Joy con doesnt work in handheld mode

[real atlas]

So after trying to repair my joycons, it doesn't work in handheld mode, so I wanted to know if anyone knew what part in the joy con affects that.

[noble atlas]

It appears that the console does not detect the joy cons when attached to it. You will need to ensure that your console has the latest system update and then restart the console. After that, remove the joy cons from the console, reset it, and attach them back to the console to see if it works.