USB audio device not working after KB5083769 update – detected but no sound

Agnese Chiessi 20 Reputation points
2026-04-28T08:46:51.1033333+00:00

After installing the April 2026 security update KB5083769, my USB speaker bar (MZ-630) stopped producing audio. The device is detected correctly, set as default, green LED is on, but no sound comes out — not even during the Windows audio test.

The speaker works fine on another Windows PC, on a Mac, and on an Android smartphone, so the hardware is not the issue.

Troubleshooting already attempted:

Set as default device

Checked Volume Mixer

Restarted audio services (audiosrv, AudioEndpointBuilder, MMCSS)

Uninstalled and reinstalled driver

Ran Audio Troubleshooter

Tried different USB ports

Uninstalled KB5083769 and KB5082417

Changed audio format/sample rate

Disabled exclusive control

3.5mm jack audio works perfectly on the same PC.

Has anyone experienced the same issue after this update? Any fix available?

Windows for home | Windows 11 | Devices and drivers
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Answer accepted by question author
Hendrix-V 20,385 Reputation points Microsoft External Staff Moderator
2026-04-30T02:43:24.5766667+00:00

Hi Agnese Chiessi,

Since the speaker works on other devices and the 3.5 mm audio still works on this PC, this looks more like a USB audio driver assignment issue for this Windows installation rather than a problem with the speaker itself. Also, April 14, 2026—KB5083769 (OS Builds 26200.8246 and 26100.8246) does not currently list USB audio as a known issue, so the best next step is to focus on how Windows is binding the USB audio driver for this device.

Here are a few additional checks you can try step-by-step:

1, Remove hidden/old device entries

  • Disconnect the speaker.
  • Open Device Manager > View > Show hidden devices.
  • Remove any greyed-out entries for the speaker under Sound, video and game controllers, Audio inputs and outputs, and Universal Serial Bus controllers.
  • If prompted, do not select Delete the driver software for this device.

2, Install the device’s own driver first (if the manufacturer provides one)

  • Keep the speaker unplugged.
  • Download and install the latest driver or firmware package for the speaker from the manufacturer.
  • After installation finishes, reconnect the speaker.

3, Check Optional Updates and the PC maker’s support page

  • Go to Settings > Windows Update > Advanced options > Optional updates and install any available audio, chipset, or USB controller updates.
  • Also check your PC manufacturer’s website for the latest chipset / USB / audio drivers for your exact model.

If your PC is Intel-based, check whether the dTPM USB issue applies. Microsoft has documented a separate issue where some Intel 500/600/700-series systems with discrete TPM (dTPM) can have USB audio devices stop working or behave unexpectedly. If your system matches that hardware profile, the Microsoft article includes a specific workaround and validation steps.

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  1. Dmitry Pokrovsky 0 Reputation points
    2026-04-28T17:45:42.8366667+00:00

    I have quite similar issue but with Logitech Z407 and it has started since KB5079473 (March update). For me the workaround is rolling back the update. You may also try to roll it back since it should've been installed separately.

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  2. AI answer

    2026-04-28T08:47:18.4333333+00:00

    The behavior matches a known class of USB audio issues where the default USB Audio 2.0 driver and a device‑specific driver conflict, or where USB audio stops working after an update.

    Based on the available guidance, use these steps in order:

    1. Reinstall the USB audio device without deleting its driver
      1. Open Device Manager.
      2. Expand Sound, video and game controllers (and Audio inputs and outputs if applicable).
      3. Double‑click the USB speaker bar device.
      4. Go to the Driver tab.
      5. Select Uninstall Device.
      6. When prompted, do not select Delete the driver software for this device.
      7. Select Uninstall, then unplug and re‑plug the USB speaker bar.
      This forces Windows to re‑enumerate the device and can resolve the “detected but no sound” condition caused by a driver swap.
    2. Try a different USB port Connect the speaker bar to a different USB port on the same PC. The documented USB audio issue may not occur when the device is connected to another port.
    3. Install the device‑specific driver before connecting (if available) If the MZ‑630 has its own installer/driver package:
      1. Disconnect the USB speaker bar.
      2. Run the device’s installer and complete installation.
      3. After installation finishes, connect the USB speaker bar.
      This ensures Windows selects the device‑specific driver directly instead of first loading the generic USB Audio 2.0 driver and then replacing it.
    4. Confirm default output device and Windows Update status
      1. Go to Start > Settings > System > Sound.
      2. Under Output, select the USB speaker bar and confirm it is set as the default output device.
      3. Then go to Start > Settings > Windows Update and select Check for updates.
      4. Install all available updates (including any driver or optional updates) and restart the PC.
    5. If the driver still fails to start If the USB Audio 2.0 driver does not start correctly, collect audio logs and check the system event log for driver failures as described in the USB Audio 2.0 troubleshooting guidance. If the failure appears to be a driver problem introduced by KB5083769, report it with logs via Feedback Hub so it can be addressed in a future update.

    If none of these steps restore audio, the most likely cause is a regression in the USB audio stack or device‑specific driver triggered by the update. In that case, keeping the device on a different USB port and/or using the vendor’s driver installer (step 3) is the recommended workaround until an updated driver or cumulative update is released.

    References:

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