Something I wish I knew before picking the Lenovo 730-13IKB in a super-sale open box deal. The Yoga 730-13IKB has 2 really common, and pretty unforgiveable, problems. One is display flickering issues and keyboards that have keys that are randomly flaky. I got the display fixed while it was under warranty (after trying re-seating of the display cable through the hinge and only getting a little improvement), but it went out of warranty when I started having keyboard issues. I would often have the A,S,D keys stop working, but it wasn’t always consistent and was sometimes different keys. One solution that helped was to pull the bottom off, clean the contacts, and re-seat the keyboard connection. That, however, only worked for a little while until it started again.
Time to replace the keyboard with a new one – fortunately it was only $29 in 2021. As for how to do it, It’s Binh Repaired & Reviewed gives a great disassembly demonstration. The most annoying part is the removal of the black plastic wrap over the keyboard. I actually tore the backlight layer – but since my replacement kit had a new one I just tossed the old one. Once you’ve done that, it seems to go pretty well.
Now it appears to work perfectly, hopefully it will continue to do so.
Update 2022: I gave up. The first keyboard worked ok for a few months, then started loosing different keys. I replaced it with another one, and after a few months that one too started having failed keys. I would recommend buying a full price OEM one if you must try this. But I ended up buying a new laptop instead of dropping $100 on a replacement keyboard. I just put it towards $500 for buying a nice lenovo laptop that works as I need it.