Hi!
I bought a pair of broken joycons, and the right one is especially heavily damaged - it’s not connecting wirelessly (although it has power, since the LEDs are showing the sync sequence), the top case is broken, analog’s button is not working, the R button is broken in half, its microswitch is ripped out of the board together with all three pads, the rumble motor has the metal casing slightly bent in one place, and there is one component missing on the board. It was present inside when I opened it the first time, but I guess I flicked it with the tweezers and sent to its happy place - can’t find it anywhere now.
So I’m looking around the web what it might be, but can’t find any schematics of that area. Does anyone have an idea?
Yeah - seems plausible from how this seems to be a section providing 1.8v for the wireless chip so it can be compared with similar sections on the Switch PCB, which seems to be a lot more often discussed about.
There is also what seems to be the 24MHz oscillator delidded north to the broadcom chip - is this a common issue when dealing with connection issues? Can it be bad? I ordered some spares.
Also, two semi-broken R joycons are coming for me to play with and have something to compare against.
Follow-up.
The oscillators have been delivered and I apparently ordered the wrong ones. T240 are too big. Goshdarnit.
What I actually meant was that ones in the 3225 package are too big. Apparently 2016 (or 2016-4P) ones are more likely. And they’re not oscillators, just crystals. 
And apparently I’ve done some bad research, because there are already answers in this very forum on that topic.
Final update.
I fixed the ZR traces, mounted a new button there, replaced the destroyed oscillator with a new one (T240 2016 from Aliexpress), soldered a new capacitor and the joycon works!
Finished the rebuild with a new hall effect analog, and a cool new transparent housing. The ZR spring was mangled a bit so I’ll order a new set of replacement screws and springs and will wrap this one up.
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