Make your own Touch ID Button

TouchID-Keyboard-Components.md

Tools Needed

• iFixit iOpener Set
• T4 Screwdriver
• T3 Screwdriver

Steps

1. Soften adhesive using iOpener

2. After about 60~90 seconds, use Opening Picks (or a slot screwdriver that's thin enough to fit) to pry open the back cover from upper right corner

3. Apply more forces to completely remove the back cover

4. Disconnect the battery

5. Remove the screws (T4) that keeping the black plate attached to the frame and remove the black plate

6. Disconnect all 3 connectors from the logic board and take out the logic board from the Keyboard frame

7. Remove the Lightning connector (T3)

8. Remove the power switch from upper left corner (T3)

9. Carefully remove the sticker(?) from the connector and disconnect Touch ID sensor from the connector

10. Unscrew the mounting screws around the Touch ID sensor (T3), and remove the Touch ID sensor

11. Carefully remove the flex cable used to connect Touch ID sensor

Now you have all the parts to put together a standalone Touch ID device for your Apple silicon Mac.

After connecting the Lightning connector and Touch ID sensor back to the logic board, you can pair the Touch ID sensor with your Mac under System Preferences.

If the pairing step doesn't appear when you go to Touch ID settings -> add a new fingerprint, make sure the Touch ID sensor is correctly connected and try power cycle the Touch ID device.

I've had no issues with the lightning connector on two of these, but I cannot get either of them to work wireless via Bluetooth.

For someone who has successfully accomplished wireless, I have a few questions:

1. you do not need the power switch and connector (and prior position does not matter),

2. you do not need anything from the keyboard ribbon cable (and did not short any of those lines for power), and

3. you did not need to connect a new antenna (just using the board itself)?

The behavior I am seeing is that if I connect via lightning then the battery will charge, but when I disconnect the cable it does not show up in Bluetooth and the battery depletes very quickly. But given I am seeing this on both, I do not expect a simple cable connection error.

Answering my own questions for the benefit of the community:

1. I did not need the power switch -- it's "always on" for me even without the switch parts connected.
2. No, I did not need anything from the keyboard ribbon cable.
3. The antenna appears to be the top right of the keyboard near the rubber strip. When you remove the board, it ends up just being a little metal stub - but that still has surprisingly good range without adding an external antenna wire.

In terms of my actual connectivity and battery issue...

The glue was a huge pain, so I used WD-40 Specialist Contact Cleaner Spray to loosen the glue instead of heat/pressure. FWIW, this worked great - I didn't heat the board nor had to do much prying like the YT videos. While that spay appears safe for the electronics, I believe it damaged the batteries in both. I replaced one battery today and the wireless TouchID is now working great!

Incidentally, you can use wireless Bluetooth (without any battery) by just using a USB power cable if you don't want to give up a USB port on the Mac. That seems obvious in hindsight, but I hadn't considered it originally since you need to actually connect to pair first.

The little round shiny thing on the traces from the built-in antenna is a micro-coaxial connector that could probably be used to connect an external bluetooth antenna.

Brilliant! I hadn't noticed that little detail.

As the ungluing problem seems to be significant, I can share something that worked like a charm.

Putting the keyboard on the heated 3D printer bed.

Large heating area, fully customizable temperature.

What temp did you end up going with? (Hard to tell, looks like 65C?)

What temp did you end up going with? (Hard to tell, looks like 65C?)

70 C

FWIW the glue wasn't too bad for me, I used a cheap heatgun from Amazon, blasted it around the edges and worked my way around the perimeter with some guitar picks.

• the battery has a pull-tab adhesive, so you don't need to pry it out (like I did)

This was gold. Thanks!

I managed to tear the ribbon cable between the mainboard and the touchID sensor. Anyone found a replacement?

I just did the same... still searching

Anyone have luck finding one or a workaround?

After connecting the device to a Mac, it is successfully identified as a keyboard. While physical button presses (clicks) register perfectly, fingertip contact (touch) does not trigger any input. Any ideas?

After connecting the device to a Mac, it is successfully identified as a keyboard. While physical button presses (clicks) register perfectly, fingertip contact (touch) does not trigger any input. Any ideas?

If you disconnected anything, make sure you reconnected it the right way (that is, check the connector isn't flipped if it is the sort of ribbon connector one can flip around). Also inspect the ribbon cables for any damage.

btw to try and save more people from accidentally destroying their batteries by prying them out, this pic shows the adhesive pull tab for the battery circled in red. peel this off and pull it out from under the battery and the battery will pop right off:

Can anyone explain how in the world did you suggest to

"11. Carefully remove the flex cable used to connect Touch ID sensor"

and leave the peeled touch ID cable exposed like that and expect to reconnect it properly to the board?

Or did I miss something here?

Either that or they introduced a different way to attach the extension wire on different revisions to cut costs, because mine didn't have a connector on the touch ID side :'(

Mine had a cable-to-cable connector some distance from the Touch ID sensor, but despite the instructions to unwrap the protective tape and disconnect it, I left it attached at that point and was able thread the whole cable including the connector assembly out of the keyboard frame. I think that saved me some hassle and also additional opportunities to break delicate things.

Exactly as pointed out by my own experience and someone at printables too:

Can you share a picture of what yours look like? I wonder if they did some hardware revision recently.

I discarded it already :( But even in the youtube video, the guy shows the touchid assembly like yours and in the next frame the rest of the ribbon cable has magically reappeared! Like if he noticed he messed it up like I did :(

I'm just way too surprised no one else "complained" about this before and so many successful builds no one warned the community besides MBCook and myself....

Can anyone explain how in the world did you suggest to

"11. Carefully remove the flex cable used to connect Touch ID sensor"

and leave the peeled touch ID cable exposed like that and expect to reconnect it properly to the board?

Or did I miss something here?

I believe step 11 refers to removing the remaining length of ribbon cable (the part labeled 821-03058-A in step 9) from the keyboard chassis. That is, carefully peeling up the thin ribbon cable that goes from the touch ID sensor connector to the main circuit board.

In my case, I did not disconnect the circled tape-covered connector, so the touchID board and the whole length of the cable was still attached. Then I fed the whole length (which was already unplugged in step 6) out of the chassis together.

So I don't know if mine could be unplugged or not; I never tried.

Yes, that IS the way, but the pic tells otherwise, and shows the "shortened" version of the touchID.

Also important to note somewhere that if you "fck" up the wire, you'll have to use a donor touchID from the EXACT same FAMILY keyboard it belonged to or it wont work!