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Quest2 thumbstick teardown and fix

the component that is so prone to failure on all vr controllers, apparently

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Any idea who makes these? Write it down in the comments!

The pots are about 10 kohm each, they are wired internally in parallel, and i got a reading of 4.7K on the connector.

I have not yet found, what company makes these, where to buy replacements, and what the part number is.  It seems, Nintendo Switch uses a very similar component, but its cable is different (has a 90-degree turn).

Just in case, when i first took it apart (2021-05-28), my 2-month-old quest2 had no drift problems yet. I was just curious, what thumbstick to look for, and what is the technology. Initially upon seeing it being different to one in RiftS, i hoped it's a capacitive or magnetic or optical... Unfortunately, it's just the usual potentiometer of questionable reliability.

  • oculus support: no pots for me

    DeepSOIC01/12/2022 at 22:28 0 comments

    I reached out to oculus support to buy some replacement tumbstick pots. The answer is:

    "... we don't sell or we don't have replacement for joystick part only. I would suggest you to send us your defective controller for us to review and check for it for a possible replacement."

    That's pretty unfortunate. I suppose, we won't see these joysticks on sale until it becomes clear they are a much needed consumable. Hoping for the best though, in spite of all this right-to-repair buzz getting traction.

    I also asked them, what is the part number - the support person could not find it out.

  • the most difficult fix ever

    DeepSOIC01/12/2022 at 00:25 0 comments

    potentiometers get bad in that the extra resistance between the wiper and the track gets very large and unstable. How can we counter that? well, connecting it to an amplifier with very high input impedance may help. So that's what i did.

    This is the original schematic:

    And this is my modification:

    I used an OPA2344 opamp, which is a rail-to-rail dual thing with cmos inputs. CMOS inputs have extremely low bias currents, making the circuit tolerate incredibly high source impedances. Any other rail-to-rail opamp with cmos/jfet inputs and working off of 2.7 volts should do.

    Here's how it looks:

    It was one of the most delicate pcb surgery i've ever done. Cutting, stripping and soldering to hair-thin pcb tracks is tricky. Note that there are a lot of mechanical parts right above the pcb, finding a place to put the amplifier so that it doesn't interfere took some effort.

    The thumbstick works perfectly now. But i have to admit, the thumbstick kinda fixed itself by when i took apart the controller to probe things. So, my fix might not be the fix. I'll report how it holds up.

    Update: as of 2022-04-06 (4 months since the mod), no issues.

    Update: 2022-04-11 i'm noticing that both left and right thumbsticks are slightly misbehaving. I'll let them get worse a bit...

  • problems begin - left thumbstick jitter

    DeepSOIC01/11/2022 at 17:23 0 comments

    8 month since i got quest2, i have noticeable gameplay problems due to bad left thumbstick. For example, in resident evil 4, i notice sometimes unexpectedly move backwards a bit. In calibration tool, i see the dot jumping downwards while i move it up. The overall behavior is very similar to this:

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James wrote 04/25/2022 at 19:00 point

Thank you for the post!  I hope to find more details soon.  I am having the same issues with the same stick.

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