Dell Latitude 3500 Priročnik za servisiranje

L-BIST

L-BIST (LCD Power Rail Test) je izboljšava diagnostike s kodami napak z eno lučko LED in se samodejno sproži med preskusom POST. L-BIST preveri napajalni vod za LCD. Če LCD nima napajanja (torej vezje L-BIST ne deluje), bo LED za stanje baterije utripala s kodo napake [2,8].

OPOMBA: Če preskus L-BIST ne uspe, LCD-BIST ne more delovati, ker ni napajanja za LCD.

Running the L-BIST

  1. Press the power button to start up the system.
  2. If the system does not start up normally, look at the battery status LED. If the battery status LED flashes an error code [2,8], there is a failure on the LCD power rail of the system board, hence there is no power supplied to the LCD.
  3. Replace the system board in this case.

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