Display Panel Power Rail Built-In Self-Test (L-Bist); Display Panel Built-In Self-Test (Lcd-Bist) - Dell Vostro 5401 Service Manual

Display panel power rail built-in self-test (L-BIST)

About this task
Next steps
L-BIST (LCD Power Rail Test) is an enhancement to the single LED error code diagnostics and is automatically initiated
during POST. L-BIST isolates if the LCD is receiving power from the system board. L-BIST checks if the system board is
supplying power to the LCD by performing an LCD Power Rail test. If there is no power going to the LCD, the battery status
LED flashes a [2,8] LED error code.

Display panel built-in self-test (LCD-BIST)

About this task
Steps
1. Press and hold the D key, and then press the power button.
2. Release both the D key and the power button when the computer begins POST.
3. The display panel begins to display a solid color, or cycling through different colors.
Troubleshooting 117