laptop. Then boot back up into the actual BIOS and try to get the BIOS to boot up on the screen. Then get a torch and flash it onto the actual screen to see if you can see any sort of display now.

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Sometimes you don’t see anything but only see a convenient and clean faint picture. You can actually see there is a little bit of a display there if you use the camcorder with the light on it. We then recommend that you remove all the actual bezel on the front by being careful. Just interfere around a little on the front by removing the actual bezel. After going inside have a look at the actual inverter part and the cable where you can see the cable going outside. If there is no display there then we need to do determine whether it is the inverter or the actual backlight that is gone on the actual laptop itself.

A little lamp kit should be used as it has a customization kit with LED lights. Use any type of laptop and you can see the actual cable which is going inside the inverter. You can bypass the inverter to make sure whether the inverter is broken. You can use little connectors and a 12-volt power source for lighting up the lamps. You can then plug out the inverter and plugin into your little device from where you go to your 12-volt power adapter and into the wall. If you are unable to get a display then the lamps are bad, however, if you get a display then it will be the actual inverter which is bad.

Then go to the 12-volt power adapter which is into the wall. If your lamps illuminate then your actual inverter is bad. Then switch on the lamps and you will see a very dim light that comes which is the actual light coming on the tubes. In this way, you can see the display. Now you know the actual inverter is bad and that the tube is good.

Now take a look at another screen. There you can actually use a known good screen of another laptop to see whether you have got a display there. Use multimeters for the actual inverter to see whether it is failed or you can use a known good inverter. These are some of the different ways of testing LCD Screen inverters. We are telling you one of the quick and simple ways of testing LCD screen inverters.

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When you give a quick look at the switch, you can see the light comes on and you will notice that it is either not good or it may be bright. From this, we know that the lamp is good, working and the LCD is also good. It is a good sign that the actual light is going on. It is not good if the actual light is not on the lamp.

The inverter gets its power from the motherboard, however, there is no light on the screen. Apparently, it will be either a failed backlight lamp or a bad inverter.

Use a known good backlight lamp for testing.

1. First unplug the screen backlight cable from the right side of the inverter.
2. Then connect a known good backlight lamp.

Then turn on your laptop.
1. If your test backlight turns on then the lamp inside the screen is bad. In this case, replace the screen and also replace the backlight lamp which is not easy and neither recommended.
2. If your test backlight doesn’t turn on then most likely you have an inverter failure. We recommend that you replace it and test the laptop again.

Read Also : How To Troubleshoot and Fix Blue Screen?


You can easily test your laptop’s LCD screen inverter by following this quick and easy method. We hope this blog will be useful for laptop users who don’t know how to test their LCD screen inverters.

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Frequently Asked Questions

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The backlight for the LCD screen in most laptops is a cold-cathode fluorescent lamp, which is basically just a small fluorescent tube. Just like fluorescent room lighting, they eventually burn out. Unlike room lighting, they are not made to be replaceable.

The liquid pixels within an LCD device don't illuminate on their own. Rather, they require illumination from a separate component, known as a backlight. The bottom line is that a backlight is an essential component in LCDs. Without a backlight, an LCD display device will remain black, rendering it unviewable.

To check if the PC has a backlight keyboard, check the keyboard Space button or Esc button. To see if a specific model has a backlight, search for backlight in the User Guide or Hardware Maintenance Manual (How to find and view manuals for Lenovo products - ThinkPad, ThinkCentre, ideapad, ideacentre).

Turn your television on and shine a flashlight on the screen to look for an image. If you can see an image, then you likely have a bad inverter that needs replacement. The inverter board keeps the backlight of the television on.

Desktop and laptop computer LCD monitors sport a long light bulb to display the video. When this bulb burns out, the screen dims to almost black. Failing backlights can also cause the picture to flicker, blink on and off or offer an odd color cast to the screen.

If your LCD backlight is not working consider the possibility of the LCD not lighting up because of the blown fuse on your laptop's motherboard. Imagine the following: You have an LCD that does not produce the backlight. You order and install the LCD with the new one, however, the backlight is still not functional.

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