Table 21. LED codes(continued)
Diagnostic light codes
(Amber, white)
Problem description
2,8 Display failure - EC detection of power rail
failure
3,1 CMOS battery failure
3,2 PCI, video card/chip failure
3,3 BIOS recovery image not found
3,4 Recovery image found but invalid
3,5 Power-rail failure
3,6 System BIOS Flash incomplete
3,7 Management Engine (ME) error
4,1 Battery charging failure
Camera status light: Indicates whether the camera is in use.
● Solid white — Camera is in use.
● Off — Camera is not in use.
Caps Lock status light: Indicates whether the Caps Lock is enabled or disabled.
● Solid white — Caps Lock enabled.
● Off — Caps Lock disabled.
Built-in self-test (BIST)
About this task
There are three different types of BIST to check the performance of display, power rail, and system board. These tests are
important to evaluate if an LCD or system board needs a replacement.
1. M-BIST: M-BIST is the system board built-in self-test diagnostics tool that improves the diagnostics accuracy of system
board embedded controller (EC) failures. M-BIST must be manually initiated before POST and can also run on a dead
system .
2. L-BIST: L-BIST is an enhancement to the single LED error code diagnostics and is automatically initiated during POST.
3. LCD-BIST: LCD BIST is an enhanced diagnostic test that is introduced through Preboot System Assessment (PSA) on legacy
systems.
Table 22.
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 the 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.
Troubleshooting 79
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