Hardware Faulty joycon even after pcb change

[Elusivo]

Hi all,

My right joycon was going crazy, spamming button presses on its own randomly.

Initially I removed the PCB n resoldered some components with a hot air station just to see if I could solve anything before throwing it to the bin.
Not only it didn’t solve anything, but the joycom died completely.

So I decided to get a “new” PCB from AliExpress (which was pretty dumb as I could have gotten a used n complete joycon for about the same price), got the PCB yesterday, reassembled the joycon, n same thing, no leds, n the switch doesn’t detect the joycon when plugged into it.
Battery voltage was 3.3V, I left it on the switch over night n it now has 4.1V.

Any thoughts on what I should check further?
I either got a faulty pcb from AliExpres, or it’s some other component, which unfortunately I have no spares of to change...

What is the minimum amount of things that need to be connected to the pcb for it to work? Like shoulder button, ir camera, etc?

 

[impeeza]

the minimum is the PCB and the battery and the rail connector (if you never has paired the board to your switch)

 

[Elusivo]

the minimum is the PCB and the battery and the rail connector (if you never has paired the board to your switch)

Thanks, that's great, like that i can pretty much rule out pcb fault or not. Will check later.

 

[Elusivo]

So, i only disconnected the Zr flat cable n antenna, and it came back to life!!

Reconnected everything back n now it's working... i guess the Zr flat cable wasn't properly plugged in... the joycon worked after i disconnected it, looked to be properly seated tho ...
Switch gives me green joycon, now need recolor it back to the yellow neon.

I did try the old pcb again and yep, dead. Oh well xD happy now.