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# 208564 16-Feb-2017 21:59
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The screen on My wife's HP 4540S has stopped working.


The laptop starts and runs OK, it will drive an external screen.


The laptop screen is not entirely dead as it changes from a dark screen (but one that shows the glow you see when the screen is blank when a computer is on) to completely black and back again like happens during the boot up process. There is never any graphics displayed.


I tried the trouble shooting suggested on the HP website but no luck.


Is it likely to the the screen, the cable or the GPU. I figure that since an external screen works OK, the GPU is probably OK.


Any help appreciated.



Sony Xperia X running Sailfish OS. The true independent open source mobile OS 
Samsung Galaxy Tab S3
Nokia N1
Dell Inspiron 14z i5

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3128 posts

Uber Geek
+1 received by user: 661


  # 1722306 18-Feb-2017 16:23
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Well, I disassembled the laptop enough to remove the screen. On this model that means pretty well pulling the whole thing apart. It wasn't that difficult with the aid of the service manual.


I also disassembled the screen assembly to the point I had just the screen on its own. I couldn't see anything obvious. I prodded and pushed on the cable plug at the rear of the screen and the area around this point.


I decided to put the laptop back together to the point I could run it. I left the screen bezel off along with anything else not absolutely needed. I wanted to see if the webcam etc was working.


Much to my surprise the screen worked. I shut it down and finished the reassembly process. It worked again when it was powered up afterwards.


I really don't know what I did to get it going. At this stage I'm assuming a poor connection on a plug.


I gave a One X One warranty on it and handed it back to my wife. This is my lowest warranty, (1 minute and 1 metre), as I don't know what fixed the problem. cool


It's now well out of warranty and still running. smile


Thanks for the suggestions.

Sony Xperia X running Sailfish OS. The true independent open source mobile OS 
Samsung Galaxy Tab S3
Nokia N1
Dell Inspiron 14z i5

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