Dell 14 Plus 2-in-1 DB04255 Owner's Manual

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Motherboard Built-In Self-Test (M-BIST)

M-BIST is the system board onboard 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 and the power button to initiate M-BIST.
  2. The battery-status light may exhibit two states:
    • Off: No fault was detected.
    • Amber and White: Indicates a problem with the system board.
  3. If there is a failure with the system board, the battery-status light 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) for 30 seconds and then turn off.

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