Hardware Joycons not charging when the switch is plugged in

[unclecracker]

I have a switch with very strange behavior. It was not charging the Joycons at all as i first got it. After reading a lot in the forums and doing some tracing of the 5v line from the Joycons I could track the issue to the fan which had a short. After replacing the fan everything seemed to work fine at first, Joycons were charging from the switch battery.

But as soon as I plug in the switch the Joycons stop charging. I left the switch charging over night, but still the same behavoir. As soon as I unplug the console the Joycons start charging again. The switch itself is charging fine.

Maybe anyone can point me in the right direction with this.

 

[unclecracker]

I could Track the fault back to the little PU Chip on the Backside of the Board. After swapping it from a donor Board I could get the Switch back to normal. Joycons now are charged as they should be. Maybe this helps If someone is facing simmilar issues.

 

[seidolino]

hi! I‘m having the same issue, I already tried switching the fan and the rails, but that didn‘t help. Can you please post an image of the PU Chip you‘re talking about? that would be great, thanks!

 

[seidolino]

I think I found the resbonsible parts in this post here -> https://www.tronicsfixforum.com/t/5v-boost-ic-chip/579/8

can anybody tell me how to check these parts from the images? in diode mode both? and on which contacts? and does anybody know the readings? thanks!

 

[seidolino]

In my case it wasn’t the chip labeled with „PU“, it was caused by this diode next to the fan FPC, which was causing a short on the 5V line.