The right Joy-Con of the Nintendo Switch repeatedly disconnects and reconnects after a few seconds when in handheld mode.
While all other functions boot and work normally, the right Joy-Con keeps cycling between disconnecting and reconnecting. Once connected, it stays active for a few seconds before dropping out again. The details are as follows:
-
The same issue occurs even when connecting another right Joy-Con.
-
The rails and rail connectors on the main console have been inspected and confirmed to be in good condition.
-
There are no issues at all when using the controller wirelessly.
-
In handheld mode, the connection drops briefly and reconnects randomly; it stays connected for anywhere from a few seconds to tens of seconds before dropping again.
-
Several components near the connector were replaced using parts from a donor board, but the symptoms remain the same.
-
The cooling fan is also working normally.
Which specific area should I focus on for further inspection?