Hardware Left Joy con completely dead

pretovic · Jan 9, 2021

My left joy con is dead. Completely no sign of life.
The controller has a second version of the motherboard.
I tested the battery, rail and sync/sl/sr board. All work in other controllers. Probably it is also not the fault of the power connector. Multimeter shows the correct voltage at VBattery point. Has anyone already had such a case and knows what the cause is?

The Real Jdbye · Jan 9, 2021

A blown fuse? Are there any fuses in the JoyCons?
If not, it's likely one blown component that is causing something to short out. You can trace from where the power comes in, and measure every point after where the power comes in to see if it's shorted to ground anywhere (continuity test with multimeter, though the buzzer may not go off if the short to ground is indirect and still has some resistance to it, so also look at the numbers)
Might be tricky to tracw where the power goes without schematics. Not sure how many layers the JoyCon PCB has, but generally tracing on modern PCBs is much harder since the traces are often hidden.

lpoolm · Jan 9, 2021

Following, also have the exact same issue, I believe there is a fuse on there by battery connector but very very small!, not opened mine back up to check!

The Real Jdbye · Jan 9, 2021

lpoolm said:
Following, also have the exact same issue, I believe there is a fuse on there by battery connector but very very small!, not opened mine back up to check!

You can measure it for continuity easily.

pretovic · Jan 9, 2021

lpoolm said:
Following, also have the exact same issue, I believe there is a fuse on there by battery connector but very very small!, not opened mine back up to check!

You mean this one ( sorry forquality of photo).
In my case this fuse is good, has continuity.

lpoolm · Jan 9, 2021

pretovic said:
You mean this one ( sorry forquality of photo).
In my case this fuse is good, has continuity.

thanks, i will test mine at some point

pretovic · Jan 9, 2021

does anyone have access to schematic diagrams for switch and joy cons ?

CHTechRepair · Jan 13, 2021

pretovic said:
does anyone have access to schematic diagrams for switch and joy cons ?

No schematics are available here. If you have battery voltage and the fuse is good but have no response I would likely blame the main IC. I would double check everything for damage and missing components. You could check for shorts, although the battery would have drained if it had one so it wouldn't be 3.7v+.

Jayro · Jan 13, 2021

Any time I disconnect my left joycon, it gives me a low battery warning, and I don't understand it either. Similar issue here? If you get a solution that works, let me know. They're less than a year old, and I rarely use them unless I'm homebrewing.

CHTechRepair · Jan 13, 2021

Jayro said:
Any time I disconnect my left joycon, it gives me a low battery warning, and I don't understand it either. Similar issue here? If you get a solution that works, let me know. They're less than a year old, and I rarely use them unless I'm homebrewing.

If you've tried a battery and still have this issue the controller likely isn't able to charge the battery. At this point if you want to get really into it you could compare it to a known good same board with diode measurements and likely find your issue. There are only a few electronics to really fail here. A few transistors that handle the charging. The cost of joycons makes that not so worth it, but it could be fun to troubleshoot!

victorstk · Apr 21, 2021

my right joycon is also dead

no power with the battery or when docked

i also checked my fuse and its fine

Velocities · Feb 18, 2023

victorstk said:
my right joycon is also dead

no power with the battery or when docked

i also checked my fuse and its fine

I have exactly the same right joycon, battery is ok and was tested on another the left joycon.
Not charging, no leds, not detected in my switch at all
The fuse shows continuity, and I have some values (voltages on test points) around the battery's connector.
Maybe the fuse is not doing his job properly, I am looking for answers before shorting it. I am not using that joycon anyway.
So maybe the main controller needs some hot air or whatever to rebuild the circuitry. I really dunno I am not an expert.

chrisrlink · Feb 18, 2023

seems to affect 3rd party/chinese knock off ones also mine are too (3rd party) my oems still work but i must replace the left jc rail on my v1 as well (rail bent) the 3rd party (L) wont even externally charge right one works though

Velocities · Feb 18, 2023

chrisrlink said:
seems to affect 3rd party/chinese knock off ones also mine are too (3rd party) my oems still work but i must replace the left jc rail on my v1 as well (rail bent) the 3rd party (L) wont even externally charge right one works though

Mine is official btw

Jayro · Feb 18, 2023

My right joycons is constantly dead, despite being attached to the console all the time. It's kinda pissing me off to the point I wanna sue Nintendo over it, NGL.

Hardware Left Joy con completely dead

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