How to Run the LCD Built-in Self-Test on a Dell Laptop

Summary: This article provides information about how to run the LCD built-in self-test (BIST) diagnostics on a Dell laptop. The LCD built-in self-test (BIST) diagnostic helps analyze andSee more

Article Content


Symptoms

Run the LCD BIST to See if the Video Distortion Issue is Present

Duration: 00:21
Closed captions: English only


If the LCD screen on a Dell laptop is experiencing any of the following symptoms, running a diagnostic test can help identify if the display issue is inherent to the LCD screen.

  • Flickering
  • Blurry, fuzzy, or distorted image
  • Horizontal or vertical lines
  • Geometric distortion or skewed image
  • Distorted or fading colors
  • Bright or dead pixels
  • Light leak
  • Image burn, bright, or black patch
  • Bubbles or air pockets

If the display issue is with a Dell monitor, see the Dell knowledge base article How to Run a Diagnostic Test on a Dell Monitor.

Cause

Display or video issues can be caused due to outdated graphics drivers, hardware failure (LCD screen), or incorrect video settings on the computer.

Running a diagnostic test on the LCD screen helps identify if the issue is an inherent hardware problem with the LCD screen.

Resolution

LCD Built-in Self-Test (BIST)

Dell laptops have a built-in diagnostic tool that helps determine if the screen abnormality is an inherent problem with the LCD screen of the Dell laptop, the video card (GPU), or the display settings on the computer. If you notice screen abnormalities like flickering, distortion, clarity issues, fuzzy or blurry images, horizontal or vertical lines, color fade, bubbles, and so on, it is a good practice to isolate the LCD screen by running a diagnostic test. The LCD built-in self-test can be initiated in two ways:

Method 1

  1. Turn off the computer.
  2. Disconnect any devices that are connected to the computer.
  3. Connect the AC adapter (charger) to the computer.
  4. Ensure that the LCD screen is clean (no dust particles on the surface of the screen).
  5. Press and hold the D key and turn on the computer to enter LCD built-in self-test (BIST) mode. Continue to hold the D key, until you see color bars on the LCD screen.
  6. The screen displays multiple color bars and changes colors to black, white, red, green, and blue.
  7. Carefully inspect the screen for abnormalities.
  8. Press the Esc key to exit.
  9. If the screen abnormality is not present in the built-in self-test mode, see the Dell knowledge base article How to Troubleshoot Display or Video Issues on a Dell Laptop.
  10. If the screen abnormality is present in the built-in self-test mode, contact Dell Technical Support for repair options available at your location.

Method 2

  1. Turn off the computer.
  2. Disconnect any devices that are connected to the computer.
  3. Connect the AC adapter (charger) to the computer.
  4. Ensure that the LCD screen is clean (no dust particles on the surface of the screen).
  5. Press and hold the Fn key and turn on the computer to enter the preboot diagnostics mode. Continue to hold the Fn key, until you see the preboot diagnostic screen.
    NOTE: SupportAssist Pre-boot System Assessment or Enhanced Pre-Boot System Assessment (ePSA) diagnostic test checks the hardware and reports any hardware errors. Make a note of the error code or error message, validation code, and contact Dell Technical Support for repair options available in your location.
  6. When you see the message "Do you see the color bars? Yes/No", press the N key to enter LCD built-in self-test mode.
    NOTE: If you do not respond for 30 seconds, the diagnostic test assumes your response as No and enters the LCD built-in self-test (BIST).
  7. The screen displays multiple color bars and changes colors to black, white, red, green, and blue.
  8. Carefully inspect the screen for abnormalities.
  9. The computer restarts after the remaining tests are completed.
  10. If the screen abnormality is not present in the built-in self-test mode, see the Dell knowledge base article How to Troubleshoot Display or Video Issues on a Dell Laptop.
  11. If the screen abnormality is present in the built-in self-test mode, contact Dell Technical Support for repair options available at your location.

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Additional Information

Maintenance Guidelines

To learn more about best practices on handling and using a Dell laptop, see the Dell knowledge base article Best Practices for Product Use and Handling for Dell Laptops.

To learn more about general maintenance guidelines, see the Dell knowledge base article General Maintenance Guidelines For a Dell Computer.

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Safety Instructions

For displays with glossy bezels, consider the placement of the display as the bezel may cause disturbing reflections from surrounding light and bright surfaces.

WARNING: Use of controls, adjustments, or procedures other than what is specified in the User Manual may result in exposure to shock, electrical hazards, and/or mechanical hazards.

To learn more about safety instructions, see the Dell knowledge base article Safety Precautions When Working with Electronic and Electrical Equipment.

For FCC notices (U.S. only) and other regulatory information, see the regulatory compliance website www.dell.com/regulatory_compliance.

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Frequently Asked Questions

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  1. Browse to Dell Manuals website.
  2. Identify your Dell monitor:
    1. Enter the model number or Service Tag of the monitor, and then click Search.
    2. Or, click Browse all products, select Electronics & Accessories, Monitors & Accessories, and select your Dell monitor from the catalog.
  3. Under the Documentation tab, scroll to the Manuals and Documents section and click View PDF next to the monitors User Guide.
  4. In the User Guide, under the Troubleshooting section, scroll to the Built-in diagnostics page.
  5. Follow the instructions to run the built-in self-test on the Dell monitor.
  6. If the screen abnormality is not present in the built-in self-test mode, see the Dell knowledge base article How to Troubleshoot Display or Video Issues on a Dell Monitor.
  7. If the screen abnormality is present in the built-in self-test mode, contact Dell Technical Support for repair options.

Running an LCD built-in self-test (BIST) diagnostic test on the laptop is a good practice to isolate LCD screen issues.

If the LCD built-in self-test (BIST) diagnostic test passed, the laptop LCD screen is working correctly. The display problem could be due to an outdated graphics driver or incorrect video settings. Follow the troubleshooting instructions in the Dell knowledge base article How to Troubleshoot Display or Video Issues on a Dell Laptop.

If the LCD built-in self-test (BIST) diagnostic test failed, contact Dell Technical Support for repair options available in your location.

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Videos

How to run LCD built-in self-test on a Dell laptop

Duration: 00:24
Closed captions: English only

Article Properties


Affected Product

Laptops

Product

Chromebook, G Series, Alienware, Inspiron, Latitude, Vostro, XPS, Retired Models

Last Published Date

27 May 2021

Version

7

Article Type

Solution

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