Geekzone: technology news, blogs, forums
Guest
Welcome Guest.
You haven't logged in yet. If you don't have an account you can register now.




3117 posts

Uber Geek
+1 received by user: 656

Trusted

# 208564 16-Feb-2017 21:59
Send private message

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.

 

Thanks





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


Filter this topic showing only the reply marked as answer Create new topic
2540 posts

Uber Geek
+1 received by user: 758

Trusted
Lifetime subscriber

  # 1721578 16-Feb-2017 22:07
Send private message

Hmmmm....  this model has an LED backlight, if I recall correctly.  It would be unusual for this to fail, but it is a possibility.  If you look carefully at the screen, possibly shining a torch light on the right angle, can you make out whether a picture is actually showing on the laptop's screen, just incredibly darkly?  The individual pixels on the display itself do not give off any light, and require a separate light source which in this case is a strip of LEDs on the very edge of the glass display, hidden behind the plastic edge of the screen.





"4 wheels move the body.  2 wheels move the soul."

“Don't believe anything you read on the net. Except this. Well, including this, I suppose.” Douglas Adams



3117 posts

Uber Geek
+1 received by user: 656

Trusted

  # 1721582 16-Feb-2017 22:14
Send private message

It appears the backlight is working. If you leave the laptop alone the screen appears to be timing out. The screen goes completely dark then lightens up around the edges when the touchpad is touched.  You can actually see light at the bezel edges.





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


 
 
 
 


2540 posts

Uber Geek
+1 received by user: 758

Trusted
Lifetime subscriber

  # 1721609 16-Feb-2017 22:33
Send private message

Hmmm...  that suggests to me the display panel or its cabling is likely to be the faulty party.

 

Perhaps back up your data and send the machine to someone like these guys to fit a new panel.  Ask them to test the new panel works before putting the laptop back together again, and if the new panel does not work, presumably the fault is more advanced and likely not worth repairing.  They might charge you $50-$60 to do this if they don't end up selling you a panel.

 

http://www.trademe.co.nz/computers/laptops/other/auction-1259757211.htm 

 

If you consider yourself pretty handy, and you can afford to 'lose' the laptop if you make a mistake and kill it completely somehow, perhaps just order a panel and have a crack at replacing it yourself.

 

https://youtu.be/H_QYVTNbZv0 

 

Note that while I have replaced my own mobile phone and laptop screens myself, I do not do this commonly so others may have a different opinion.





"4 wheels move the body.  2 wheels move the soul."

“Don't believe anything you read on the net. Except this. Well, including this, I suppose.” Douglas Adams



3117 posts

Uber Geek
+1 received by user: 656

Trusted

  # 1721952 17-Feb-2017 18:02
Send private message

I see no problems changing the screen. It doesn't look any more difficult than what I've done in the past.  I'd just want to be pretty sure it was the screen before shelling out for a replacement one.

 

I might disassemble the laptop and check the connector ribbon and the connectors and go from there.





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


1830 posts

Uber Geek
+1 received by user: 530


  # 1721999 17-Feb-2017 20:32
Send private message

Tried the keyboard combo to switch screens? Windows key + P if in windows or fn key plus respectively labelled F-key



3117 posts

Uber Geek
+1 received by user: 656

Trusted

  # 1722004 17-Feb-2017 20:51
Send private message

MadEngineer: Tried the keyboard combo to switch screens? Windows key + P if in windows or fn key plus respectively labelled F-key

 

Yep, had tried that, but tried it again just now.  The laptop screen doesn't work in either duplicate or extended  modes. The external screen works OK.





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




3117 posts

Uber Geek
+1 received by user: 656

Trusted

  # 1722306 18-Feb-2017 16:23
Send private message

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. https://sailfishos.org The true independent open source mobile OS 
Samsung Galaxy Tab S3
Nokia N1
Dell Inspiron 14z i5


 
 
 
 


1830 posts

Uber Geek
+1 received by user: 530


  # 1722777 19-Feb-2017 19:25
Send private message

Nice.  Also, with HP, never assume that the warranty or even HP phone support ends at 12 months.


2540 posts

Uber Geek
+1 received by user: 758

Trusted
Lifetime subscriber

  # 1722925 20-Feb-2017 10:18
Send private message

Fantastic result.  Well done.

 

I would like to resell some of your warranties to family members....





"4 wheels move the body.  2 wheels move the soul."

“Don't believe anything you read on the net. Except this. Well, including this, I suppose.” Douglas Adams

Filter this topic showing only the reply marked as answer Create new topic



Twitter and LinkedIn »



Follow us to receive Twitter updates when new discussions are posted in our forums:



Follow us to receive Twitter updates when news items and blogs are posted in our frontpage:



Follow us to receive Twitter updates when tech item prices are listed in our price comparison site:





News »

Anyone can broadcast with Kordia Pop Up TV
Posted 13-Jun-2019 10:51


Volvo and Uber present production vehicle ready for self-driving
Posted 13-Jun-2019 10:47


100,000 customers connected to fibre broadband network through Enable
Posted 13-Jun-2019 10:35


5G uptake even faster than expected
Posted 12-Jun-2019 10:01


Xbox showcases 60 anticipated games
Posted 10-Jun-2019 20:24


Trend Micro Turns Public Hotspots into Secure Networks with WiFi Protection for Mobile Devices
Posted 5-Jun-2019 13:24


Bold UK spinoff for beauty software company Flossie
Posted 2-Jun-2019 14:10


Amazon Introduces Echo Show 5
Posted 1-Jun-2019 15:32


Epson launches new 4K Pro-UHD projector technology
Posted 1-Jun-2019 15:26


Lenovo and Qualcomm unveil first 5G PC called Project Limitless
Posted 28-May-2019 20:23


Intel introduces new 10th Gen Intel Core Processors and Project Athena
Posted 28-May-2019 19:28


Orcon first to trial residential 10Gbps broadband
Posted 28-May-2019 11:20


Video game market in New Zealand passes half billion dollar mark
Posted 24-May-2019 16:15


WLG-X festival to celebrate creativity and innovation
Posted 22-May-2019 17:53


HPE to acquire supercomputing leader Cray
Posted 20-May-2019 11:07



Geekzone Live »

Try automatic live updates from Geekzone directly in your browser, without refreshing the page, with Geekzone Live now.


Support Geekzone »

Our community of supporters help make Geekzone possible. Click the button below to join them.

Support Geezone on PressPatron



Are you subscribed to our RSS feed? You can download the latest headlines and summaries from our stories directly to your computer or smartphone by using a feed reader.

Alternatively, you can receive a daily email with Geekzone updates.