1, it is normal that the lithium battery of the charging treasure is the same as that of the mobile phone, most of them are 3.7V, such a voltage is unable to charge the mobile phone, so the charging treasure will boost the voltage to about 5V, generally the coil (transformer or inductor) emits the sizing sound, if the function is normal when used, there is no problem.
2, the sound emitted by the filter capacitor, which shows that the capacitor is working in an abnormal state, a long time will occur leakage and loss of capacity, and even burst capacity, it is dangerous, it is best to replace. Maintenance method: 1, waterproof and moisture-proof. As an electronic product, accidentally entering water or being exposed to humid air when not used for a long time will cause varying degrees of corrosion or oxidation of its internal electronic components. 2. Anti-fall and anti-shock. The mobile phone charger is actually a fragile part, and the internal components can not withstand beating. In particular, it is necessary to prevent accidental landing during use. Do not drop, tap, or vibrate the charger. Handling the charger roughly will destroy the internal circuit board
3, anti-virulent chemicals. Do not use strong chemicals, cleaning agents, or strong detergents to clean the charger. To remove stains on the surface of the charger, you can scrub cotton with a small amount of anhydrous alcohol.
4. Discharge static electricity when cleaning. Clean the charger and charging port regularly. When cleaning, use a damp cloth, or an antistatic cloth. Do not use dry cloth (electrostatic charge).
5. Prevent cold and heat. Do not place the charger in a place where the temperature is too high. High temperatures can shorten the life of electronic devices, damage chargers, and deform or melt some plastic parts. Don't store your charger in a cold place either. When the charger works in a too cold environment, when the internal temperature rises, moisture will be formed in the charger and the circuit board will be destroyed.
Charger abnormal sound cause:
1, the charger ubs line aging.
2, charging head transformer, or internal small parts damaged.
3. The charging head is damaged by falling, colliding, and temperature.
Solutions:
1, the user telephone consultation customer service, and then go to the point of the network for mobile phone charging electrical inspection and maintenance.
2, if the charging head is sizzling because of the damage of the usb cable, then you can replace an original charging cable to continue to use
First, the sound emitted by the mobile phone when charging is the sound of current.