Hi,
I’m troubleshooting a MacBook Pro 16" A2485 (820-02382, M1 Max) on macOS (Tahoe). Headphones work fine (3.5mm jack + Bluetooth), but internal speakers do not work at all.

When I try to play any system sound (e.g. afplay /System/Library/Sounds/Glass.aiff), it fails with:
AudioQueueStart failed ('what')

Logs from coreaudiod show the Built-In Speaker device trying to start and then failing immediately, e.g.:
BuiltInSpeakerDevice: starting → IOA2UCDevice::StartIO ... Error: 0xE00002E9 → Underlying device failed to start with error: what
...

Hi,
I’m from Germany and fairly new to MacBook hardware repair. It started as a hobby and quickly turned into a serious interest. Looking forward to learning more and exchanging knowledge here.