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Certain Inspiron Systems Require the AC Adapter Attached to Run LCD Built-In Self Test

Summary: This article provides information about certain Inspiron laptops not being able to run the LCD built-in self test (BIST) unless the AC adapter is connected.

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Article Content



Select Dell Inspiron laptops will not enter the LCD built-in self test (BIST) diagnostics when using the D and Power button key combination. On these laptops, the AC adapter must be connected to start the LCD BIST.

Affected systems

  • Inspiron 5481 2-in-1
  • Inspiron 5482 2-in-1
  • Inspiron 5490
  • Inspiron 5491
  • Inspiron 5591
  • Inspiron 7380
  • Inspiron 7580
  • Inspiron 7386 2-in-1
  • Inspiron 7586 2-in-1
  • Inspiron 7786 2-in-1
  • Inspiron 7390 2-in-1
  • Inspiron 7391
  • Inspiron 7590
  • Inspiron 7591
  • Inspiron 7791 2-in-1


No cause information



The laptop is working as designed. Connect the AC adapter to the laptop and then use the D and Power button key combination to start the LCD BIST diagnostics.

Article Properties

Affected Product
Inspiron 7380, Inspiron 7386 2-in-1, Inspiron 7390 2-in-1, Inspiron 7391, Inspiron 5481 2-in-1, Inspiron 5482 2-in-1, Inspiron 5490, Inspiron 7580, Inspiron 7586 2-in-1, Inspiron 7590, Inspiron 7591, Inspiron 7786 2-in-1, Inspiron 7791 2-in-1 , Latitude 5491, Latitude 5591 ...
Last Published Date

10 Jun 2024



Article Type