Precision 5570 Service Manual

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.

Press and hold both the M key on the keyboard and the power button to initiate M-BIST.
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.

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	Possible Problem
2	1	CPU Failure
2	8	LCD Power Rail Failure
1	1	TPM Detection Failure
2	4	Memory/RAM failure

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.