Dell XPS 13 9315 2-in-1 Manual de serviço - Página 34
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Built-in self-test (BIST)
M-BIST
M-BIST (Built In Self-Test) is the system board's built-in self-test diagnostics tool that improves the diagnostics accuracy of
system board embedded controller (EC) failures.
NOTE:
M-BIST can be manually initiated before POST (Power On Self Test).
How to run M-BIST
NOTE:
M-BIST must be initiated on the system from a power-off state either connected to AC power or with battery only.
1. Press and hold volume-up button and press the power button to initiate M-BIST. The service LED indicator may exhibit
these states:
NOTE:
The service LED indicator is located on the display panel near to the USB-C ports.
a. OFF: No fault detected with the system board
b. AMBER: Indicates a problem with the system board
2. If there is a failure with the system board, the service LED indicator will display one of the following error codes for 30
seconds:
Table 20. LED error codes
Blinking pattern
Amber
2
2
1
2
3. If there is no failure with the system board, the LCD will cycle through the solid color screens described in the LCD-BIST
section for 30 seconds and then power off.
LCD Built-in Self Test (BIST)
Dell laptops 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 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 computer.
2. Disconnect any peripherals that are connected to the laptop. Connect only the AC adapter (charger) to the computer.
3. Ensure that the LCD (screen) is clean (no dust particles on the surface of the screen).
4. Press and hold volume-down button and press the power button to enter LCD built-in self test (BIST) mode. Continue to
hold both buttons down until the system boots up.
5. The screen will display solid colors and change colors on the entire screen to white, black, red, green, and blue twice.
6. Then it will display the colors white, black and red.
7. Carefully inspect the screen for abnormalities (any lines, fuzzy color or distortion on the screen).
8. At the end of the last solid color (red), the system will shut down.
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Troubleshooting
White
1
8
1
4
Possible Problem
CPU Failure
LCD Power Rail Failure
TPM Detection Failure
Unrecoverable SPI Failure