Hardware Joycon pin 5 stays high

ewabc886

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I have a joycon having pin5 staying at high when it's plugged into the switch.
I need to manually short it to ground to bring it to low, then the switch sounds "click", and the wired connection is done.
Once the joycon is disconnected, it goes to wireless mode.
When it's connected back, pin5 stays high again.

This joycon is left on the shelf for long time because of its broken connector.
I took it out for a repair a few days ago and successfully soldered the connector, with 2 soldering pads gone.
So the 2 pins (pin 3 and 10) were connected through a jump wire instead.

I have all test points and ground continuity tests passed. The connection seems to be fine.
I'm also quite sure that the switch's rail is fine because it can detect other joycons without issues.
Which part should I try to investigate?
Should the chip died somehow?
Is it possible for me to keep pin 5 shorted to ground to make this joycon work? Will this cause any further issues?
Thank you for all the ideas!
 
Last edited by ewabc886,
Lamcza

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ewabc886 said:
I have a joycon having pin5 staying at high when it's plugged into the switch.
I need to manually short it to ground to bring it to low, then the switch sounds "click", and the wired connection is done.
Once the joycon is disconnected, it goes to wireless mode.
When it's connected back, pin5 stays high again.

This joycon is left on the shelf for long time because of its broken connector.
I took it out for a repair a few days ago and successfully soldered the connector, with 2 soldering pads gone.
So the 2 pins (pin 3 and 10) were connected through a jump wire instead.

I have all test points and ground continuity tests passed. The connection seems to be fine.
I'm also quite sure that the switch's rail is fine because it can detect other joycons without issues.
Which part should I try to investigate?
Should the chip died somehow?
Is it possible for me to keep pin 5 shorted to ground to make this joycon work? Will this cause any further issues?
Thank you for all the ideas!
Click to expand...
what connector rail?
 
ewabc886

ewabc886

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Lamcza said:
what connector rail?
Click to expand...

To be precise, I replaced the connector at the upper left corner in the figure.
FCEB584F-5836-4D7C-8AD3-19584687C6F0.jpeg

Post automatically merged:

I also found that normal diode voltage from pin 5 to pin 6 should be 1.8V, same as the high state voltage.
But the malfunction board has diode voltage of 0V
Post automatically merged:

After a few hours of checking, it’s found that a 0201 10k Ohm resister connecting pin 5 to ground is ripped off.
Once it’s soldered with proper resister, the joycon works normally.
 
Last edited by ewabc886,

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