Latitude 5540 Owner's Manual

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M-BIST

M-BIST (Built In Self-Test) is the system board 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 Power On Self-Test (POST).

How to run M-BIST

NOTE: Before initiating M-BIST, ensure that the computer is in a power-off state.
  1. Press and hold both the M key on the keyboard and the power button to initiate M-BIST.
  2. The battery indicator LED may exhibit two states:
    1. OFF: No fault was detected with the system board.
    2. AMBER: Amber indicates a problem with the system board.
  3. If there is a failure with the system board, the battery status LED flashes 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 Memory/RAM failure
  4. If there is no failure with the system board, the LCD cycles through the solid color screens that are described in the LCD-BIST section for 30 seconds and then turn off.

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