If your Nebula Cosmos Laser 4K projector has no sound, you can try the following solutions to fix the problem.
1. Switch between various projection modes to see whether the Nebula Cosmos Laser 4K projector can play sound.
2. Press the Volume Up button on the top of your projector.
3. Restore the default settings of the projector: Go to Settings > Devices Preferences > Restart.
4. In Projection Mode, connect Nebula Cosmos Laser 4K projector to an external Bluetooth speaker. Go to Settings > Remotes & Accessories > Add Accessory.
That’s all for the no sound solutions for Nebula Cosmos Laser 4K projector.
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