The situation when yours TWS-Xiaomi headphones suddenly stop charging inside the case, always catches you off guard. You open the lid, hoping to see the usual glow of the indicators, but instead - silence and LEDs that are gone. This is a common problem that can occur with both new models like Redmi Buds 4 Pro, and with the time-tested Mi True Wireless Earphones 2. Most often it is not a battery failure, but in banal interference or software failure.
In this article, we will discuss all possible causes of failure of charging in detail and propose specific steps to eliminate them. It is important for owners of Xiaomi gadgets to understand that the power system in compact cases is quite complex, and the slightest contamination can disrupt contact. We will consider both hardware problems and software failures that require user intervention.
Before you panic and bring the device to the service center, try to do the initial diagnosis yourself. In 80% of cases, the problem can be solved at home in 10-15 minutes without special tools, the main thing is to consistently eliminate all factors, from the simplest - contamination of contacts.
Mechanical pollution and contact oxidation
The most common, but most common, cause of non-charging is dirt, dust, or oxides on the contacts, and when you use metal pads inside the headphones and pins, the case accumulates earwax, skin fat, and dust, which conducts current poorly or does not conduct at all, creating an insulating film.
To fix the problem, you need to do a thorough cleaning. Use a cotton swab slightly soaked in isopropyl alcohol or a special electronics cleaner. Importantly, the alcohol should evaporate quickly, leaving no moisture inside the speaker. Carefully wipe the contacts on the headphones themselves and the response pins inside the case.
⚠️ Warning: Never use metal objects (needles, pins) to clean contacts, as you can close the chain or damage the coating, which will lead to irreversible corrosion.
After cleaning, allow the devices to dry for 5-10 minutes before inserting into the case. If the contacts have been severely oxidized, the procedure can be repeated 2-3 times. Often after such a simple manipulation, the indicators light up, confirming the restoration of normal current.
Problems with the cable and power supply
Sometimes the problem lies not in the headphones themselves, but in the power source. Cases for Xiaomi TWS are usually equipped with a Micro-USB or USB Type-C port. Cheap cables or low-current power supplies may not “wake up” the charge controller inside the case, especially if the battery of the case itself is discharged to zero.
Try replacing the cable with a known serviceable one and connecting the case to another power source, such as a computer port or other adapter. Current strength should be at least 1A (1000 mA). Using powerful fast charging units for phones can sometimes cause protocol conflicts, so it is better to use a standard USB 2.0 port.
- 🔌 Check the case charging port for pile and dust, gently cleaning it with a toothpick.
- 🔋 Use a cable no longer than 1 meter in length to avoid a voltage drop.
- ⚡ Try charging the case from the power bank to exclude instability of the home power grid.
If the indicator on the case lights up when you connect the cable, but the headphones inside do not charge, then the problem is the transfer of energy from the case to the "ears." If even the indicator of the case itself does not burn, the case battery or its power controller is probably defective.
Software failure and the need to reset
Xiaomi and Redmi’s electronics are controlled by microcontrollers that can go into a state of error (glitch), in which case the charge controller can “think” that the battery is full, or block the input current due to a false overheating signal or short circuit.
To fix this, you need to perform a full headphone reset. The procedure may vary depending on the model, but the overall algorithm is the same: You need to place the headphones in the case, open the lid, and pinch the touch areas or physical buttons on the headphone cases (or on the case) for 10-20 seconds.