Some keyboard keys are randomly not working

vtv
vtv Member Posts: 12

Tinkerer

Problem appears on Acer VN7-791G-74XP laptop with Windows 10, which is not really used much at all.
Did suffer from a mild tea spill about a month ago, turned off instantly, was taken apart, had a single minor leak below keyboard, was dried for a couple of days.
There were no issues with keyboard for about a month since that spill.

Occasionally one of 2 defects appears, can appear and disappear within a single session:
1. Some keys stop reacting at all (S,D, Caps Lock, G, H, both Shifts, "-" on number pad while "-" just above P is working)
2. Same keys may not work from the first press, repeated presses may or may not help, sometimes pressing other keys helps

Other interesting findings:
  • When keys are not working, keyboard backlit is not enabled on key press (when on battery)
  • When keys are not working, they are not working also in BIOS
  • Bluetooth keyboard works fine, so it's unlikely that it's some kind of hotkey setting malfunction

What was checked and doesn't seem to be helping:
  • Driver uninstall / restart
  • Disabled Filter Keys / Sticky Keys / Toggle Keys
  • Checked Acer Support for updated drivers (were none from 2018 or 2019)
  • Similar issues in community (none really matching this case)
Few directions of further investigation:
  • Rollback of most recent Windows 10 R1903 update did not solve the issue completely, but made it less acute (typed all the above on without issues)
  • Haven't tried running alternative operating systems, might exclude Windows issues if there are any
  • Resetting Windows 10
  • Replacing keyboard module
If you have any advice, please share. If you have the same issue - please let know.

Answers

  • Kingsmanvk
    Kingsmanvk Member Posts: 19 Troubleshooter
    edited August 2019
    vtv said:
    Problem appears on Acer VN7-791G-74XP laptop with Windows 10, which is not really used much at all.
    Did suffer from a mild tea spill about a month ago, turned off instantly, was taken apart, had a single minor leak below keyboard, was dried for a couple of days.
    There were no issues with keyboard for about a month since that spill.

    Occasionally one of 2 defects appears, can appear and disappear within a single session:
    1. Some keys stop reacting at all (S,D, Caps Lock, G, H, both Shifts, "-" on number pad while "-" just above P is working)
    2. Same keys may not work from the first press, repeated presses may or may not help, sometimes pressing other keys helps

    Other interesting findings:
    • When keys are not working, keyboard backlit is not enabled on key press (when on battery)
    • When keys are not working, they are not working also in BIOS
    • Bluetooth keyboard works fine, so it's unlikely that it's some kind of hotkey setting malfunction

    What was checked and doesn't seem to be helping:
    • Driver uninstall / restart
    • Disabled Filter Keys / Sticky Keys / Toggle Keys
    • Checked Acer Support for updated drivers (were none from 2018 or 2019)
    • Similar issues in community (none really matching this case)
    Few directions of further investigation:
    • Rollback of most recent Windows 10 R1903 update did not solve the issue completely, but made it less acute (typed all the above on without issues)
    • Haven't tried running alternative operating systems, might exclude Windows issues if there are any
    • Resetting Windows 10
    • Replacing keyboard module
    If you have any advice, please share. If you have the same issue - please let know.

    Was the problem solved or is it that replacement is the only solution...
    I am facing the same issue on my Helios 300 G3-572...
  • This content has been removed.
  • This content has been removed.
  • andylb
    andylb ACE Posts: 3,827 Pathfinder
    edited September 2019
    vtv said:
    Problem appears on Acer VN7-791G-74XP laptop with Windows 10, which is not really used much at all.
    Did suffer from a mild tea spill about a month ago, turned off instantly, was taken apart, had a single minor leak below keyboard, was dried for a couple of days.
    There were no issues with keyboard for about a month since that spill.

    Occasionally one of 2 defects appears, can appear and disappear within a single session:
    1. Some keys stop reacting at all (S,D, Caps Lock, G, H, both Shifts, "-" on number pad while "-" just above P is working)
    2. Same keys may not work from the first press, repeated presses may or may not help, sometimes pressing other keys helps

    Other interesting findings:
    • When keys are not working, keyboard backlit is not enabled on key press (when on battery)
    • When keys are not working, they are not working also in BIOS
    • Bluetooth keyboard works fine, so it's unlikely that it's some kind of hotkey setting malfunction

    What was checked and doesn't seem to be helping:
    • Driver uninstall / restart
    • Disabled Filter Keys / Sticky Keys / Toggle Keys
    • Checked Acer Support for updated drivers (were none from 2018 or 2019)
    • Similar issues in community (none really matching this case)
    Few directions of further investigation:
    • Rollback of most recent Windows 10 R1903 update did not solve the issue completely, but made it less acute (typed all the above on without issues)
    • Haven't tried running alternative operating systems, might exclude Windows issues if there are any
    • Resetting Windows 10
    • Replacing keyboard module
    If you have any advice, please share. If you have the same issue - please let know.

    Was the problem solved or is it that replacement is the only solution...
    I am facing the same issue on my Helios 300 G3-572...

    @Kingsmanvk please start a separate topic for your problem , thankyou

    Please click YES if I answered your question

    I am not an ACER employee
    Thank you and have a blessed day  B)

    ★★ ACE Pathfinder 2019★★

  • This content has been removed.
  • andylb
    andylb ACE Posts: 3,827 Pathfinder
    Sir I'm sorry if my signature offends you. I am more than capable of helping and I know many troubleshooting tips for this problem which I was more than willing to share if you started your own Topic. The tradition on this Forum is to start ones own topic because sometimes what looks to be the same problem may be caused by a different thing and so the answers become entangled and may not be relevant to the initial or the subsequent post. You are a new poster here and I was merely trying to help you get the most answers. Please remember that none of us here work for Acer and we give of our own free time to help share what knowledge we have. Good luck and I truly wish you a blessed day.

    Please click YES if I answered your question

    I am not an ACER employee
    Thank you and have a blessed day  B)

    ★★ ACE Pathfinder 2019★★

  • Unknown
    edited September 2019
    This content has been removed.
  • Pit_
    Pit_ Member Posts: 1 New User
    Same problem here, with diferent keys (a, c, x) Ctrl-C
  • This content has been removed.