A515-51G. No keyboard backlight, Fn+F9 not working after reinstalling WIN10

Sim26
Sim26 Member Posts: 6 New User
After the SSD failed, I installed the KINGSTON SA400M8240G drive. I installed Windows 10 from the MICROSOFT repository and downloaded the drivers from Acer technical support. 
The system works fine except for the keyboard backlight. Fn + F9 has no effect. Following various prompts, I tried to update the BIOS. Jet version 1.15. I downloaded the file with version 
2.02 but I get the message: Mount the EFI sytem partition Failed.
Please give me a hint, what should I do to restore the keyboard backlight? Regards.

Answers

  • JackE
    JackE ACE Posts: 44,868 Trailblazer
    Does Device Manager show any red or yellow driver warnings?

    Jack E/NJ

  • Sim26
    Sim26 Member Posts: 6 New User
    No. Everything in Device Manager is OK
  • JackE
    JackE ACE Posts: 44,868 Trailblazer
    OK, if you haven't done so already install this chipset driver.

    Jack E/NJ

  • Sim26
    Sim26 Member Posts: 6 New User
    Hi Jack. 
    No change after installation. 
    I am loosing my hope :-(
  • JackE
    JackE ACE Posts: 44,868 Trailblazer
    >>>After the SSD failed, I installed the KINGSTON SA400M8240G drive.>>>

    Check to make sure the keyboard backlight connector didn't come loose when you changed drives. It is separate from but right next to the keyboard connector.




    Jack E/NJ

  • Sim26
    Sim26 Member Posts: 6 New User
    Connector and tape are in perfect condition. When I changed SSD i did not disconnect those connectors. I just checked it out.
  • JackE
    JackE ACE Posts: 44,868 Trailblazer
    >>>When I changed SSD i did not disconnect those connectors. I just checked it out>>>

    Can you easily reach it and reseat it a few times just to help assure that its contacts are clean? If still nothing, the issue is then likely due to the generic Win10 installation since the OEM version is different and specific to the ACER proprietary mainboard & firmware. You may have to start downloading and trying other mainboard drivers, eg chipset or trying driver tools such as DriverBooster freeware to see if they pick up anything new online.

    Jack E/NJ

  • Sim26
    Sim26 Member Posts: 6 New User
    Hi. I checked contacts. Everything is clear. No broken tapes. 
    Of course, I suspected that the problem may be related to a specific version of windows prepared by ACER. On the other hand, I thought that it was enough to install the correct drivers from ACER.
    I was thinking for a moment to connect the tape from the keyboard to the permanent power supply through some resistor :-)
    I thought the topic was banal, but not.
    Maybe I will try to use the damaged SSD again? Maybe the recovery partition will be read?
  • Try resetting the battery:
    If the problem still occurs, disconnect the lithion battery and the rtc battery. Then connect the rtc battery and the lithion battery again.
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  • JackE
    JackE ACE Posts: 44,868 Trailblazer
    >>>Maybe the recovery partition will be read?>>>

    Yes, but activating it seems to involve a process that often gets confused even when the bad SSD replaced by an identically-cloned SSD. Unfortunately, about the only almost but not quite sure-fire way of doing a true factory reset is following the ACER advice that almost nobody follows --- making a recovery stick when you first acquire the machine.   :/   You still might want to try the updated ACER chipset drivers or trying driver tools such as DriverBooster freeware to see if they pick up anything new online.

    Jack E/NJ

  • Sim26
    Sim26 Member Posts: 6 New User
    edited August 2021

    Thank you but problem remains the same.

    I help a friend who came to me already with a broken ssd and without a system backup on a flash drive.
  • JackE
    JackE ACE Posts: 44,868 Trailblazer
    You still might want to try the updated ACER chipset drivers or trying driver tools such as DriverBooster freeware to see if they pick up anything new online. If is still doesn't work, then you might be able to get the original ACER factory recovery USB by clicking on this link , clicking your country, clicking the support link at the top of the page and contact the regional ACER service center. If you live in US or Canada, the recovery USB might be available from the ACER store.

    Jack E/NJ

  • Easwar
    Easwar Member Posts: 6,727 Guru
    Hi Sim26,

    It looks like hardware issue. Contact acer tech support,

    https://www.acer.com/ac/pl/PL/content/service-contact


    OR book the unit for repair service,

    https://customercare.acer-euro.com/customerselfservice/CaseBooking.aspx?CID=PL&LID=POL&OP=2

  • JackE
    JackE ACE Posts: 44,868 Trailblazer
    You still might want to try the updated ACER chipset drivers or trying driver tools such as DriverBooster freeware to see if they pick up anything new online. If is still doesn't work, then you might be able to get the original ACER factory recovery USB by clicking on this link , clicking your country, clicking the support link at the top of the page and contact the regional ACER service center. If you live in US or Canada, the recovery USB might be available from the ACER store.

    Jack E/NJ