- Notes, cautions, and warnings
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Dell Precision 5520 Owner's Manual
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.
- Press and hold both the M key on the keyboard and the power button to initiate M-BIST.
- With both the
M key and the power button held down, the battery indicator LED may exhibit two states:
- OFF: No fault detected with the system board
- AMBER: Indicates a problem with the system board
- If there is a failure with the system board, the battery status LED will flash one of the following error codes for 30 seconds:
Table 1. LED error codesLED error codes Blinking Pattern Possible Problem Amber White 2 1 CPU Failure 2 8 LCD Power Rail Failure 1 1 TPM Detection Failure 2 4 Unrecoverable SPI Failure - 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.
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