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My Dell Latitude E6420 has black screen of death. Let me explain what happen. My friend bought a battery for his E6440 laptop and his laptop not starting (no display) he asked me to check on my laptop for that battery.

My laptop display gone after inserting his battery and changed to my battery still didn't worked. I connected external monitor display coming there (external monitor is showing primary). but laptop display not coming to make it secondary.

I did steps.

  1. drained power 30-1-2. still didn't work

  2. changed RAM slots with another still didn't work

  3. tried D+ power, did not see anything.

this morning I observed If close display 70 to 80% I can see barely light on the screen window login in the angle.

Is that means back light gone? What are solutions have now? Do I need to change display? give me suggestion.

  • Likely to be a bad connection on the ribbon cable connecting the screen to the motherboard inside the laptop. Could also be that the backlight controller has failed. – mt025 Sep 12 '16 at 19:18
  • What you mean backlight controller. I have seen keyboard backlit working fine. Is something different. If change screen will it work? I can see 2 screen display (in gray) in display properties. – James123 Sep 12 '16 at 19:23
  • It's hard to imagine how temporarily plugging in a different battery could affect your screen, other than by coincidence. It does sound like the issue is somewhere in the laptop lid (problem with the backlight or loose ribbon cable connection seem like a good first place to look), but this will be hard for people here to definitively diagnose. – fixer1234 Oct 2 '16 at 5:29

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