Troubleshooting light leakage / bleeding on a LCD Monitor or Notebook LCD Screen

Troubleshooting light leakage / bleeding on a LCD Monitor or Notebook LCD Screen



The following article deals with troubleshooting either light leakage or backlight bleeding on your Dell Monitor or Notebook LCD screen. (This error is often noticeable around the edges and / or the side areas while displaying a dark background or in a dark environment.")

Ideally light leakage should not be inspected in dark room. All monitors are inspected as per industry standard with 150Lux ambient lighting (similar to typical office lighting). Any visual inspection should be done in the same manner to help with the troubleshooting process.


Table of Contents:

  1. Identifying a light issue with your Monitor or Notebook screen
  2. Troubleshooting a light issue with your Monitor or Notebook screen
  3. Links to related information

Identifying a light issue with your Monitor or Notebook Screen

Note: This article deals with a common issue seen on LCD screens. It is not something specific to a particular Dell system, but is something that can be seen on any LCD screen by any manufacturer.

Before carrying on with the troubleshooting section of this article, it is important you identify if it is this issue you are experiencing. Check your issue against the examples below and ensure this is the correct article for you. If not please check the links to related information in the section below to find another article that might match your situation better.

These issues can be seen on either LCD Monitors or Notebook LCD screens:

  • Light leaks from the corners:
  • X
  • Light leaks from the centre of the top and bottom edges:
  • X
  • The entire screen is lit with light from the centre of each edge:
  • X
  • Multiple leaks along bottom edge of the screen:
  • X


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Troubleshooting a light issue with your Monitor or Notebook screen

Troubleshooting steps:

  1. If you change the brightness level of the screen does it change what's happening on the screen?

    1. If it does, then it could be a settings issue with how you've configured the screen.

    2. If it doesn't, then carry on to the next step.

  2. Check the screen with a bright application (such as Microsoft Office) open, something with a bright background. Do you see the same issue? (take a picture you can use to illustrate what the issue onscreen looks like to another person.)

    1. If you can't, it could be an issue with the brightness level in your screen settings.

    2. If you can, snap a picture and carry on to the next step.

  3. Compare the screen to other monitors or screens of the same model. Put a similar image on both screens, (preferably not a dark or mostly black image) is one screen notably worse than the other?

    1. If the screens do not show any appreciable difference, then the issue is more likely to be with the users perception than any real technical issue.

    2. If the screens do show your screen is appreciably worse than another similar screen, then contact your support, if possible with a picture of the fault, so that the technician can further assist you.

Note: Please be aware that some light leakage is to be expected when viewing images with dark backgrounds in dark rooms.


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Links to related information

The following links take you to some articles that deal with other situations facing screens:

The following links take you to some articles that deal with other situations facing monitors:

If you require further assistance, please contact Technical Support
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Article ID: SLN304886

Last Date Modified: 03/20/2019 10:39 AM


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