Dell Vostro 5490 Service Manual - Page 74

Troubleshooting, Enhanced Pre-Boot System Assessment (ePSA) diagnostics, Running the ePSA diagnostics - power supply

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4 Troubleshooting Enhanced Pre-Boot System Assessment (ePSA) diagnostics About this task The ePSA diagnostics (also known as system diagnostics) performs a complete check of your hardware. The ePSA is embedded with the BIOS and is launched by the BIOS internally. The embedded system diagnostics provides a set of options for particular devices or device groups allowing you to: • Run tests automatically or in an interactive mode • Repeat tests • Display or save test results • Run thorough tests to introduce additional test options to provide extra information about the failed device(s) • View status messages that inform you if tests are completed successfully • View error messages that inform you of problems encountered during testing NOTE: Some tests for specific devices require user interaction. Always ensure that you are present at the computer terminal when the diagnostic tests are performed. Running the ePSA diagnostics Steps 1. Turn on your computer. 2. As the computer boots, press the F12 key as the Dell logo appears. 3. On the boot menu screen, select the Diagnostics option. 4. Click the arrow at the bottom left corner. Diagnostics front page is displayed. 5. Click the arrow in the lower-right corner to go to the page listing. The items detected are listed. 6. To run a diagnostic test on a specific device, press Esc and click Yes to stop the diagnostic test. 7. Select the device from the left pane and click Run Tests. 8. If there are any issues, error codes are displayed. Note the error code and validation number and contact Dell. Diagnostics Table 15. Diagnostics Purpose of diagnostic tool Trigger M-BIST L-BIST Evaluates the health condition of the system board to have further resolution on "No Power", "No Post", and "No Video" symptom and reduce repeated dispatches. Checks if the system board is supplying power to the LCD display by performing an LCD Power Rail test, which allows for isolation of "No Video" symptom to Mainboard, LCD or Cable. Pressing M key and Power button Integrated into the single LED error code diagnostic. Automatically initiated during POST. 74 Troubleshooting

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Troubleshooting
Enhanced Pre-Boot System Assessment (ePSA)
diagnostics
About this task
The ePSA diagnostics (also known as system diagnostics) performs a complete check of your hardware. The ePSA is embedded with the
BIOS and is launched by the BIOS internally. The embedded system diagnostics provides a set of options for particular devices or device
groups allowing you to:
•
Run tests automatically or in an interactive mode
•
Repeat tests
•
Display or save test results
•
Run thorough tests to introduce additional test options to provide extra information about the failed device(s)
•
View status messages that inform you if tests are completed successfully
•
View error messages that inform you of problems encountered during testing
NOTE:
Some tests for specific devices require user interaction. Always ensure that you are present at the computer
terminal when the diagnostic tests are performed.
Running the ePSA diagnostics
Steps
1.
Turn on your computer.
2.
As the computer boots, press the F12 key as the Dell logo appears.
3.
On the boot menu screen, select the
Diagnostics
option.
4.
Click the arrow at the bottom left corner.
Diagnostics front page is displayed.
5.
Click the arrow in the lower-right corner to go to the page listing.
The items detected are listed.
6.
To run a diagnostic test on a specific device, press Esc and click
Yes
to stop the diagnostic test.
7.
Select the device from the left pane and click
Run Tests
.
8.
If there are any issues, error codes are displayed.
Note the error code and validation number and contact Dell.
Diagnostics
Table 15. Diagnostics
M-BIST
L-BIST
Purpose of diagnostic tool
Evaluates the health condition of the
system board to have further
resolution on "No Power", "No Post",
and "No Video" symptom and reduce
repeated dispatches.
Checks if the system board is supplying power to the
LCD display by performing an LCD Power Rail test, which
allows for isolation of "No Video" symptom to Mainboard,
LCD or Cable.
Trigger
Pressing
M
key and Power button
Integrated into the single LED error code diagnostic.
Automatically initiated during POST.
4
74
Troubleshooting