Headphone CheckOne Earbud Not Working? How to Fix It
Quick answer: first confirm which side is silent with the test below. Then check the balance and mono-audio settings, clean the speaker mesh, clean the charging contacts and charge both earbuds in the case, and reset the earbuds. Those five steps fix most "dead" earbuds without a repair.
Wear both earbuds and press Left, then Right. Which one stays silent?
Volume around 50%.
First, what exactly is happening?
- One side is completely silent on the test and in every app: work through the list below in order.
- One side is quieter but not silent: it is almost always balance, earwax on the mesh or fit. Fixes 1–3.
- Both beeps come from both sides: that is mono audio, not a broken earbud. Fix 2.
- It works on the test but not in one app: the app or the content is at fault, not the earbuds.
- It only fails on one device: the problem is the pairing or that device's settings. Fixes 2 and 6.
10 fixes, from quickest to last resort
Check the balance slider
A balance slider pushed to one side makes the other earbud quiet or silent. iPhone: Settings → Accessibility → Audio & Visual → Balance. Android: Settings → Accessibility → Audio balance. Windows 11: Settings → System → Sound → your earbuds → Left/Right channel. Mac: System Settings → Sound → Output → Balance. Centre it.
Turn off mono audio
Mono audio sends the same sound to both sides, which hides channel problems and confuses tests. It lives in the same Accessibility menus as the balance slider. Switch it off and test again.
Clean the speaker mesh
Earwax on the small grille is the most common cause of a quiet earbud. Use a dry, soft toothbrush or a cotton swab, brush gently with the mesh facing down, and remove the ear tip to clean the nozzle. Do not push anything sharp into the mesh and do not use water.
Clean the charging contacts and charge both earbuds
A dead earbud is often simply a flat one: dirt on the small metal contacts stops it from charging in the case. Wipe the contacts on the earbud and inside the case with a dry swab (a little isopropyl alcohol for stubborn grime), put both buds back, and check that the case shows both charging. Leave them for 15 minutes.
Put both earbuds in the case and take them out together
True wireless earbuds have a primary bud that links to the phone and relays sound to the other one. Returning both to the case, closing the lid for 15 seconds and taking them out together re-establishes that link.
Forget and re-pair
Remove the earbuds from your device's Bluetooth list ("Forget this device"), then pair them again as new. This clears a corrupted pairing, a frequent cause of one bud connecting and the other not.
Reset the earbuds
A factory reset re-syncs the two buds with each other. AirPods: put both in the case, open the lid, press and hold the button on the back of the case for about 15 seconds until the light flashes amber, then white. Galaxy Buds: reset in the Galaxy Wearable app. Most other brands: hold the touch areas on both buds for 10–20 seconds while in the case; the exact gesture is in the maker's app or manual.
Check automatic ear detection and single-bud mode
Ear detection sensors can think a bud is out of your ear when it is in, especially with dirt on the sensor. Turn automatic ear detection off as a test (AirPods: Settings → [your AirPods] → Automatic Ear Detection). Some earbuds also let you pick which bud is the primary one or use a single bud; make sure that is not set.
Update the firmware
Firmware bugs that break one side are fixed regularly. AirPods update automatically while charging near your iPhone; most other brands update through their companion app.
Wired earphones: check the plug and cable
Rotate the plug slowly in the jack while playing the Left and Right test. If the missing side comes and goes, the jack is dirty or the plug is worn. Wiggle the cable near the plug and near the earpiece: a side that cuts in and out means a broken wire, which is a repair or a replacement. Try a different device to rule out the jack.
When it is time for a repair or warranty
If the earbud is charged, clean, reset and still silent on two different devices, the speaker or the battery has most likely failed. Most earbuds have a one- or two-year warranty; many makers also sell a single replacement earbud for less than a new pair. A swollen or very hot earbud should not be charged again.
Frequently asked questions
Why is only one AirPod working?
Usually the silent AirPod is flat or has dirty charging contacts. Clean the contacts, charge both in the case, then reset the AirPods by holding the case button for about 15 seconds. Also check the balance slider in Accessibility settings.
Why is my left earbud not working but the right one is?
On many earbuds the right bud is the primary one that connects to the phone, so a left bud that loses its link goes silent while the right keeps playing. Put both back in the case, close the lid, and take them out together; if that fails, reset them.
Can earwax make one earbud quieter?
Yes, and it is the most common cause. A thin layer on the mesh can cut the volume a lot, especially in the treble. Clean it gently with a dry soft brush.
How do I know if my earbud is broken or just not connected?
If the earbud is charged and the test above is silent on that side on two different phones or computers after a reset, it is most likely broken. If it works on one device but not another, it is a pairing or settings problem.