If your OnePlus Open suddenly goes silent, it can be a real puzzle. Whether you're missing notification chimes, media playback is mute, or calls have no sound, the issue is often a simple setting or a temporary glitch. I'd start with the quick checks first, as they solve most problems in under a minute.
Check Your Volume and Sound Mode
First, press the volume up button on the side of your phone. If you see a volume slider on screen but hear nothing, the issue might be deeper. Pull down the quick settings panel from the top of your screen and make sure the sound mode isn't set to Silent or Vibrate. The icon looks like a speaker with a slash or a vibrating phone.
For more control, go into Settings > Sound & vibration. Here, you can adjust the media, ringtone, and alarm volumes individually. Sometimes an app's volume gets turned down independently, so play some music or a video and use the physical buttons to raise it.
Disconnect Bluetooth and Accessories
Your OnePlus Open might be trying to send audio to a paired device. Open the quick settings panel again and tap the Bluetooth icon to turn it off. If that doesn't work, go to Settings > Bluetooth and look at the list of connected devices.
Tap the settings icon next to any device and select "Disconnect." Also, remove any headphones or USB-C audio adapters. Even a case that isn't perfectly aligned can sometimes muffle the bottom-firing speaker on the Open.
Clean the Speaker Grilles
Dust and pocket lint love to collect in the small speaker grilles. The main speaker is on the bottom edge, and there's an earpiece speaker at the top of the outer display. Take a close look with a flashlight.
Use a soft, dry toothbrush or a clean, dry cotton swab to gently brush away any debris. Never use a pin or compressed air, as you could easily damage the delicate speaker components behind the grill. A little maintenance here can make a big difference in sound clarity.
Review Do Not Disturb and App-Specific Settings
Check if Do Not Disturb is active. Swipe down twice to open the full quick settings and look for the "Do Not Disturb" icon (a circle with a line through it). If it's on, tap it to turn it off. You can also go to Settings > Sound & vibration > Do Not Disturb to see its schedule and rules.
Some apps, like YouTube or Spotify, have their own in-app volume controls. Make sure sound isn't muted within the app you're using. Also, check Settings > Apps > [App Name] > Notifications to ensure that app is allowed to make sound.
Perform a Force Restart
A quick force restart clears out temporary software hiccups that can affect audio. Simply press and hold the Power button on the right side for about 10 seconds. Keep holding it until you feel a vibration and see the OnePlus logo appear on screen, then release.
This is different from a normal restart and doesn't erase any data. It's a great first step if the sound cut out suddenly after opening a specific app or folding the device.
Check for Software Updates
OnePlus frequently releases OxygenOS updates that include bug fixes. An update could resolve a known audio conflict. Go to Settings > About device > OxygenOS and tap on the top banner to check for an update.
If an update is available, it's best to install it while your phone is connected to Wi-Fi and has more than 50% battery, or is plugged into its included 67W SUPERVOOC charger.
Boot Into Safe Mode
If the sound works in Safe Mode, you know a third-party app you installed is the culprit. To enter Safe Mode, press and hold the Power button until the power menu appears. Then, tap and hold the "Power off" option on screen until a prompt asks if you want to reboot to Safe Mode. Tap "OK."
Your phone will restart with "Safe Mode" in the bottom corner. Test your sound now. To exit, just restart your phone normally. If sound works here, start uninstalling recently downloaded apps one by one until the problem stops.
Clear the Cache Partition
Corrupted system cache can cause all sorts of odd behavior, including audio problems. To clear it, power your OnePlus Open off completely. Then, press and hold the Volume Down button and the Power button together.
Hold them until the OnePlus logo appears, then release. You'll enter recovery mode. Use the volume buttons to navigate to "Wipe data and cache" and press the power button to select. Then choose "Wipe cache" and confirm. Finally, select "Reboot" to restart your phone.
Reset All Settings
This is a more thorough step if a specific setting is misconfigured. It will reset your Wi-Fi, Bluetooth, sound, and display settings back to default but won't touch your photos, apps, or personal files. Go to Settings > Additional settings > Back up and reset > Reset phone.
Choose "Reset all settings" and enter your lock screen password if prompted. After the phone reboots, you'll need to reconfigure your preferences, but it often resolves persistent glitches.
