Table 20. Functions
M-Bist L-Bist
Purpose Evaluates the health condition of the
system board.
Checks if the system board is supplying
power to the LCD by performing an LCD
Power Rail test.
Trigger Press the <M> key and power button. Integrated into the single LED error
code diagnostics. Automatically initiated
during POST.
Indicator of fault Battery LED light with Solid Amber. Battery LED error code of [2,8] blinks
Amber x2, then pause, then blinks White
x8.
Repair instruction Indicates a problem with the system
board.
Indicates a problem with the system
board.
System board built-in self-test (M-BIST)
About this task
Steps
1. Press and hold both the M key and the power button to initiate M-BIST.
2. The battery-status light illuminates in amber when there is a system board failure.
3. Replace the system board to fix the issue.
NOTE: The battery status LED does not illuminate if the system board is functioning properly.
Display panel power rail built-in self-test (L-BIST)
About this task
120
Troubleshooting
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