EliteBook 840 G3: Black Glowing LED Screen after Upgrade to QHD

[Wintr]

Hello,

I recently saw fit to upgrade my HP EliteBook 840 G3 from 1366x768 to 2560x1440. The original vendor told me the device was 1080p but it was not. To upgrade I bought a QHD LED screen and a new eDP cable with 40pins because the 30pins eDP cable only works with resolutions upto 1080p.

Now the computer boots but the screen glows black. I can get the computer to boot normally if I connect to an external screen via the the display port but only if I remove the eDP cable from the motherboard first. I presume from the sounds that the computer is booting correctly while the display is black.

How can I tell if the problem is with the screen or the eDP LED cable? I've noticed that the with my replacement 40pin eDP cable, there is no clicking noise when I connect to the motherboard but there is when I use the 30pin eDP cable. Other users have successfully upgraded from 1366x768 to 2560x1440.

Related question: EliteBook-840-G3-Replace-1366x768-panel-by-QHD-panel . To answer a user's question from the last thread, the 40pin eDP cable's product code for me was 6017B0584902.

[Wintr · Accepted solution]

It was indeed a faulty eDP cable. I had to wait a while but the upgrade worked. This thread should be marked as solved.

[VictorS]

Hi,

We're glad you managed to solve your problem 😉

Thank you for sharing how you solved it. This way, you will be helping other users that have the same question.

Thanks,
VictorS