You plug in your charger and hear a faint buzzing or humming sound from the adapter. Is it dangerous? Should you throw it away? The honest answer is: sometimes it is harmless, and sometimes it is a warning sign. Here is how to tell the difference.
A very quiet, high-pitched buzz is often "coil whine" — a normal sound made by the small coils inside the adapter vibrating as electricity passes through. It is common in fast chargers, especially when the phone is nearly full and the charger is switching power levels. If the sound is faint, the adapter stays cool, and the phone charges normally, it is usually safe.
But stop using the adapter immediately if you notice any of these danger signs: the adapter gets very hot to touch, you smell burning plastic, you see sparks or smoke, the buzzing is loud or crackling, or the adapter feels loose in the socket. These mean something inside is failing, and continuing to use it can damage your phone or even start a fire.
Never open a charger yourself — the capacitors inside can hold a dangerous charge even when unplugged. Instead, test with a different cable and a different socket first. A damaged cable can also cause buzzing. If the noise follows the adapter, replace it.
Always buy original or certified chargers from a trusted shop. Cheap unbranded adapters are the most common cause of buzzing, overheating and phone damage. A good charger costs less than a new phone — or a new battery.
If your phone itself makes a buzzing sound while charging, or the charging port feels hot, bring the phone to a repair shop for a check before the problem gets worse.
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