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Please try switching the playback source to play audio/video in MP3/MP4 format, check if there is sound,
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Disconnect the projector from the device and check if the device is muted.
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If you try these steps and still no sound, please reset the projector by long-pressing the OK button or unplug the power cable directly and power it on again after 1-2 hours, then check if it's normal.
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If the problem still persists, please be free to get back to us! It would be great if you could provide a video so we can help you further.
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