Dell Latitude 9440 2-in-1 Service Manual

Also see for Latitude 9440 2-in-1: Setup and specifications

Dell SupportAssist Pre-boot System PerformanceCheck diagnosticsAbout this taskSupportAssist diagnostics (also known as system diagnostics) performs a complete check of your hardware. The DellSupportAssist Pre-boot System Performance Check diagnostics is embedded with the BIOS and is launched by the BIOSinternally. 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 testingNOTE: Some tests for specific devices require user interaction. Always ensure that you are present at the computerterminal when the diagnostic tests are performed.For more information, see https://www.dell.com/support/kbdoc/000180971.Running the SupportAssist Pre-Boot System Performance CheckSteps1. 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.Built-in self-test (BIST)M-BISTM-BIST (Built In Self-Test) is the system board's built-in self-test diagnostics tool that improves the diagnostics accuracy ofsystem board embedded controller (EC) failures.NOTE: M-BIST can be manually initiated before POST (Power On Self Test).How to run M-BISTNOTE: M-BIST must be initiated on the system from a power-off state 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 held down, the battery indicator LED may exhibit two states:a. OFF: No fault detected with the system boardb. AMBER: Indicates a problem with the system board3. If there is a failure with the system board, the battery status LED will flash one of the following error codes for 30 seconds:Troubleshooting 75