Just used this tutorial today to fix my left joycon, thanks for the tips! One thing I’d also recommend is reinforcing the part so the SL and SR buttons are more clicky. To do this, I took the old, faulty part and ripped off the ribbon cable, then used a knife to remove the electronic parts from it so it was just a flat board of the exact same shape. I then screwed both in together one on top of the other, so that the part didn’t flex as much when the buttons were pressed. It’s now more clicky than the original board, which is nice! The piece flexes less too so less prone to breaking.

flexible plastic rules with alcohol work too

For first timer, dont think its possible to skip these steps and remove battery. It’s hard to remove the glue

2022-02-27 update: Manage to skip step 35 onward. I can change the battery without removing the logic board for my iPad Air 2 . It’s similar to the steps in iPad Air LTE Battery Replacement. Thanks Raza for the tips.

2022-02-27 update: Manage to skip step 35 onward. I can change the battery without removing the logic board for my iPad Air 2 . It’s similar to the steps in iPad Air LTE Battery Replacement