Dell Vostro 5502 Service Manual - Page 85
Troubleshooting, Built-in self-test (BIST
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6 Troubleshooting Topics: • Built-in self-test (BIST) • System board built-in self-test (M-BIST) • Display panel power rail built-in self-test (L-BIST) • Display panel built-in self-test (LCD-BIST) • Outcome • SupportAssist diagnostics • Running the SupportAssist diagnostics • System diagnostic lights • Recovering the operating system • Flashing the BIOS • Flashing BIOS (USB key) • Backup media and recovery options • WiFi power cycle • Releasing Ethernet (RJ-45) cable Built-in self-test (BIST) About this task There are three different types of BIST to check the performance of display, power rail, and system board. These tests are important to evaluate if an LCD or System board needs a replacement. 1. M-BIST: M-BIST is the system board built-in self-test diagnostics tool that improves the diagnostics accuracy of system board embedded controller (EC) failures. M-BIST must be manually initiated before POST and can also run on a dead system . 2. L-BIST: L-BIST is an enhancement to the single LED error code diagnostics and is automatically initiated during POST. 3. LCD-BIST: LCD BIST is an enhanced diagnostic test that is introduced through Preboot System Assessment (PSA) on legacy systems. Table 19. Functions Purpose Trigger Indicator of fault Repair instruction M-Bist Evaluates the health condition of the system board. Press the key and power button. Battery LED light with Solid Amber. Indicates a problem with the system board. L-Bist Checks if the system board is supplying power to the LCD by performing an LCD Power Rail test. Integrated into the single LED error code diagnostics. Automatically initiated during POST. Battery LED error code of [2,8] blinks Amber x2, then pause, then blinks White x8. Indicates a problem with the system board. Troubleshooting 85