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Latitude 5455 Owner's Manual

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LCD Power rail test (L-BIST)

L-BIST is an enhancement to the single LED error code diagnostics and is automatically initiated during POST. L-BIST checks the LCD power rail. If there is no power supplied to the LCD (that is if the L-BIST circuit fails), the battery-status light flashes either error code [1,3], [1,4], or [2,8].

NOTE:If L-BIST fails, LCD-BIST cannot function as no power is supplied to the LCD.

How to invoke the L-BIST Test

  1. Press the power button to start the computer.
  2. If the computer does not start up, check the battery-status light:
    • If the battery-status light flashes an error code [1,3] or [1,4], the display cable may not be connected properly.
    • If the battery-status light flashes an error code [2,8], there is a failure on the LCD power rail of the system board, hence there is no power that is supplied to the LCD.
  3. For cases, when a [1,3] or [1,4] error code is shown, check if the display cable is properly connected.
  4. For cases when a [2,8] error code is shown, replace the system board.

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