1 Press and hold both the M key on the keyboard and the power button to initiate M-BIST.
2 With both the M key and the power button that is held down, the battery indicator LED may exhibit two states:
a OFF: No fault detected with the system board
b AMBER: Indicates a problem with the system board
Self-Heal
Course Introduction
Self-Heal is an option that helps recover a Dell Latitude system from a No Post, No Power, No Video situation.
Self-Heal Instruction
1 Remove the primary battery and the AC adapter.
2 Disconnect the CMOS battery.
3 Release the ea power. Press and hold the power button down for 10 seconds or leave the system idle for 45 seconds.
4 Make sure the CMOS and primary battery are not plugged into the system.
5 Plug in the AC adapter. The system will auto power-on when the AC adapter inserted.
6 The system will start with a blank screen for a while and will shut down automatically. Watch for the LED lights (power, Wi-Fi, and
HDD). It will turn on.
7 The system will try to restart twice and will boot on the third attempt.
8 Place the CMOS battery and the AC adapter back in the system.
9 If self-heal recovers the failure, update the system with the latest BIOS, and perform ePSA to ensure proper functionality of the
system.
NOTE
:
• During installation or removal of any hardware, always ensure all data is backed up properly.
• For instructions on how to remove or replace parts, visit the Assembly Disassembly.
• Before beginning to work on the computer, follow the Safety Instructions.
Supported Latitude Models
NOTE
:
• Before replacing the system board, perform self-heal as a mandatory step.
• Latitude Self-Heal can be avoided when complete system tear-down is required to access the coin-cell battery.
• For the Latitude E7 Series (XX70), BIOS Recovery 2.0 should be performed as the primary step.
• In order to reduce troubleshooting time associated with Self-Heal, there is no mandatory requirement to reassemble the system.
Technicians can initiate Self-Heal even with the system board exposed.
• Do not touch any of the exposed components or the system board to avoid shorting and static.
• If Self-Heal is unable to recover the failure, proceed with replacing the system board.
Diagnostics 145
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