Dell Vostro 5590 Service Manual - Page 78

M-BIST, System diagnostic lights - manual

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Indicator of fault Repair instruction M-BIST L-BIST Battery LED light with "Solid Amber" Battery indicator LED blink error code [Amber, White] = [2,8] Indicates a problem with the system Indicates a problem with the system board. board. M-BIST M-BIST is the system board's built-in self-test diagnostics tool that improves the diagnostics accuracy of system board embedded controller (EC) failures. M-BIST can be manually initiated before POST. NOTE: M-BIST can be manually initiated before POST(Power On Self Test). How to run M-BIST? M-BIST must be initiated on the system from a power-off state that is either connected to AC power or with battery only. 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 thepower button that is held down, the battery indicator LED may exhibit two states. a. OFF: No fault detected with the system board. b. SOLID AMBER: Indicates a problem with the system board. L-BIST L-BIST (LCD Power Rail Test) is an enhancement to the single LED error code diagnostics and is automatically initiated during POST. LBIST will check the LCD power rail. If there is no power being supplied to the LCD (i.e., the L-BIST circuit fails), the battery status LED will flash an error code [2,8]. NOTE: If L-BIST fails, LCD-BIST cannot function as there is no power being supplied to the LCD. Running the L-BIST 1. Press the power button to start up the system. 2. If the system does not start up normally, look at the battery status LED. 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 supplied to the LCD. 3. Replace the system board in this case. System diagnostic lights Battery-status light Indicates the power and battery-charge status. Solid white - Power adapter is connected and the battery has more than 5 percent charge. Amber - Computer is running on battery and the battery has less than 5 percent charge. Off • Power adapter is connected and the battery is fully charged. • Computer is running on battery and the battery has more than 5 percent charge. • Computer is in sleep state, hibernation, or turned off. The power and battery-status light blinks amber along with beep codes indicating failures. For example, the power and battery-status light blinks amber two times followed by a pause, and then blinks white three times followed by a pause. This 2,3 pattern continues until the computer is turned off indicating no memory or RAM is detected. The following table shows different power and battery-status light patterns and associated problems. 78 Troubleshooting

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M-BIST
L-BIST
Indicator of fault
Battery LED light with "Solid Amber"
Battery indicator LED blink error code [Amber, White] =
[2,8]
Repair instruction
Indicates a problem with the system
board.
Indicates a problem with the system board.
M-BIST
M-BIST is the system board's built-in self-test diagnostics tool that improves the diagnostics accuracy of system board embedded
controller (EC) failures. M-BIST can be manually initiated before POST.
NOTE:
M-BIST can be manually initiated before POST(Power On Self Test).
How to run M-BIST?
M-BIST must be initiated on the system from a power-off state that is either connected to AC power or with battery only.
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.
SOLID AMBER:
Indicates a problem with the system board.
L-BIST
L-BIST (LCD Power Rail Test) 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 (i.e., the L-BIST circuit fails), the battery status LED will
flash an error code [2,8].
NOTE:
If L-BIST fails, LCD-BIST cannot function as there is no power being supplied to the LCD.
Running the L-BIST
1.
Press the power button to start up the system.
2.
If the system does not start up normally, look at the battery status LED. 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 supplied to the LCD.
3.
Replace the system board in this case.
System diagnostic lights
Battery-status light
Indicates the power and battery-charge status.
Solid white
— Power adapter is connected and the battery has more than 5 percent charge.
Amber
— Computer is running on battery and the battery has less than 5 percent charge.
Off
•
Power adapter is connected and the battery is fully charged.
•
Computer is running on battery and the battery has more than 5 percent charge.
•
Computer is in sleep state, hibernation, or turned off.
The power and battery-status light blinks amber along with beep codes indicating failures.
For example, the power and battery-status light blinks amber two times followed by a pause, and then blinks white three times followed by
a pause. This 2,3 pattern continues until the computer is turned off indicating no memory or RAM is detected.
The following table shows different power and battery-status light patterns and associated problems.
78
Troubleshooting