How to Run Diagnostic Test on a Dell Laptop LCD?

LCD Built-in Self-Test (BIST)

Dell laptop PCs have a built-in diagnostic tool that helps you determine if the screen abnormality you are experiencing is an inherent problem with the LCD (screen) of the Dell laptop PC or with the video card (GPU) and PC settings.
When you notice screen abnormalities like flickering, distortion, clarity issues, fuzzy or blurry image, horizontal or vertical lines, colour fade etc., it is always a good practice to isolate the LCD (screen) by running the built-in self-test (BIST).

Method 1 - Run the laptop LCD built-in self-test (BIST)

Power off the Dell laptop PC. Disconnect any peripherals connected to the PC. Connect the AC adapter (charger) to the PC. Make sure that the LCD (screen) is clean (no dust particles on the surface of the screen). Press and hold D key and power on the PC to enter LCD built-in self-test (BIST) mode.
Continue to hold the D key, until you see colour bars on the LCD (screen) The screen will display multiple colour bars and change colours on the entire screen to red, green and blue. Carefully inspect the screen for abnormalities. Press Esc key to exit.

Method 2 - Run the laptop LCD built-in self-test (BIST)

Power off the Dell laptop PC. Disconnect any peripherals connected to the PC. Connect the AC adapter (charger) to the PC.

Make sure that the LCD (screen) is clean (no dust particles on the surface of the screen).

Press and hold FN key and power on the PC to enter ePSA or PSA diagnostics mode.
Continue to hold the FN key, until you see the ePSA or PSA diagnostic screen. EPSA or PSA will run a series of tests on the PC. Press N key to enter LCD built-in self-test mode when you see the message "Do you see the colour bars? Yes/No". The screen will display multiple colour bars and change colours on the entire screen to black, white, red, green and blue.

Carefully inspect the screen for abnormalities. The PC will restart once the remaining tests are completed.

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