Hardware Joy Con getting very hot

[Danster75]

I got a right joycon which behaves erratically;

while connected to the Switch it gets really hot after a few minutes, emitting a very soft hum.
I identified the rumble actuator as the source of the humming and the heat. Replaced the actuator
with a known good one thinking I solved the issue only to find that one also having the exact same
problem. On another Switch the results are the same.

So, the cause has to be isolated to the joycon itself and is not the actuator.

Has anyone got any clue as to what this cause could be?

 

[Hayato213]

Defective battery probably, probably should stop using that Joycon and just get a replacement one.

 

[Danster75]

Defective battery probably, probably should stop using that Joycon and just get a replacement one.

I’ll try a known good battery and report back.

 

[Danster75]

Tried a known good battery and the problem persists.
As a solution I disconnected the actuator so the joy-con can be used normally minus the rumble function of course.

 

[ghjfdtg]

The circuity controlling vibration is probably toast and keeps trying to drive the actuator which explains the humming and heat. Disconnecting it is a solution but more may break in the future. If you want rumble the only choice is a new Joy-Con or getting a working Joy-Con mainboard off eBay.

 

[Danster75]

Thanks for your reply.

You’re probably right.

However, I run a small repair business and that was not an option for me; repaircosts have to be at such a price that it is still interesting for the customer.
The initial complaint of a drifting analogue stick was easy and relatively cheap to fix and crucial for gameplay. Adding the cost of a working rumble function would drive the cost up too much.