Lcd Built-In Self Test; Diagnostic Leds - Dell Latitude 5300 Service Manual

8. Powerwash may take some time to complete. Let the screen transition to Chrome Operating System welcome screen and make sure
you sign in with your primary Google Account, because this account is set as the owner account.

LCD Built-in Self Test

Overview : 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, color fade
etc., it is always a good practice to isolate the LCD (screen) by running the built-in self test (BIST).
How to invoke LCD BIST Test
1. Power off the Dell laptop PC.
2. Disconnect any peripherals connected to the PC. Connect only the AC adapter (charger) to the PC.
3. Make sure that the LCD (screen) is clean (no dust particles on the surface of the screen).
4. 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 color
bars on the LCD (screen).
5. The screen will display multiple color bars and change colors on the entire screen to red, green and blue.
6. Carefully inspect the screen for abnormalities.
7. Press Esc key to exit.
NOTE: Dell ePSA upon launch, initiates a LCD BIST first, expecting an user intervention confirm functionality of the
LCD.

Diagnostic LEDs

Instead of beep codes, errors are indicated via the bicolor Battery Charge/Status LED. A specific blink pattern is followed by flashing a
pattern of flashes in amber, followed by white. The pattern then repeats.
NOTE: The diagnostic pattern will consist of a two-digit number being represented by a first group of LED blinks (1
through 9) in amber, followed by a 1.5 second pause with the LED off, and then a second group of LED blinks (1 through
9) in white. This is then followed by a three second pause, with the LED off, before repeating over again. Each LED blink
takes 1.5 seconds.
The system will not shutdown when displaying the Diagnostic Error Codes.
Diagnostic Error Codes will always supersede any other use of the LED. For instance, on Notebooks, battery codes for Low Battery or
Battery Failure situations will not be displayed when Diagnostic Error Codes are being displayed.
106 Troubleshooting