AirPods Pro USB-C Kit - Assembly Guide
If you’re reading this you probably bought a kit from my shop.
You can start by watching the following video to give you a good idea on how to install the kit. Please keep in mind that the video won’t change but the written instructions on this page will always be updated with new tips and tricks.
(last updated on 30.04.23)
The kit is compatible with case model number A2190. You can find it on the underside of the lid.
If your case says “Assembled in Vietnam” on the back, right above the pairing bouton, DO NOT PROCEED. Read this page first.
Figure 1. Model Number Location
A vise, I’m using a Stanley 83-069, but you can use any vise. Just make sure you can open the jaws wide enough to fit the 61mm length of the case. Ideally your vise has soft rubber jaws, mine has nice removable ones. If you don’t have soft jaws, you can use metal jaws and protect your case with masking tape.
A Torx T4 screwdriver, T5 also works.
A pair of fine tweezers.
A small quantity of Isopropyl Alcohol (otherwise known as IPA, 2-propanol or Isopropanol). Make sure you get 99 percent purity or above. Sometimes if you get it from a pharmacy or drug store they can sell you 60 percent purity and it’s really not great for electronics. It’s important to note that rubbing alcohol may sometimes contain other additives, so it might not be 100% isopropyl alcohol. Pure Acetone could also potentially help if you only have this. Do not use WD-40.
A guitar pick. I found that the Ernie Ball Everlast 0.73mm works great. If you placed an order before 25.04.23 you will get a guitar pick with your PCB, otherwise you can order one from my shop. They usually come in packs of 12 if you buy them yourself.
(Optional) A hot air gun, heat gun, or hair dryer.
(Optional) A magnetizer for your screwdriver. It can make your life easier.
Ok, let’s get started. Let me show you what we are trying to achieve. We want to break the glue bonds, especially around the plastic teeth.
Figure 2. Front Teeth Location
Figure 3. Side and Back Teeth Location
Clamp your case sideways, make sure you removed the AirPods buds and that the lid is open. We want to start closing the jaws to apply pressure on the case.
Figure 4. Side Pressure
That pressure will create two small gaps between the middle frame and the outer shell. Once you have a gap big enough to fit the guitar pick, you can insert it (Figure 5, small arrow) and slide the guitar pick on the side as shown (Figure 5, direction of the big arrow). This will break the glue bond.
Figure 5. First Guitar Pick Insertion
Now we rotate the case 90 degrees and clamp it in the vise. Make sure you leave at least a 10mm gap on top of the jaws (Figure 6, double arrow). Insert your guitar pick in the front of the device and slide it on one side as far as it will go (Figure 7 shows where you can stop). While sliding the guitar pick, I found that making a “wave” motion helped, I show this in the video at the top of the page.
Figure 6. Clamping Gap
Leave the Guitar Pick inserted and squeeze a few drops of IPA so that it flows through the gaps you just created and let it sit for 30 seconds. After the 30 seconds, remove the Guitar Pick.
Figure 7. Corner Stop and IPA application
Insert the Guitar Pick near the LED and repeat the same sliding operation for the other corner. Squeeze a few drops of IPA so that it flows through the gaps you just created and let it sit for 30 seconds. After the 30 seconds, leave the Guitar Pick inserted.
Rotate the case 180 degrees and clamp it in the vise.
What we want to do is to keep the Guitar Pick in that gap and continue working our way to the back of the case. As soon as you can, you will want to partially close the lid and push the Guitar Pick behind the lid (shown on Figure 8). Go as far back as you can, then drop some IPA and wait 30 seconds.
Figure 8. First Back Corner and IPA application
Remove the Guitar Pick and insert it in the other corner. Repeat the same procedure to make your way to the back of the case (shown on Figure 9). Drop some IPA and wait 30 seconds. Keep the Guitar Pick inserted.
Figure 9. Second Back Corner and IPA application
Slide the Guitar Pick through the back of the case in order to join the other corner (Figure 10, direction of the arrow). Do not insert the Guitar Pick too deep in the case for this, as the Wireless Charging Coil is located right underneath the hinge. About 2mm deep is good. I found that rotating the Guitar Pick along its center of mass while having a forward movement helped to slide it through the back without going too deep.
Remove the Guitar Pick.
Figure 10. Back Side Sliding
Rotate the case 180 degrees and clamp it in the vise.
We will now lift the top assembly out, meaning that most of the glue bonds should be broken by now. If you see that a side is already lifting up, that’s a very good sign. If not, it’s ok, but the next step needs to be done with gentle force and control over your arm movement. If you try too hard to lift the assembly, it might suddenly lift quickly and you will rip and break the flex connectors.
Figure 11. Wrist Twisting Movement - Left Corner
Open the lid, grab it with your hand, lift it upward while twisting your wrist left and right. We are trying to slowly lift the left corner for about 1mm (Figure 11), then the right corner for about 1mm, then the left corner again for 1mm, etc. Go slowly and there really shouldn’t be any problem.
If you feel like you are applying too much force, start the tutorial over and this time you can go a little deeper with the Guitar Pick in order to further break down the glue bonds.
Slowly lift the top assembly out, revealing the two B2B (board-to-board) connectors and flex cables.
Figure 12. Lightning and Wireless Charging flex cables
(Optional) Heat up the glue around the two B2B connectors. If you can control the temperature, do not go above 120 degrees Celcius for about 45 seconds. This will help for the next step.
Use tweezers or any other prying tool to disconnect the two B2B connectors (Figure 13). Watch out for the small SMD components soldered on the mainboard next to those connectors, you do not want to rip them off.
Figure 13. Lightning (bottom) and Wireless Charging (top) B2B connectors
We now have the bottom shell separated.
We can remove the two Torx T4 screws holding the Lightning connector (Figure 14, single arrows). The connector is weakly held by glue and you can just push it back and forth (Figure 14, motion shown by double arrow) to remove it.
Figure 14. Torx Screws and Wiggle Motion
Unglue the LED from the Outer Shell (Figure 15)
Figure 15. LED Removal
You can now completely remove the Lightning connector from the Outer Shell.
Push the bottom metal slot out with your screwdriver (motion shown on Figure 16).
Figure 16. Metal Slot Removal
Now we install the new USB-C connector.
We start by bending it correctly so that we don’t have issues later. The LED should bend down (Figure 17, small arrow) and the B2B connector bend up (Figure 17, big arrow).
Figure 17. Global Bending
We also need to bend the flex cable near the B2B connector. There are two white lines on the PCB acting as guides (an example is shown on Figure 18, big arrow). You need to bend the flex PCB where those white lines are. The white line is always “inside” the bend. Do not bend the PCB completely flat, add a small radius to your bend. It might tear if you don’t add a small radius to your bend. The final bend should look like an “S”, and the connector should be facing out (Figure 18, small arrow).
Figure 18. B2B Bending
Place the Metal Spacer (provided with the PCB) in the slot at the bottom of the case (Figure 19). Optionally, you can use some of the red double-sided tape that came with the PCB to secure the spacer. Do not use more than 2/3 of the tape, you will need some later.
Figure 19. Metal Spacer Placement
Place the USB-C connector inside the Outer Shell while making sure the B2B connector is facing where the hinge slot is located and the LED is facing the other side (where the LED hole is). This is why we bent the connector on Figure 17.
Add the two Torx T4 screws and screw them in about halfway. This is where the optional Magnetizer comes in handy. It makes it much easier to place those screws. Now, connect a USB-C cable at the bottom of the shell and then tighten the screws all the way. This is to make sure that everything is lined up properly. Disconnect the USB-C cable.
Make sure the flexible PCB is straight, that the area where most components are placed is not bent (Figure 19, should be parallel to the red line).
Figure 20. Example of straight PCB
Place the LED inside its slot on the inside of the Outer Shell. You basically need to do the opposite of what Figure 15 showed you. You can use the rest of the red double-sided tape to secure it in place.
Partially slide back in the top assembly and connect the two B2B connectors. Plug in a USB-C cable and make sure it is charging and everything works well. Do not go further if you don’t see your AirPods charging at this point. If it doesn’t charge, you most likely didn’t plug in the B2B connector to the mainboard properly.
If everything works well, you can optionally add some hot glue to the two B2B connectors (shown on Figure 13) to make sure they don’t get disconnected in the future.
Make sure the USB-C B2B connector bends properly (the “S” shape shown on Figure 18) and close the whole thing. The Wireless Charging B2B connector should bend similarly. If you can’t close it all the way down, it’s because the connector is not bending like the “S” shape, or because the PCB is not sitting straight (Figure 20) and is pushing against the battery.
You did it!! Congrats :) Because you bought from my shop, you will soon have partial access to my Discord server where you can post a picture of your final result! You can also tweet it at me if you’d like. I would really appreciate it and will definitely congratulate you again.