I experienced the same problem:

I suspected the keyboard or TouchID sensor wouldn’t work, so I went on and checked every connector.

I missed connecting the left TouchID sensor from step 31.

I had a similar problem.

I suspected the keyboard or TouchID sensor wouldn’t work, so I went on and checked every connector.

I missed connecting the left TouchID sensor from step 31.

I suspected the keyboard or TouchID sensor wouldn’t work, so I went on and checked every connector.

I missed connecting the left TouchID sensor from step 31.

I suspected the keyboard or TouchID sensor wouldn’t work, so I went on and checked every connector.

I missed connecting the left TouchID sensor from step 31.

On the reassembly this was a crucial part I have forgotten.

Without this, and NVRAM autoboot disabled my MBP wouldn’t start up and only show me the battery state.

Same story like https://de.ifixit.com/User/4379923/M473J

It mocks me with a green battery icon (which is increasingly loading).

No reset of NVRAM or PRAM seem to have an effect.

After sending this command in terminal when I checked what happens if I now open the lid, instead the screen lit slightly up (still black) then a battery symbol showing the charging state showed up.

Now, after replacement of the battery, this is all I get to see.

No reset of NVRAM nor PRAM helped.

Currently the new battery charges (58% atm) and it feels like it‘s mocking me.