I have a Dell XPS 9550 running Windows 10. Yesterday all of a sudden the LCD monitor went totally black, and now it won't turn on at all (not even the backlight), but an external HDMI monitor works fine. I've tried all the usual: powering it off and on, running diagnostics, booting into safe mode, booting into the BIOS, etc, and nothing I've tried will make the LCD monitor working again.
* I can run the display test on startup by pressing "D" and it runs fine -- I see red, green, blue etc -- and the monitor itself seems to be working fine. So it's not an issue with the LCD monitor hardware.
* Even when I boot into the BIOS (either via F12 on startup or via rebooting into the UEFI from Windows) it doesn't turn on the backlight or show on the LCD screen. But I can use the BIOS fine via the external HDMI monitor. So it's not a Windows or driver issue, as the BIOS (well before Windows boots) has the same issue.
* I've tried disabling the Intel and the Nvidia graphics cards in turn, but neither operation helped (and see above point where it doesn't seem like a driver issue).
* The touch aspect of the LCD screen still works.
* I've tried updating to the previous version of the BIOS (1.8.0) and it updates to that version but doesn't fix the problem or change anything.
* My laptop is not under warranty so I want to try to fix it myself.
Any ideas of what to try next? Maybe the red/green/blue diagnostic test uses lower-level hardware to drive it than normal, which is why the "D" test works but nothing else?
Solved! Go to Solution.
Here's how I got one laptop back up and running.
For some reason internal display stopped showing anything after initial DELL logo when powering laptop up on 14.6.2019. The laptop was connected with HDMI to external monitor. This original external monitor didn't show up image either. With another HDMI external screen was working.
Steps to fix:
1. Took battery out and hold power button for 60 seconds.
2. Updated everything with Dell Command Update and checked that BIOS is up-to-date (this needs to be done separately as I've noticed that Dell Command Update doesn't always show the latest BIOS).
3. Disabled Dell PremierColor from auto startup. This had some kind of memory leak as 4 GB memory was in use (after 5 mins PC powered on) and it was raising. This shouldn't use almost any resources.
4. Changed resolution with Intel Graphics control. This was actually the thing which brought image to internal screen. So there was some kind of glitch in Intel's graphic configuration. Tho I must say that the Intel graphic drivers were updated with Command Update also.