Keyboard backlight not working after RMA service

edited March 2021 in ZenBook
  1. System: ZenBook Pro Duo
  2. Battery or AC: Either
  3. Model: UX581GV
  4. Frequency of occurrence: Always
  5. Reset OS: Yes
  6. Screenshot or video:


Detailed description:

After sending my laptop in for RMA service (which took a month) because the battery died after six months, the keyboard backlight does not work. I have tried EVERYTHING. I'm on the latest BIOS, I've reset BIOS defaults, reset Windows, tried different version of System Control Interface V2 and ScreenPad drivers. I took the case apart to confirm that the keyboard backlight ribbon cable is connected to the motherboard (it was). All other hotkeys work, and the F7 key works in a test program. There is no on-screen popup when I press (Fn+)F7 to adjust the backlight (I'm pretty sure there used to be). It seems like this has to be a software issue, but I've tried ALL possible drivers, and this definitely worked before the RMA. Can anyone confirm whether I should see an on-screen popup when trying to adjust the keyboard backlight? I do not want to send this in for repair again and be without the laptop for another month.


  • Hello Stephen, seems more like a hardware issue to me, as all other function key is working for you.

    And you have done all the troubleshooting for the software part.

    It need more cross check to see if the cable is really working.

    There should be a pop up on the screen when adjusting the keyboard backlight.

    I'm really sorry that I would suggest you to send the device back to the service center.

    Thank you so much.

  • @Blake_ASUS , thanks for the response. If the keys all work, and there should be a pop-up on screen, then doesn't that suggest it's a software issue? Can you attach a photo of the on-screen pop-up? This would really help me rule out a hardware problem.

  • It should look something like this.

  • Yes. The version with I9 and 32GB RAM, but the software should be the same. I don't see any differentiation on Asus drivers page.

  • LiviuLiviu Level 2
    edited February 2021

    Do a windows refresh (from Windows settings, don't format the current Windows, otherwise, you'll lose some of Asus software) and see if that fixes. And also, install all the drivers from Asus page, even if Windows update installed some. For some reason, there are some files that the ones from Asus has than the one from Windows. This is something that I've observed, nothing official.

  • Thank you. I will try that and report back. I also have the i9 and 32 GB RAM.

  • Hello Stephen,

    If the backlight cable is not working, then it is not sending the signal to show the pop up.

    Maybe the F7 key is broken.

    Thank you.

  • The F7 key is working. I've tested it. It seems like the software would be responding to the F7 key press to show the popup, not to the keyboard backlight signal cable?

  • Hello Stephen,

    You have touched every driver or software that could effect the backlight, you even reset the system.

    And the backlight is not working under BIOS, right?

    Thank you.

  • Yes I've done all of that. And the backlight does not work in the BIOS.

  • Hello Stephen,

    Please kindly send the device to the service center again to check for the hardware.

    Really sorry for the inconvenience caused.

    Thank you very much.

  • Any chance you can arrange to send me a replacement first, and I'll send this one back? I can't afford to be without this laptop for another month. And then I'd have to trust something else won't be messed up by the "repair."

  • Hello Stephen,

    You may apply for online RMA from below link.

    Or you may contact our local team for more detail arrangement

    Thank you.

  • Hi, I have the same problem! yesterday i received the notebook sent to asus for blue screen problems. They just formatted and left windows 10 1909 installed. I immediately had this problem with the backlight, the key works and all the other popups except this one too.

    I will have to send the notebook back for assistance, a means of work paid a lot and I am very angry.

  • I am pretty sure it is a software issue. My best guess is that when I reset Windows before sending it in for RMA is when it stopped working. I took the back off and confirmed that the backlight ribbon cable is well-connected. There is a 4-pin connector labeled "KB BL" just above the battery. You have to take the battery out to check it, but that is easy to do. I have painstakingly installed every single driver from the support downloads page, and tried every version I could find of the "System Control Interface V2" and Intel chipset drivers. My only guess is that there must be some version of some driver that was originally installed from the factory, but it is not on the recovery partition or in the list of drivers on the website. I can't imagine there is any way that connection/cable is being damaged during the repair process -- it certainly doesn't look like it.

    Someone said the backlight was supposed to work with in the BIOS settings. That would imply that a windows driver is not needed and the function is handled by the BIOS. It doesn't work for me in the BIOS. Can anyone post a picture/video of it working from within the BIOS? Anyone willing to try resetting their PC to see if it still works after that? I'm not sending mine in for another month-long RMA, just to get it back in who-knows-what condition, or to get a refurbished model back. I also sent my original box in with the RMA, and they didn't even send it back in the original box. Needless to say, I probably won't buy another ASUS product.

  • What version of windows do you have installed, 20h2?

    they delivered it to me with the 1909. Now it's crazy that a notebook like this is left behind. I have an asus from 10 years ago that I upgraded to windows 10 20h2 and it doesn't give any problems.

    Please let me know if you find a backlight solution. It seems to me that whoever responds from Asus support does not have access to an archive regarding this notebook, and therefore cannot even give you assistance on known problems. They prefer to send everything to assistance and leave you without a computer for a month.

This discussion has been closed.