Macbook 12 A1534 2015 Keyboard Stopped Working

[chaeze]

Hello,

My Macbook keyboard (except the Power button and the trackpad) suddenly stopped working yesterday and I'm unsure which part is defective. No spills or anything of that sort. It was just on, worked on it and left it for an hour so before realizing the keyboard stopped working after I resumed work.

Right now, I've connected an external keyboard so that works. I've resetted the SMC and PRAM/NVRAM to no avail.

After a couple of days struggling to adapt to an external keyboard and the whole setup with the USB hub .... the keyboard miraculously started working again.
After the Macbook went back to sleep again, it just stopped working again.
Again, only the trackpad, power and I think command, options buttons are working. So odd.

Update:

I've replaced the keyboard + trackpad ribbons and as a last resort also ordered AND replaced the upper case incl. keyboard.
The keyboard still doesn't work and this time with the new keyboard installed, NONE of the keys except the power button and the trackpad work.
I don't have a clue what to look for anymore.

 

[chaeze]

i've finally solved the issue!
I ordered 2 in total, one off of eBay and one from Amazon. I saw a lot of reviews on Amazon for these cables in general that they're faulty ..etc
I opened the notebook once more to see if I indeed didn't miss anything, so I unplugged the ribbon cable (let's call it #1) and trying turning the macbook on.
Didn't work so I replugged it and only the power button worked.
So I looked at my other two spare ribbon cables, which I tried before and didn't work at that time, and one of them bothered me because of the length.
I had to bend it a little to fit in the connector. I tried that one, bend it a little and just before putting on all the screws again i turned it on an tested the keyboard.
Worked great. Well, I was relieved. So relieved. Spending $100+, got an A+ grade keyboard (this one has quite a few sticky keys!) and all for a faulty ribbon cable that really cost me $13.00
Gddmn.

TLDR: faulty ribbon cable, one of new ones I ordered was defective. Luckily I ordered two and one of them just so happened to work.