Dell Precision 5520 LCD issue

sergiob12,

Click the links below to resolve LCD issues.

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

Common Issues with Video on Notebook LCD Screens

Resolving Laptop LCD Issues

Thanks. I've done all of that except connecting to an external monitor, as I don't have one, and I still see the issue.

sergiob12,

Run the LCD BIST test by following the information below. 

 Laptop LCD Built-In Self Test

To run the Built-In Self-Test perform the following:

Method 1

1. Turn the computer off.
2. Press and hold the D key while pressing the power button. This will start the Laptop LCD BIST.
3. The screen will display multiple flashing colors. Look for lines, distortion, or any other video issues you have observed.
4. The laptop will restart when the test is finished.

Method 2

1. Turn the computer off.
2. Press and hold the Fn key and power on your laptop while holding down the Fn key. This will start the Dell Pre-Boot System Assessment.
3. Your computer will now run a series of tests.
4. When your computer displays a series of horizontal and vertical color bars, it will prompt you with a pop-up message "Do you see the color bars? Yes / No
5. Press the N key to enter the Laptop LCD BIST. Note: If you do not respond for 30 seconds, the diagnostics will automatically assume your response as a 'No' and proceed to the Laptop LCD Built-In Self Test.
6. The screen will display multiple flashing colors. Look for lines, distortion, or any other video issues you have observed.
7. The laptop will restart when the test is finished.