ggonda
1 Copper

Dell Vostro 14 [black screen, external display works fine]

I have dell vostro 14 3000 series, Recently laptop screen is gone black. I can see the external display working fine. I did run BIST, It completed successfully and able to see the colors on the builtin display during the test.

I also ran pre-boot diagnostics(Fn+power) without any issue. Please help me to diagnose the issue.

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3 Replies
9 Rhodium

RE: Dell Vostro 14 [black screen, external display works fine]

Check the cable that runs between the mainboard and back of the display panel.  If it's damaged, replace it.  That doesn't solve the problem, the next suspect is the mainboard.

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ggonda
1 Copper

RE: Dell Vostro 14 [black screen, external display works fine]

Thank you for the quick reply.

cable looks fine, and today I closed the lid and opened it back, it started blinking. Right now, I can see the display on the screen, but continuously blinks. black screen issue started after keeping the laptop idle for a week, and it started blinking after using it for a day.  

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Highlighted
9 Rhodium

RE: Dell Vostro 14 [black screen, external display works fine]

Replace the video cable with a new one.  

Since the display works in BIST (and assuming it doesn't flicker there), if the video cable fails to solve the issue, replace the mainboard.

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