Introduction
The internal speakers inside of the Acer Chromebook CB315-3HT-C3FQ can only work when the diaphragms inside the speakers are able to vibrate without anything restricting their movement. If no other solutions to any sound problems are working, then that means that the diaphragms are blocked or damaged. Use this guide to get into the Chromebook and inspect the speakers.
Tools
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Use an iFixit opening tool to pry the bottom panel up and detach it from the rest of the Chromebook.
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Conclusion
To reassemble your device, follow these instructions in reverse order.