@oken try a USB keyboard and see if that works. You most likely have a failed keyboard. The keyboard backlight is a different circuit then the keys. Replacement keyboards are available at many places. For instructions on how to remove the keyboard. See if the instructions on the bottom of [https://www.cheaplaptopkeyboard.com/sony-svf14ac1ql-keyboard-p-328_m-11411.html|this site] will help.
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@oken try a USB keyboard and see if that works. You most likely have a failed keyboard. The keyboard backlight is a different circuit then the keys. Replacement keyboards are available at many places. For instructions on how to remove the keyboard. See if the instructions on the bottom of [link|https://www.cheaplaptopkeyboard.com/sony-svf14ac1ql-keyboard-p-328_m-11411.html|this site] will help.
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While you work on your laptop, take lots of pictures. Once you are done with it, take those pictures and create a guide for iFixit. That will help the next person that has a device with the same issues as you do. It's easy and fun to create these guides. https://ifixit.com/Guide/new The iFixit community will appreciate this.
@oken try a USB keyboard and see if that works. You most likely have a failed keyboard. The keyboard backlight is a different circuit then the keys. Replacement keyboards are available at many places. For instructions on how to remove the keyboard. See if the instructions on the bottom of [https://www.cheaplaptopkeyboard.com/sony-svf14ac1ql-keyboard-p-328_m-11411.html|this site] will help.