Dell Alienware M16 R2 Owners Manual - Page 106

Built-in self-test (BIST), M-BIST, LCD Power rail test (L-BIST)

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Built-in self-test (BIST) 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: M-BIST must be initiated on the computer from a power-off state that is either connected to AC power or with a battery only. 1. Press and hold both the M key on the keyboard and the power button to initiate M-BIST. 2. The battery indicator LED may exhibit two states: a. OFF: No fault was detected with the system board. b. AMBER: Amber indicates a problem with the system board. 3. If there is a failure with the system board, the battery status LED flashes one of the following error codes for 30 seconds: Table 46. LED error codes Blinking Pattern Amber 2 2 White 1 8 Possible Problem CPU Failure 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 section for 30 seconds and then turn off. LCD Power rail test (L-BIST) L-BIST is an enhancement to the single LED error code diagnostics and is automatically initiated during POST. L-BIST will check the LCD power rail. If there is no power being supplied to the LCD (that is if the L-BIST circuit fails), the battery status LED flashes either an error code [2,8] or an error code [2,7]. NOTE: If L-BIST fails, LCD-BIST cannot function as no power will be supplied to the LCD. How to invoke the L-BIST Test: 1. Press the power button to start the computer. 2. If the computer does not start up normally, look at the battery status LED: ● If the battery status LED flashes an error code [2,7], the display cable may not be connected properly. ● If the battery status LED flashes an error code [2,8], there is a failure on the LCD power rail of the system board, hence there is no power that is supplied to the LCD. 3. For cases, when a [2,7] error code is shown, check to see if the display cable is properly connected. 4. For cases when a [2,8] error code is shown, replace the system board. 106

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Built-in self-test (BIST)
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:
M-BIST must be initiated on the computer from a power-off state that is either connected to AC power or with a battery
only.
1.
Press and hold both the
M
key on the keyboard and the
power button
to initiate M-BIST.
2.
The battery indicator LED may exhibit two states:
a.
OFF: No fault was detected with the system board.
b.
AMBER: Amber indicates a problem with the system board.
3.
If there is a failure with the system board, the battery status LED flashes one of the following error codes for 30 seconds:
Table 46. LED 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
section for 30 seconds and then turn off.
LCD Power rail test (L-BIST)
L-BIST is an enhancement to the single LED error code diagnostics and is automatically initiated during POST. L-BIST will check the
LCD power rail. If there is no power being supplied to the LCD (that is if the L-BIST circuit fails), the battery status LED flashes
either an error code [2,8] or an error code [2,7].
NOTE:
If L-BIST fails, LCD-BIST cannot function as no power will be supplied to the LCD.
How to invoke the L-BIST Test:
1.
Press the power button to start the computer.
2.
If the computer does not start up normally, look at the battery status LED:
●
If the battery status LED flashes an error code [2,7], the display cable may not be connected properly.
●
If the battery status LED flashes an error code [2,8], there is a failure on the LCD power rail of the system board, hence there
is no power that is supplied to the LCD.
3.
For cases, when a [2,7] error code is shown, check to see if the display cable is properly connected.
4.
For cases when a [2,8] error code is shown, replace the system board.
106